1
|
Singh P, Al Isawi WA, Zeller M, Mezei G. Conversion of Metal Pyrazolate/(Hydr)oxide Clusters into Nanojars: Solution vs Solid-State Structure and Magnetism. Inorg Chem 2024; 63:12290-12298. [PMID: 38874076 PMCID: PMC11220756 DOI: 10.1021/acs.inorgchem.4c01698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 05/31/2024] [Accepted: 06/05/2024] [Indexed: 06/15/2024]
Abstract
Nanojars are a class of anion binding and extraction agents composed of a series of [Cu(μ-OH)(μ-pz)]n (pz = pyrazolate; n = 26-36) supramolecular metal-organic complexes. In contrast to other anion binding agents amenable to liquid-liquid extraction, nanojars only form by self-assembly around the target anion, and guest-free nanojar hosts cannot be isolated. An extraordinary binding strength toward highly hydrophilic anions such as carbonate and sulfate was demonstrated by the inability of Ba2+ ions to precipitate the corresponding insoluble barium salts from nanojars. Herein, we provide an additional proof for the superior robustness of the nanojar framework based on competition experiments with other transition metal pyrazolate/(hydr)oxide complexes. In addition to the mass spectrometric characterization, we present variable-temperature nuclear magnetic resonance studies with an emphasis on the influence of the paramagnetic Cu2+ centers on 1H hyperfine shifts, along with X-ray crystallographic analysis of two polymorphs of (MePh3P)2[CO3⊂{Cu(OH)(pz)}27], including the highest (cubic) symmetry nanojar crystal lattice obtained to date as well as magnetism studies for the first time. Furthermore, we provide evidence for the first molybdate-incarcerating nanojars, [MoO4⊂{Cu(μ-OH)(μ-pz)}n]2- (n = 28, 31-33), formed by rearrangement from [MoVI8O12(μ-O)9(μ-pz)6(pzH)6·3pzH] in the presence of Cu2+ ions.
Collapse
Affiliation(s)
- Pooja Singh
- Department
of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, United States
| | - Wisam A. Al Isawi
- Department
of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, United States
| | - Matthias Zeller
- Department
of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Gellert Mezei
- Department
of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, United States
| |
Collapse
|
2
|
Luo XM, Li YK, Dong XY, Zang SQ. Platonic and Archimedean solids in discrete metal-containing clusters. Chem Soc Rev 2023; 52:383-444. [PMID: 36533405 DOI: 10.1039/d2cs00582d] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Metal-containing clusters have attracted increasing attention over the past 2-3 decades. This intense interest can be attributed to the fact that these discrete metal aggregates, whose atomically precise structures are resolved by single-crystal X-ray diffraction (SCXRD), often possess intriguing geometrical features (high symmetry, aesthetically pleasing shapes and architectures) and fascinating physical properties, providing invaluable opportunities for the intersection of different disciplines including chemistry, physics, mathematical geometry and materials science. In this review, we attempt to reinterpret and connect these fascinating clusters from the perspective of Platonic and Archimedean solid characteristics, focusing on highly symmetrical and complex metal-containing (metal = Al, Ti, V, Mo, W, U, Mn, Fe, Co, Ni, Pd, Pt, Cu, Ag, Au, lanthanoids (Ln), and actinoids) high-nuclearity clusters, including metal-oxo/hydroxide/chalcogenide clusters and metal clusters (with metal-metal binding) protected by surface organic ligands, such as thiolate, phosphine, alkynyl, carbonyl and nitrogen/oxygen donor ligands. Furthermore, we present the symmetrical beauty of metal cluster structures and the geometrical similarity of different types of clusters and provide a large number of examples to show how to accurately describe the metal clusters from the perspective of highly symmetrical polyhedra. Finally, knowledge and further insights into the design and synthesis of unknown metal clusters are put forward by summarizing these "star" molecules.
Collapse
Affiliation(s)
- Xi-Ming Luo
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Ya-Ke Li
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Xi-Yan Dong
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China. .,College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China
| | - Shuang-Quan Zang
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| |
Collapse
|
3
|
Herrera S, Rivero KI, Guzmán A, Cedeño J, Miksovska J, Raptis RG. Mononuclear, hexanuclear and polymeric indium(III) pyrazolido complexes; structural characterization, dynamic solution studies and luminescent properties. Dalton Trans 2022; 51:14277-14286. [PMID: 36069270 DOI: 10.1039/d2dt01901a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new family of six mononuclear indium(III) complexes of formula mer-[InIIICl3(pz*H)3]-pz*H = pyrazole (pzH), or substituted pyrazoles: 4-Cl-pzH, 4-Br-pzH, 4-I-pzH, 4-Ph-pzH and 3,5-Me2-pzH-were synthesized by addition reactions of InCl3 and pz*H and crystallographically characterized. The fluxional behaviour of the complexes, probed by variable temperature 1H NMR spectroscopy in the 328 K to 173 K range, was attributed to (at least) four simultaneous processes: pyrazole N-H proton dissociation/association, cis/trans-pyrazole exchange, and N1/N2 tautomerization of the cis- and of the trans-pyrazoles. Three novel trianionic hexanuclear complexes of general formula (pipH)3[In6Cl6(μ3-OH0.5)2(μ-OH)6(μ-pz*)6]-pz* = pz, 4-Cl-pz and 4-Ph-pz-showing μ-hydroxo and μ-oxo bridges were synthesized from the corresponding mer-[InIIICl3(pz*H)3] and characterized by single crystal X-ray diffraction and 1H NMR. Under different solvent conditions, multicolour emitting polymeric complexes of general formula [In(μ-pz*)3]n-pz* = pz, 4-Cl-pz, 4-I-pz and 4-Ph-pz-were obtained also from mer-[InIIICl3(pz*H)3] after addition of a base. Luminescence and lifetime calculations were performed for all polymers formed.
Collapse
Affiliation(s)
- Susana Herrera
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, FL 33199, USA.
| | - Kennett I Rivero
- Department of Chemistry, University of Puerto Rico, PR 00984, USA
| | - Alexis Guzmán
- Department of Chemistry, University of Puerto Rico, PR 00984, USA
| | - Jonathan Cedeño
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, FL 33199, USA.
| | - Jaroslava Miksovska
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, FL 33199, USA.
| | - Raphael G Raptis
- Department of Chemistry and Biochemistry and Biomolecular Sciences Institute, Florida International University, Miami, FL 33199, USA.
| |
Collapse
|
4
|
Gillen JH, Moore CA, Vuong M, Shajahan J, Anstey MR, Alston JR, Bejger CM. Synthesis and disassembly of an organometallic polymer comprising redox-active Co 4S 4 clusters and Janus biscarbene linkers. Chem Commun (Camb) 2022; 58:4885-4888. [PMID: 35352711 DOI: 10.1039/d2cc00953f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Here, we show for the first time that main-chain organometallic polymers (MCOPs) can be prepared from Janus N-heterocyclic carbene (NHC) linkers and polynuclear cluster nodes. The crosslinked framework Co4S4-MCOP is synthesized via ligand displacement reactions and undergoes reversible electron transfer in the solid state. Discrete molecular cluster species can be excised from the framework by digesting the solid in solutions of excess monocarbene. Finally, we demonstrate a synthetic route to monodisperse framework particles via coordination modulation.
Collapse
Affiliation(s)
- Jonathan H Gillen
- Department of Chemistry, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA.
| | - Connor A Moore
- Department of Chemistry, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA.
| | - My Vuong
- Department of Chemistry, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA.
| | - Juvairia Shajahan
- The Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University, Greensboro, NC 27401, USA
| | | | - Jeffrey R Alston
- The Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University, Greensboro, NC 27401, USA
| | - Christopher M Bejger
- Department of Chemistry, The University of North Carolina at Charlotte, Charlotte, NC 28223, USA.
| |
Collapse
|
5
|
Bigness A, Vaddypally S, Zdilla MJ, Mendoza-Cortes JL. Ubiquity of cubanes in bioinorganic relevant compounds. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
6
|
Vargaftik MN, Nefedov SE. Ligand Exchange and Pyrazole Deprotonation in the Reaction of Trinuclear Palladium(II) Acetate with Binuclear Zinc Pivalate Pyrazole Pyrazolate. RUSS J COORD CHEM+ 2021. [DOI: 10.1134/s1070328421100079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
7
|
Uvarova MA, Nefedov SE. Unusual Hexanuclear Fe(II, III) Pyrazole–Pyrazolate–Pivalate Formed upon η5,π-Bonding of Bridging Pyrazolate Anion to Potassium Cation. RUSS J COORD CHEM+ 2020. [DOI: 10.1134/s1070328420020074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
8
|
|
9
|
Lazarou KA, González-Nieves K, Chakraborty I, Raptis RG. Spontaneous Resolution by Crystallization of an Octanuclear Iron(III) Complex Using Only Racemic Reagents. Angew Chem Int Ed Engl 2019; 58:7324-7328. [PMID: 30891840 DOI: 10.1002/anie.201901877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 03/17/2019] [Indexed: 11/10/2022]
Abstract
The P and M enantiomers of the octanuclear [Fe8 (μ4 -O)4 (μ-4-Cl-pz)12 Cl4 ] complex, having T symmetry, were resolved by temporary substitution of chloride ligands by racemic 4-s Bu-phenolates and subsequent crystallization, where the (S)- and (R)-phenolates coordinate selectively to the M and P complexes, respectively. The complexes were characterized by circular dichroism analysis and X-ray structure determination. This work constitutes a rare example of enantiomeric recognition resulting in spontaneous resolution upon crystallization.
Collapse
Affiliation(s)
- Konstantinos A Lazarou
- Department of Chemistry and Biochemistry and the Biomolecular Sciences Institute, Florida International University, 11200 SW 8th Street, Miami, FL, 33199, USA
| | - Karilys González-Nieves
- Department of Natural Sciences, University of Puerto Rico at Carolina, PO Box 4800, Carolina, PR, 00984, USA
| | - Indranil Chakraborty
- Department of Chemistry and Biochemistry and the Biomolecular Sciences Institute, Florida International University, 11200 SW 8th Street, Miami, FL, 33199, USA
| | - Raphael G Raptis
- Department of Chemistry and Biochemistry and the Biomolecular Sciences Institute, Florida International University, 11200 SW 8th Street, Miami, FL, 33199, USA
| |
Collapse
|
10
|
Lazarou KA, González‐Nieves K, Chakraborty I, Raptis RG. Spontaneous Resolution by Crystallization of an Octanuclear Iron(III) Complex Using Only Racemic Reagents. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Konstantinos A. Lazarou
- Department of Chemistry and Biochemistry and the Biomolecular Sciences InstituteFlorida International University 11200 SW 8th Street Miami FL 33199 USA
| | - Karilys González‐Nieves
- Department of Natural SciencesUniversity of Puerto Rico at Carolina PO Box 4800 Carolina PR 00984 USA
| | - Indranil Chakraborty
- Department of Chemistry and Biochemistry and the Biomolecular Sciences InstituteFlorida International University 11200 SW 8th Street Miami FL 33199 USA
| | - Raphael G. Raptis
- Department of Chemistry and Biochemistry and the Biomolecular Sciences InstituteFlorida International University 11200 SW 8th Street Miami FL 33199 USA
| |
Collapse
|
11
|
Chang H, Kim BH, Jeong HY, Moon JH, Park M, Shin K, Chae SI, Lee J, Kang T, Choi BK, Yang J, Bootharaju MS, Song H, An SH, Park KM, Oh JY, Lee H, Kim MS, Park J, Hyeon T. Molecular-Level Understanding of Continuous Growth from Iron-Oxo Clusters to Iron Oxide Nanoparticles. J Am Chem Soc 2019; 141:7037-7045. [DOI: 10.1021/jacs.9b01670] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Hogeun Chang
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Byung Hyo Kim
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Hu Young Jeong
- UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
| | - Jeong Hee Moon
- Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Minwoo Park
- Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | - Kwangsoo Shin
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Sue In Chae
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Jisoo Lee
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Taegyu Kang
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Back Kyu Choi
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Jiwoong Yang
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Megalamane S. Bootharaju
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Hyoin Song
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Seong Hee An
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Kyung Man Park
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | | | - Hoonkyung Lee
- Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | - Myung Soo Kim
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Jungwon Park
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Taeghwan Hyeon
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
- School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| |
Collapse
|
12
|
Singh MK, Rajaraman G. Theoretical Studies on Hexanuclear [M 3(μ 3-O/OH)] 2 (M = Fe(III), Mn(III), and Ni(II)) Clusters: Magnetic Exchange, Magnetic Anisotropy, and Magneto-Structural Correlations. Inorg Chem 2019; 58:3175-3188. [PMID: 30741554 DOI: 10.1021/acs.inorgchem.8b03257] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Controlling spin Hamiltonian parameters such as magnetic exchange and magnetic anisotropy of polynuclear clusters is of great interest in the area of single molecule magnets (SMMs). Among large polynuclear clusters, hexanuclear clusters offer the best compromise in terms of size as they are often rigid, solution stable, and chemically amenable. The {M6O2} core is one of the common architectures known for many hexanuclear clusters and generally reported to possess a diamagnetic ST = 0 spin ground state, barring a few exceptions. In these clusters, there are several open questions that are poorly understood: (a) What controls the nature of magnetic exchange, which in turn dictates the ground state spin values? (b) For clusters possessing a nonzero spin ground state, what dictates the magnetic anisotropy? Here, using density functional methods, we have attempted to shed light on these two question by evaluating the exchange coupling constants in [Fe6IIIO2(OH)2{(C4N2H2SMe)2C(OH)O}2( tBuCO2)10] (1), [Fe6III(O)2(O2CH2)(O2CCH2 tBu)12(py)2] (2), [Fe6III(O2)(O)2(O2CCMe3)12(py)2] (3), [FeIII6O3(O2CMe)9(OEt)2(bpy)2]ClO4 (4), [MnIII6O2(O2CH2)(O2CPe t)11(HO2CPe t)2(O2CMe)] (5), and [NiII6(OH)4(O2C tBu)8( tBuCO2H)4] (6) complexes. We have estimated all the eight near-neighbor exchange coupling constants in these clusters. Our calculations not only agree with the experimental results but also offer insight on the origin of the spin ground state. Extensive magneto-structural correlations developed by varying M-O-M angles and M-O distances reveal that J values are extremely sensitive to small structural distortions. Correlations developed indicate that both the parameters are important for Fe(III), but for Mn(III) and Ni(II), the angles were found to play a dominant role. Quite interestingly, the computed zero-field splitting parameter D S=5 of complex 1 reveals that the exchange contribution to the anisotropy controls the sign of the ground state D value-an observation which differs from the general perception that the ground state D is controlled by the single-ion zero-field splitting parameter.
Collapse
Affiliation(s)
- Mukesh Kumar Singh
- Department of Chemistry , Indian Institute of Technology Bombay , Powai, Mumbai , Maharashtra , India - 400076
| | - Gopalan Rajaraman
- Department of Chemistry , Indian Institute of Technology Bombay , Powai, Mumbai , Maharashtra , India - 400076
| |
Collapse
|
13
|
Deutscher J, Corona T, Warm K, Engelmann X, Sobottka S, Braun‐Cula B, Sarkar B, Ray K. Water Oxidation Reaction Mediated by an Octanuclear Iron‐Oxo Cluster. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800269] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jennifer Deutscher
- Department of Chemistry Humboldt Universität zu Berlin Brook‐Taylor‐Strasse 2 12489 Berlin Germany
| | - Teresa Corona
- Department of Chemistry Humboldt Universität zu Berlin Brook‐Taylor‐Strasse 2 12489 Berlin Germany
| | - Katrin Warm
- Department of Chemistry Humboldt Universität zu Berlin Brook‐Taylor‐Strasse 2 12489 Berlin Germany
| | - Xenia Engelmann
- Department of Chemistry Humboldt Universität zu Berlin Brook‐Taylor‐Strasse 2 12489 Berlin Germany
| | - Sebastian Sobottka
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstrasse 34‐36 14195 Berlin Germany
| | - Beatrice Braun‐Cula
- Department of Chemistry Humboldt Universität zu Berlin Brook‐Taylor‐Strasse 2 12489 Berlin Germany
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie Anorganische Chemie Freie Universität Berlin Fabeckstrasse 34‐36 14195 Berlin Germany
| | - Kallol Ray
- Department of Chemistry Humboldt Universität zu Berlin Brook‐Taylor‐Strasse 2 12489 Berlin Germany
| |
Collapse
|
14
|
Magnetic resonance imaging contrast enhancement in vitro and in vivo by octanuclear iron-oxo cluster-based agents. J Inorg Biochem 2018; 186:176-186. [PMID: 29957454 PMCID: PMC6943819 DOI: 10.1016/j.jinorgbio.2018.06.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Revised: 05/24/2018] [Accepted: 06/09/2018] [Indexed: 02/03/2023]
Abstract
A water-soluble octanuclear cluster, [Fe8], was studied with regard to its properties as a potential contrast enhancing agent in magnetic resonance imaging (MRI) in magnetic fields of 1.3, 7.2 and 11.9 T and was shown to have transverse relaxivities r2 = 4.01, 10.09 and 15.83 mM s-1, respectively. A related hydrophobic [Fe8] cluster conjugated with 5 kDa hyaluronic acid (HA) was characterized by 57Fe-Mössbauer and MALDI-TOF mass spectroscopy, and was evaluated in aqueous solutions in vitro with regard to its contrast enhancing properties [r2 = 3.65 mM s-1 (1.3 T), 26.20 mM s-1 (7.2 T) and 52.18 mM s-1 (11.9 T)], its in vitro cellular cytotoxicity towards A-549 cells and COS-7 cells and its in vivo enhancement of T2-weighted images (4.7 T) of a human breast cancer xenografted on a nude mouse. The physiologically compatible [Fe8]-HA conjugate was i.v. injected to the tumor-bearing mouse, resulting in observable, heterogeneous signal change within the tumor, evident 15 min after injection and persisting for approximately 30 min. Both molecular [Fe8] and its HA-conjugate show a strong magnetic field dependence on r2, rendering them promising platforms for the further development of T2 MRI contrast agents in high and ultrahigh magnetic fields.
Collapse
|
15
|
Pinkard A, Champsaur AM, Roy X. Molecular Clusters: Nanoscale Building Blocks for Solid-State Materials. Acc Chem Res 2018; 51:919-929. [PMID: 29605996 DOI: 10.1021/acs.accounts.8b00016] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The programmed assembly of nanoscale building blocks into multicomponent hierarchical structures is a powerful strategy for the bottom-up construction of functional materials. To develop this concept, our team has explored the use of molecular clusters as superatomic building blocks to fabricate new classes of materials. The library of molecular clusters is rich with exciting properties, including diverse functionalization, redox activity, and magnetic ordering, so the resulting cluster-assembled solids, which we term superatomic crystals (SACs), hold the promise of high tunability, atomic precision, and robust architectures among a diverse range of other material properties. Molecular clusters have only seldom been used as precursors for functional materials. Our team has been at the forefront of new developments in this exciting research area, and this Account focuses on our progress toward designing materials from cluster-based precursors. In particular, this Account discusses (1) the design and synthesis of molecular cluster superatomic building blocks, (2) their self-assembly into SACs, and (3) their resulting collective properties. The set of molecular clusters discussed herein is diverse, with different cluster cores and ligand arrangements to create an impressive array of solids. The cluster cores include octahedral M6E8 and cubane M4E4 (M = metal; E = chalcogen), which are typically passivated by a shell of supporting ligands, a feature upon which we have expanded upon by designing and synthesizing more exotic ligands that can be used to direct solid-state assembly. Building from this library, we have designed whole families of binary SACs where the building blocks are held together through electrostatic, covalent, or van der Waals interactions. Using single-crystal X-ray diffraction (SCXRD) to determine the atomic structure, a remarkable range of compositional variability is accessible. We can also use this technique, in tandem with vibrational spectroscopy, to ascertain features about the constituent superatomic building blocks, such as the charge of the cluster cores, by analysis of bond distances from the SCXRD data. The combination of atomic precision and intercluster interactions in these SACs produces novel collective properties, including tunable electrical transport, crystalline thermal conductivity, and ferromagnetism. In addition, we have developed a synthetic strategy to insert redox-active guests into the superstructure of SACs via single-crystal-to-single-crystal intercalation. This intercalation process allows us to tune the optical and electrical transport properties of the superatomic crystal host. These properties are explored using a host of techniques, including Raman spectroscopy, SQUID magnetometry, electrical transport measurements, electronic absorption spectroscopy, differential scanning calorimetry, and frequency-domain thermoreflectance. Superatomic crystals have proven to be both robust and tunable, representing a new method of materials design and architecture. This Account demonstrates how precisely controlling the structure and properties of nanoscale building blocks is key in developing the next generation of functional materials; several examples are discussed and detailed herein.
Collapse
Affiliation(s)
- Andrew Pinkard
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Anouck M. Champsaur
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Xavier Roy
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| |
Collapse
|
16
|
Gajewska MJ, Bieńko A, Herchel R, Haukka M, Jerzykiewicz M, Ożarowski A, Drabent K, Hung CH. Iron(iii) bis(pyrazol-1-yl)acetate based decanuclear metallacycles: synthesis, structure, magnetic properties and DFT calculations. Dalton Trans 2018; 45:15089-15096. [PMID: 27722574 DOI: 10.1039/c6dt02333a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis, structural aspects, magnetic interpretation and theoretical rationalizations for a new member of the ferric wheel family, a decanuclear iron(iii) complex with the formula [Fe10(bdtbpza)10(μ2-OCH3)20] (1), featuring the N,N,O tridentate bis(3,5-di-tert-butylpyrazol-1-yl)acetate ligand, are reported. The influence of the steric effect on both the core geometry and coordination mode is observed. Temperature dependent (2.0-300 K range) magnetic susceptibility studies carried out on complexes 1 established unequivocally antiferromagnetic (AF) interactions between high-spin iron(iii) centers (S = 5/2), leading to a ground state S = 0. The mechanism of AF intramolecular coupling was proved using a broken-symmetry approach within the density functional method at the B3LYP/def2-TZVP(-f)/def2-SVP level of theory.
Collapse
Affiliation(s)
| | - Alina Bieńko
- Faculty of Chemistry, Wrocław University, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Radovan Herchel
- Regional Centre of Advanced Technologies and Materials & Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 771 46 Olomouc, Czech Republic.
| | - Matti Haukka
- Department of Chemistry, FI-40014 University of Jyväskylä, Finland
| | - Maria Jerzykiewicz
- Faculty of Chemistry, Wrocław University, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Andrzej Ożarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | - Krzysztof Drabent
- Faculty of Chemistry, Wrocław University, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Chen-Hsiung Hung
- Institute of Chemistry, Academia Sinica, Nankang, Taipei 105, Taiwan.
| |
Collapse
|
17
|
Trinh MT, Pinkard A, Pun AB, Sanders SN, Kumarasamy E, Sfeir MY, Campos LM, Roy X, Zhu XY. Distinct properties of the triplet pair state from singlet fission. SCIENCE ADVANCES 2017; 3:e1700241. [PMID: 28740866 PMCID: PMC5510972 DOI: 10.1126/sciadv.1700241] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 05/25/2017] [Indexed: 05/12/2023]
Abstract
Singlet fission, the conversion of a singlet exciton (S1) to two triplets (2 × T1), may increase the solar energy conversion efficiency beyond the Shockley-Queisser limit. This process is believed to involve the correlated triplet pair state 1(TT). Despite extensive research, the nature of the 1(TT) state and its spectroscopic signature remain actively debated. We use an end-connected pentacene dimer (BP0) as a model system and show evidence for a tightly bound 1(TT) state. It is characterized in the near-infrared (IR) region (~1.0 eV) by a distinct excited-state absorption (ESA) spectral feature, which closely resembles that of the S1 state; both show vibronic progressions of the aromatic ring breathing mode. We assign these near-IR spectra to 1(TT)→Sn and S1→Sn' transitions; Sn and Sn' likely come from the antisymmetric and symmetric linear combinations, respectively, of the S2 state localized on each pentacene unit in the dimer molecule. The 1(TT)→Sn transition is an indicator of the intertriplet electronic coupling strength, because inserting a phenylene spacer or twisting the dihedral angle between the two pentacene chromophores decreases the intertriplet electronic coupling and diminishes this ESA peak. In addition to spectroscopic signature, the tightly bound 1(TT) state also shows chemical reactivity that is distinctively different from that of an individual T1 state. Using an electron-accepting iron oxide molecular cluster [Fe8O4] linked to the pentacene or pentacene dimer (BP0), we show that electron transfer to the cluster occurs efficiently from an individual T1 in pentacene but not from the tightly bound 1(TT) state. Thus, reducing intertriplet electronic coupling in 1(TT) via molecular design might be necessary for the efficient harvesting of triplets from intramolecular singlet fission.
Collapse
Affiliation(s)
- M. Tuan Trinh
- Department of Chemistry, Columbia University, New York, NY 10027, USA
| | - Andrew Pinkard
- Department of Chemistry, Columbia University, New York, NY 10027, USA
| | - Andrew B. Pun
- Department of Chemistry, Columbia University, New York, NY 10027, USA
| | - Samuel N. Sanders
- Department of Chemistry, Columbia University, New York, NY 10027, USA
| | - Elango Kumarasamy
- Department of Chemistry, Columbia University, New York, NY 10027, USA
| | - Matthew Y. Sfeir
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Luis M. Campos
- Department of Chemistry, Columbia University, New York, NY 10027, USA
| | - Xavier Roy
- Department of Chemistry, Columbia University, New York, NY 10027, USA
| | - X.-Y. Zhu
- Department of Chemistry, Columbia University, New York, NY 10027, USA
| |
Collapse
|
18
|
Govor EV, Sanakis Y, Raptis RG. Synthesis of pyrazole (hemi)aminals via the cleavage of saturated aliphatic ether C–O bonds in the presence of ferric halides. NEW J CHEM 2017. [DOI: 10.1039/c6nj03822k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The discovery of reactions utilizing previously considered inert functional groups opens up new paths towards the synthesis of desired products.
Collapse
Affiliation(s)
- Evgen V. Govor
- Department of Chemistry and Biochemistry and the Biomolecular Sciences Institute
- Florida International University
- Miami
- USA
| | - Yiannis Sanakis
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- Athens
- Greece
| | - Raphael G. Raptis
- Department of Chemistry and Biochemistry and the Biomolecular Sciences Institute
- Florida International University
- Miami
- USA
| |
Collapse
|
19
|
Palii A, Aldoshin S, Tsukerblat B, Clemente-Juan JM, Gaita-Ariño A, Coronado E. Electric field controllable magnetic coupling of localized spins mediated by itinerant electrons: a toy model. Phys Chem Chem Phys 2017; 19:26098-26106. [DOI: 10.1039/c7cp03872k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
In this paper, we propose a toy model to describe the magnetic coupling between the localized spins mediated by the itinerant electron in partially delocalized mixed-valence (MV) systems.
Collapse
Affiliation(s)
- Andrew Palii
- Institute of Problems of Chemical Physics
- Chernogolovka
- Russia
- Institute of Applied Physics
- Academy of Sciences of Moldova
| | - Sergey Aldoshin
- Institute of Problems of Chemical Physics
- Chernogolovka
- Russia
| | - Boris Tsukerblat
- Department of Chemistry
- Ben-Gurion University of the Negev
- Beer-Sheva 84105
- Israel
| | | | | | - Eugenio Coronado
- Instituto de Ciencia Molecular
- Universidad de Valencia
- 46980 Paterna
- Spain
| |
Collapse
|
20
|
Ahmed BM, Zhang H, Mo Y, Mezei G. Drastic Deprotonation Reactivity Difference of 3- and 5-Alkylpyrazole Isomers, Their I2-Catalyzed Thermal Isomerization, and Telescoping Synthesis of 3,5-Dialkylpyrazoles: The “Adjacent Lone Pair Effect” Demystified. J Org Chem 2016; 81:1718-22. [DOI: 10.1021/acs.joc.5b02746] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Basil M. Ahmed
- Department
of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008-5413, United States
| | - Huaiyu Zhang
- Department
of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008-5413, United States
| | - Yirong Mo
- Department
of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008-5413, United States
| | - Gellert Mezei
- Department
of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008-5413, United States
| |
Collapse
|
21
|
Lichtenberg C, Garcia Rubio I, Viciu L, Adelhardt M, Meyer K, Jeschke G, Grützmacher H. A Low-Valent Iron Imido Heterocubane Cluster: Reversible Electron Transfer and Catalysis of Selective C-C Couplings. Angew Chem Int Ed Engl 2015; 54:13012-7. [PMID: 26480334 DOI: 10.1002/anie.201505668] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 07/20/2015] [Indexed: 11/11/2022]
Abstract
Enzymes and cofactors with iron-sulfur heterocubane core structures, [Fe4 S4 ], are often found in nature as electron transfer reagents in fundamental catalytic transformations. An artificial heterocubane with a [Fe4 N4 ] core is reported that can reversibly store up to four electrons at very negative potentials. The neutral [Fe4 N4 ] and the singly reduced low-valent [Fe4 N4 ](-) heterocubanes were isolated and fully characterized. The low-valent species bears one unpaired electron, which is localized predominantly at one iron center in the electronic ground state but fluctuates with increasing temperatures. The electrons stored or released by the [Fe4 N4 ]/[Fe4 N4 ](-) redox couple can be used in reductive or oxidative CC couplings and even allow catalytic one-pot reactions, which show a remarkably enhanced selectivity in the presence of the [Fe4 N4 ] heterocubanes.
Collapse
Affiliation(s)
- Crispin Lichtenberg
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich (Switzerland)
| | - Inés Garcia Rubio
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich (Switzerland).,Current address: Centro Universitario de la Defensa, Academia General Militar, Crta. de Huesca s/n, Zaragoza, 50090 (Spain)
| | - Liliana Viciu
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich (Switzerland)
| | - Mario Adelhardt
- Department of Chemistry & Pharmacy, Friedrich-Alexander University, Erlangen-Nürnberg (FAU), Egerlandstrasse 1, 91058 Erlangen (Germany)
| | - Karsten Meyer
- Department of Chemistry & Pharmacy, Friedrich-Alexander University, Erlangen-Nürnberg (FAU), Egerlandstrasse 1, 91058 Erlangen (Germany)
| | - Gunnar Jeschke
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich (Switzerland)
| | - Hansjörg Grützmacher
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich (Switzerland).
| |
Collapse
|
22
|
Lichtenberg C, Garcia Rubio I, Viciu L, Adelhardt M, Meyer K, Jeschke G, Grützmacher H. A Low-Valent Iron Imido Heterocubane Cluster: Reversible Electron Transfer and Catalysis of Selective C-C Couplings. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505668] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
23
|
Herchel R, Nemec I, Machata M, Trávníček Z. Experimental and Theoretical Investigations of Magnetic Exchange Pathways in Structurally Diverse Iron(III) Schiff-Base Complexes. Inorg Chem 2015; 54:8625-38. [DOI: 10.1021/acs.inorgchem.5b01271] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Radovan Herchel
- Regional Centre of Advanced Technologies and Materials,
Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic
| | - Ivan Nemec
- Regional Centre of Advanced Technologies and Materials,
Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic
| | - Marek Machata
- Regional Centre of Advanced Technologies and Materials,
Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic
| | - Zdeněk Trávníček
- Regional Centre of Advanced Technologies and Materials,
Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic
| |
Collapse
|
24
|
Gu X, Jiang G, Jiang G, Chen T, Zhan W, Li X, Wu S, Tian S. Detection of dopamine on a mercapto-terminated hexanuclear Fe(III) cluster modified gold electrode. Talanta 2015; 137:189-96. [DOI: 10.1016/j.talanta.2015.01.034] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 01/21/2015] [Accepted: 01/25/2015] [Indexed: 10/24/2022]
|
25
|
Cao XY, Hubbard JW, Guerrero-Medina J, Hernández-Maldonado AJ, Mathivathanan L, Rinaldi C, Sanakis Y, Raptis RG. Spin-glass behavior of a hierarchically-organized, hybrid microporous material, based on an extended framework of octanuclear iron-oxo units. Dalton Trans 2015; 44:3399-409. [PMID: 25601767 DOI: 10.1039/c4dt02606c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Inspired by the stepwise addition of octanuclear iron units into mammalian ferritin, a "stop-and-go" synthesis strategy was used to prepare two microporous (Langmuir surface area, 490 m(2) g(-1); effective pore size, 4-5 Å) hierarchical materials {[Fe8(μ4-O)4(μ-pz)12Cl0.3(μ-O)1.85}n () and {[Fe8(μ4-O)4(μ-4-Me-pz)12Cl0.4(μ-O)1.8}n (), which are new members of the EO2 family of polymeric materials (E = C, Si and Ge). The secondary building units (SBUs) E = [Fe8(μ4-O)4(μ-4-R-pz)12] (Fe8) are nanoscale pseudo-spherical clusters, rather than single atoms, forming μ-oxo Fe-O-Fe linkages between Fe8-SBUs. The characteristic Fe-O-Fe asymmetric stretching mode in the infrared (IR) spectra of these compounds appearing at around 800 cm(-1) suggest the formation of approximately linear μ-oxo Fe-O-Fe linkages between Fe8-SBUs in and . We employ the concept of continuous random network (CRN) to describe for the first time the framework features of a Fe8-based amorphous materials, in which the average connecting numbers of each Fe8-cluster are ∼3.7 and ∼3.6 for and , respectively. (57)Fe-Mössbauer spectroscopic analysis provides insights to the intercluster connectivity of and on one hand and to their magnetic properties on the other, evident by a magnetic split sextet below 30 K. The combination of Mössbauer spectroscopy and magnetism measurements reveals a spin-glass behavior with Tg of ∼30 K. The hierarchical porous materials and straddle the gap between metal oxides and metal-organic frameworks (MOFs). This study may open an alternative way for the development of multifunctional materials based on high nuclearity metal clusters.
Collapse
Affiliation(s)
- Xin-Yi Cao
- Department of Chemistry and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00936-8377, USA
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Ju M, Lv J, Kuang XY, Ding LP, Lu C, Wang JJ, Jin YY, Maroulis G. Systematic theoretical investigation of geometries, stabilities and magnetic properties of iron oxide clusters (FeO)nμ(n = 1–8, μ = 0, ±1): insights and perspectives. RSC Adv 2015. [DOI: 10.1039/c4ra12259c] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The structural and magnetic properties of neutral and charged (FeO)nμ(n= 1–8,μ= 0, ±1) clusters have been studied using an unbiased CALYPSO structure searching method.
Collapse
Affiliation(s)
- Meng Ju
- Institute of Atomic and Molecular Physics
- Sichuan University
- Chengdu 610065
- China
| | - Jian Lv
- Beijing Computational Science Research Center
- Beijing 100084
- China
- State Key Laboratory of Superhard Materials
- Jilin University
| | - Xiao-Yu Kuang
- Institute of Atomic and Molecular Physics
- Sichuan University
- Chengdu 610065
- China
| | - Li-Ping Ding
- Institute of Atomic and Molecular Physics
- Sichuan University
- Chengdu 610065
- China
| | - Cheng Lu
- Department of Physics
- Nanyang Normal University
- Nanyang 473061
- China
| | - Jing-Jing Wang
- Institute of Atomic and Molecular Physics
- Sichuan University
- Chengdu 610065
- China
| | - Yuan-Yuan Jin
- Institute of Atomic and Molecular Physics
- Sichuan University
- Chengdu 610065
- China
| | - George Maroulis
- Department of Chemistry
- University of Patras
- GR-26500 Patras
- Greece
| |
Collapse
|
27
|
Honarmand Ebrahimi K, Hagedoorn PL, Hagen WR. Unity in the Biochemistry of the Iron-Storage Proteins Ferritin and Bacterioferritin. Chem Rev 2014; 115:295-326. [DOI: 10.1021/cr5004908] [Citation(s) in RCA: 160] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Kourosh Honarmand Ebrahimi
- Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628
BC Delft, The Netherlands
| | - Peter-Leon Hagedoorn
- Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628
BC Delft, The Netherlands
| | - Wilfred R. Hagen
- Department of Biotechnology, Delft University of Technology, Julianalaan 67, 2628
BC Delft, The Netherlands
| |
Collapse
|
28
|
Turkiewicz A, Paley DW, Besara T, Elbaz G, Pinkard A, Siegrist T, Roy X. Assembling Hierarchical Cluster Solids with Atomic Precision. J Am Chem Soc 2014; 136:15873-6. [DOI: 10.1021/ja508698w] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Ari Turkiewicz
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| | - Daniel W. Paley
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| | - Tiglet Besara
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Giselle Elbaz
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| | - Andrew Pinkard
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| | - Theo Siegrist
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
- Department
of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida 32310, United States
| | - Xavier Roy
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| |
Collapse
|
29
|
Zueva EM, Herchel R, Borshch SA, Govor EV, Sameera WMC, McDonald R, Singleton J, Krzystek J, Trávníček Z, Sanakis Y, McGrady JE, Raptis RG. Double exchange in a mixed-valent octanuclear iron cluster, [Fe8(μ4-O)4(μ-4-Cl-pz)12Cl4]−. Dalton Trans 2014; 43:11269-76. [DOI: 10.1039/c4dt00020j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The influence of double exchange on the magnetic properties of a mixed-valent Fe4O8 cluster is highly dependent on temperature.
Collapse
Affiliation(s)
- Ekaterina M. Zueva
- Department of Chemistry
- Inorganic Chemistry Laboratory
- University of Oxford
- Oxford, UK
- Department of Inorganic Chemistry
| | - Radovan Herchel
- Regional Centre of Advanced Technologies and Materials
- Department of Inorganic Chemistry
- Faculty of Science
- Palacký University
- CZ-771 46 Olomouc, Czech Republic
| | - Serguei A. Borshch
- Laboratoire de Chimie
- UMR 5182
- Ecole Normale Supérieure de Lyon
- 69364 Lyon Cedex 07, France
| | - Evgen V. Govor
- Department of Chemistry and the Institute for Functional Nanomaterials
- University of Puerto Rico
- San Juan, USA
| | - W. M. C. Sameera
- Department of Chemistry
- Inorganic Chemistry Laboratory
- University of Oxford
- Oxford, UK
| | - Ross McDonald
- National High Magnetic Field Laboratory
- Los Alamos National Laboratories
- Los Alamos, USA
| | - John Singleton
- National High Magnetic Field Laboratory
- Los Alamos National Laboratories
- Los Alamos, USA
| | | | - Zdeněk Trávníček
- Regional Centre of Advanced Technologies and Materials
- Department of Inorganic Chemistry
- Faculty of Science
- Palacký University
- CZ-771 46 Olomouc, Czech Republic
| | - Yiannis Sanakis
- Institute of Materials Science
- NCRS “Demokritos”
- Athens, Greece
| | - John E. McGrady
- Department of Chemistry
- Inorganic Chemistry Laboratory
- University of Oxford
- Oxford, UK
| | - Raphael G. Raptis
- Department of Chemistry and the Institute for Functional Nanomaterials
- University of Puerto Rico
- San Juan, USA
| |
Collapse
|
30
|
Lalli D, Turano P. Solution and solid state NMR approaches to draw iron pathways in the ferritin nanocage. Acc Chem Res 2013; 46:2676-85. [PMID: 24000809 DOI: 10.1021/ar4000983] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Ferritins are intracellular proteins that can store thousands of iron(III) ions as a solid mineral. These structures autoassemble from four-helix bundle subunits to form a hollow sphere and are a prototypical example of protein nanocages. The protein acts as a reservoir, encapsulating iron as ferric oxide in its central cavity in a nontoxic and bioavailable form. Scientists have long known the structural details of the protein shell, owing to very high resolution X-ray structures of the apoform. However, the atomic level mechanism governing the multistep biomineralization process remained largely elusive. Through analysis of the chemical behavior of ferritin mutants, chemists have found the role of some residues in key reaction steps. Using Mössbauer and XAS, they have identified some di-iron intermediates of the catalytic reaction trapped by rapid freeze quench. However, structural information about the iron interaction sites remains scarce. The entire process is governed by a number of specific, but weak, interactions between the protein shell and the iron species moving across the cage. While this situation may constitute a major problem for crystallography, NMR spectroscopy represents an optimal tool to detect and characterize transient species involving soluble proteins. Regardless, NMR analysis of the 480 kDa ferritin represents a real challenge. Our interest in ferritin chemistry inspired us to use an original combination of solution and solid state approaches. While the highly symmetric structure of the homo-24-mer frog ferritin greatly simplifies the spectra, the large protein size hinders the efficient coherence transfer in solution, thus preventing the sequence specific assignments. In contrast, extensive (13)C-spin diffusion makes the solution (13)C-(13)C NOESY experiment our gold standard to monitor protein side chains both in the apoprotein alone and in its interaction with paramagnetic iron species, inducing line broadening on the resonances of nearby residues. We could retrieve the structural information embedded in the (13)C-(13)C NOESY due to a partial sequence specific assignment of protein backbone and side chains we obtained from solid state MAS NMR of ferritin microcrystals. We used the 59 assigned amino acids (∼33% of the total) as probes to locate paramagnetic ferric species in the protein cage. Through this approach, we could identify ferric dimers at the ferroxidase site and on their pathway towards the nanocage. Comparison with existing data on bacterioferritins and bacterial ferritins, as well as with eukaryotic ferritins loaded with various nonfunctional divalent ions, allowed us to reinterpret the available information. The resulting picture of the ferroxidase site is slightly different with various ferritins but is designed to provide multiple and generally weak iron ligands. The latter assist binding of two incoming iron(II) ions in two proximal positions to facilitate coupling with oxygen. Subsequent oxidation is accompanied by a decrease in the metal-metal distance (consistent with XAS/Mössbauer) and in the number of protein residues involved in metal coordination, facilitating the release of products as di-iron clusters under the effect of new incoming iron(II) ions.
Collapse
Affiliation(s)
- Daniela Lalli
- CERM and Department of Chemistry, University of Florence, via Sacconi 6, 50019, Sesto Fiorentino, Florence, Italy
| | - Paola Turano
- CERM and Department of Chemistry, University of Florence, via Sacconi 6, 50019, Sesto Fiorentino, Florence, Italy
| |
Collapse
|
31
|
Zheng S, Berto TC, Dahl EW, Hoffman MB, Speelman AL, Lehnert N. The functional model complex [Fe2(BPMP)(OPr)(NO)2](BPh4)2 provides insight into the mechanism of flavodiiron NO reductases. J Am Chem Soc 2013; 135:4902-5. [PMID: 23472831 DOI: 10.1021/ja309782m] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Flavodiiron nitric oxide reductases (FNORs), found in many pathogenic bacteria, are able to detoxify NO by reducing it to N2O. In this way, FNORs equip these pathogens with immunity to NO, which is a central immune defense agent in humans. Hence, FNORs are thought to promote infection of the human body, leading to chronic diseases. Despite this importance of FNORs for bacterial pathogenesis, the mechanism of NO reduction by these enzymes is not well understood. Here we present the synthesis and spectroscopic characterization of the diiron dinitrosyl model complex [Fe2(BPMP)(OPr)(NO)2](BPh4)2. The crystal structure of this complex shows two end-on-coordinated {FeNO}(7) units that, based on spectroscopic and electrochemical results, are only weakly electronically coupled. Importantly, reduction of this complex by two electrons leads to the clean formation of N2O in quantitative yield. This complex therefore represents the first example of a functional model system for FNORs. The results provide key mechanistic insight into the mechanism of FNORs and, in particular, represent strong support for the proposed "super-reduced" mechanism for these enzymes.
Collapse
Affiliation(s)
- Sheng Zheng
- Department of Chemistry, The University of Michigan , Ann Arbor, Michigan 48109-1055, United States
| | | | | | | | | | | |
Collapse
|
32
|
Milunovic MNM, Martins LMDRS, Alegria ECBA, Pombeiro AJL, Krachler R, Trettenhahn G, Turta C, Shova S, Arion VB. Hexanuclear and undecanuclear iron(iii) carboxylates as catalyst precursors for cyclohexane oxidation. Dalton Trans 2013; 42:14388-401. [DOI: 10.1039/c3dt50966d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
33
|
Govor EV, Chakraborty I, Piñero DM, Baran P, Sanakis Y, Raptis RG. Structural and 57Fe-Mössbauer characterization of mononuclear ferrous and ferric pyrazole complexes. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.07.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
34
|
Valence-directed assembly and magnetic properties of two polynuclear pyrazine-2-amidoxime Fe complexes. INORG CHEM COMMUN 2012. [DOI: 10.1016/j.inoche.2012.05.036] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
35
|
Das S, Chakraborty I, Skachkov D, Ahmadi M, Ishikawa Y, Baran P, Raptis RG. Water-Soluble Derivatives of Octanuclear Iron-Oxo-Pyrazolato Complexes; An Experimental and Computational Study. Eur J Inorg Chem 2012; 2012:10.1002/ejic.201200428. [PMID: 24496308 PMCID: PMC3564675 DOI: 10.1002/ejic.201200428] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2012] [Indexed: 11/08/2022]
Abstract
Two water-soluble iron-pyrazolato complexes, [Fe8], have been prepared by the introduction of twelve hydroxyalkyl groups to the periphery of the approximately spherical octanuclear molecule and they are contrasted with their two organosoluble chloroalkyl analogues. All four new complexes, 1 - 4, have been characterized in solution by 1H-NMR and electrospray ionization mass spectroscopy. The one-electron reduction product of the water-soluble 3, [Fe8]-, has been structurally characterized by single crystal diffraction methods. In aqueous media, the four terminal Fe-Cl bonds of [Fe8] are partially hydrolysed and the resulting chloro/aqua/hydroxo species form supramolecular nanoscale aggregates, as determined by dynamic light scattering and electron microscopy. Preliminary computational studies by density functional theory methods have been employed in order to model the H-bonding interactions controlling the competing solvation and aggregation processes.
Collapse
Affiliation(s)
- Soma Das
- Department of Chemistry and the Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3346, USA, Fax: (+) 787-7648242
| | - Indranil Chakraborty
- Department of Chemistry and the Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3346, USA, Fax: (+) 787-7648242
| | - Dmitry Skachkov
- Department of Chemistry and the Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3346, USA, Fax: (+) 787-7648242
| | - Majid Ahmadi
- Department of Physics, University of Puerto Rico, San Juan, PR 00931-3343, USA
| | - Yasuyuki Ishikawa
- Department of Chemistry and the Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3346, USA, Fax: (+) 787-7648242
| | - Peter Baran
- Department of Chemistry and the Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3346, USA, Fax: (+) 787-7648242
| | - Raphael G. Raptis
- Department of Chemistry and the Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3346, USA, Fax: (+) 787-7648242
| |
Collapse
|
36
|
Gatteschi D, Fittipaldi M, Sangregorio C, Sorace L. Exploring the no-man's land between molecular nanomagnets and magnetic nanoparticles. Angew Chem Int Ed Engl 2012; 51:4792-800. [PMID: 22473984 DOI: 10.1002/anie.201105428] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 01/13/2012] [Indexed: 12/26/2022]
Abstract
The comparison of the structural and magnetic properties of molecular nanomagnets (MNM) and magnetic nanoparticles (MNP) can be instructive to get a deeper understanding of the magnetic behavior on the intermediate scale between molecular and bulk objects. In this respect iron oxo based clusters are particularly interesting, since they provide an increasing number of molecular systems with sizes close to that of iron oxide MNP. In this Minireview we report a survey of literature data aimed at improving our understanding of the emergence of MNP properties from MNM ones.
Collapse
Affiliation(s)
- Dante Gatteschi
- Department of Chemistry and RU INSTM, University of Florence, Italy.
| | | | | | | |
Collapse
|
37
|
Gatteschi D, Fittipaldi M, Sangregorio C, Sorace L. Erforschung des Niemandslandes zwischen molekularen Magneten und magnetischen Nanopartikeln. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201105428] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
38
|
Masello A, Sanakis Y, Boudalis AK, Abboud KA, Christou G. Iron(III) Chemistry with Ferrocene-1,1′-dicarboxylic Acid (fdcH2): An Fe7 Cluster with an Oxidized fdc– Ligand. Inorg Chem 2011; 50:5646-54. [DOI: 10.1021/ic200348s] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Antonio Masello
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Yiannis Sanakis
- Institute of Materials Science, NCSR “Demokritos”, 15310 Aghia Paraskevi Attikis, Greece
| | | | - Khalil A. Abboud
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - George Christou
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| |
Collapse
|
39
|
Chakrabarti M, Münck E, Bominaar EL. Density functional theory study of an all ferrous 4Fe-4S cluster. Inorg Chem 2011; 50:4322-6. [PMID: 21476577 DOI: 10.1021/ic102287j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The all-ferrous, carbene-capped Fe(4)S(4) cluster, synthesized by Deng and Holm (DH complex), has been studied with density functional theory (DFT). The geometry of the complex was optimized for several electronic configurations. The lowest energy was obtained for the broken-symmetry (BS) configuration derived from the ferromagnetic state by reversing the spin projection of one of the high spin (S(i) = 2) irons. The optimized geometry of the latter configuration contains one unique and three equivalent iron sites, which are both structurally and electronically clearly distinguishable. For example, a distinctive feature of the unique iron site is the diagonal Fe···S distance, which is 0.3 Å longer than for the equivalent irons. The calculated (57)Fe hyperfine parameters show the same 1:3 pattern as observed in the Mössbauer spectra and are in good agreement with experiment. BS analysis of the exchange interactions in the optimized geometry for the 1:3, M(S) = 4, BS configuration confirms the prediction of an earlier study that the unique site is coupled to the three equivalent ones by strong antiferromagnetic exchange (J > 0 in J Σ(j<4)Ŝ(4)·Ŝ(j)) and that the latter are mutually coupled by ferromagnetic exchange (J' < 0 in J' Σ(i<j<4)Ŝ(i)·Ŝ(j)). In combination, these exchange couplings stabilize an S = 4 ground state in which the composite spin of the three equivalent sites (S(123) = 6) is antiparallel to the spin (S(4) = 2) of the unique site. Thus, DFT analysis supports the idea that the unprecedented high value of the spin of the DH complex and, by analogy, of the all-ferrous cluster of the Fe-protein of nitrogenase, results from a remarkably strong dependence of the exchange interactions on cluster core geometry. The structure dependence of the exchange-coupling constants in the Fe(II)-(μ(3)-S)(2)-Fe(II) moieties of the all-ferrous clusters is compared with the magneto-structural correlations observed in the data for dinuclear copper complexes. Finally, we discuss two all-ferric clusters in the light of the results for the all-ferrous cluster.
Collapse
Affiliation(s)
- Mrinmoy Chakrabarti
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA
| | | | | |
Collapse
|
40
|
Tong JP, Shao F, Tao J, Huang RB, Zheng LS. Microwave-Assisted Synthesis of a Ferrimagnetic Dodecanuclear Iron(III) Complex with a Fe4(OH)4 Cubane Core. Inorg Chem 2011; 50:2067-9. [DOI: 10.1021/ic102411u] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jia-Ping Tong
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Feng Shao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Jun Tao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Rong-Bin Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| | - Lan-Sun Zheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China
| |
Collapse
|
41
|
Zueva EM, Sameera WMC, Piñero DM, Chakraborty I, Devlin E, Baran P, Lebruskova K, Sanakis Y, McGrady JE, Raptis RG. Experimental and theoretical Mössbauer study of an extended family of [Fe8(μ4-O)4(μ-4-R-px)12X4] clusters. Inorg Chem 2010; 50:1021-9. [PMID: 21188980 DOI: 10.1021/ic101691q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Six [Fe(8)(μ(4)-O)(4)(μ-4-R-pyrazolato)(12)X(4)] complexes containing an identical Fe(8)(μ(4)-O)(4) core have been structurally characterized and studied by Mössbauer spectroscopy. In each case, an inner μ(4)-O bridged Fe(III) cubane core is surrounded by four trigonal bipyramidal iron centers, the two distinct sites occurring in a 1:1 ratio. The Mössbauer spectrum of each of the clusters consists of two quadrupole doublets, which, with one exception (X = NCS, R = H), overlap to give three absorption lines. The systematic variation of X and R causes significant changes in the Mössbauer spectra. A comparison with values for the same clusters computed using density functional theory allows us to establish an unequivocal assignment of these peaks in terms of a nested model for the overlapping doublets. The changes in Mössbauer parameters (both experimental and computed) for the 1-electron reduced species [Fe(8)(μ(4)-O)(4)(μ-4-Cl-pyrazolato)(12)Cl(4)](-) are consistent with a redox event that is localized within the cubane core.
Collapse
Affiliation(s)
- Ekaterina M Zueva
- Department of Inorganic Chemistry, Kazan State Technological University, Kazan, Russia
| | | | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Viciano‐Chumillas M, Tanase S, de Jongh LJ, Reedijk J. Coordination Versatility of Pyrazole‐Based Ligands towards High‐Nuclearity Transition‐Metal and Rare‐Earth Clusters. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000412] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Marta Viciano‐Chumillas
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P. O. Box 9502, 2300 RA Leiden, The Netherlands, Fax: +31‐71‐527‐4671
- Leiden Institute of Physics, Kamerlingh Onnes Laboratory,Leiden University, P. O. Box 9504, 2300 RA Leiden, The Netherlands, Fax: +31‐71‐527‐5404
| | - Stefania Tanase
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P. O. Box 9502, 2300 RA Leiden, The Netherlands, Fax: +31‐71‐527‐4671
- Current address: Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - L. Jos de Jongh
- Leiden Institute of Physics, Kamerlingh Onnes Laboratory,Leiden University, P. O. Box 9504, 2300 RA Leiden, The Netherlands, Fax: +31‐71‐527‐5404
| | - Jan Reedijk
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P. O. Box 9502, 2300 RA Leiden, The Netherlands, Fax: +31‐71‐527‐4671
| |
Collapse
|
43
|
Murali M, Nayak S, Sánchez Costa J, Ribas J, Mutikainen I, Turpeinen U, Clémancey M, Garcia-Serres R, Latour JM, Gamez P, Blondin G, Reedijk J. Discrete tetrairon(III) cluster exhibiting a square-planar Fe4(mu4-O) core: structural and magnetic properties. Inorg Chem 2010; 49:2427-34. [PMID: 20121207 DOI: 10.1021/ic902360x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The aerobic reaction of the Schiff-base ligand N-(benzimidazol-2-yl)salicylaldimine (Hbisi) with iron(II) perchlorate in methanol leads to the formation of the remarkable coordination compound [Fe(4)(mu(4)-O)(mu-MeO)(4)(bisi)(4)](ClO(4))(2) x 4 MeOH (1), whose single-crystal X-ray structure reveals the presence of a discrete Fe(III)(4)(mu(4)-O) core. Magnetic and Mossbauer studies both show that the exchange interaction within the square tetranuclear iron(III) unit is dominated by the central bridging mu(4)-oxido ligand, the involvement of the mu-methoxido bridges being negligible.
Collapse
Affiliation(s)
- Mariappan Murali
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Viciano-Chumillas M, de Ruiter G, Tanase S, Smits JMM, de Gelder R, Mutikainen I, Turpeinen U, de Jongh LJ, Reedijk J. High nuclearity manganese(iii) compounds containing phenol-pyrazole ligands: the influence of the ligand on the core geometry. Dalton Trans 2010; 39:4991-8. [DOI: 10.1039/b924776a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
45
|
NMR reveals pathway for ferric mineral precursors to the central cavity of ferritin. Proc Natl Acad Sci U S A 2009; 107:545-50. [PMID: 20018746 DOI: 10.1073/pnas.0908082106] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Ferritin is a multimeric nanocage protein that directs the reversible biomineralization of iron. At the catalytic ferroxidase site two iron(II) ions react with dioxygen to form diferric species. In order to study the pathway of iron(III) from the ferroxidase site to the central cavity a new NMR strategy was developed to manage the investigation of a system composed of 24 monomers of 20 kDa each. The strategy is based on (13)C-(13)C solution NOESY experiments combined with solid-state proton-driven (13)C-(13)C spin diffusion and 3D coherence transfer experiments. In this way, 75% of amino acids were recognized and 35% sequence-specific assigned. Paramagnetic broadening, induced by iron(III) species in solution (13)C-(13)C NOESY spectra, localized the iron within each subunit and traced the progression to the central cavity. Eight iron ions fill the 20-A-long iron channel from the ferrous/dioxygen oxidoreductase site to the exit into the cavity, inside the four-helix bundle of each subunit, contrasting with short paths in models. Magnetic susceptibility data support the formation of ferric multimers in the iron channels. Multiple iron channel exits are near enough to facilitate high concentration of iron that can mineralize in the ferritin cavity, illustrating advantages of the multisubunit cage structure.
Collapse
|
46
|
Yi Z, Yi Z, Yang C, Xia W, Xu X, Zhang X. Formation of a 3D porous ferric arsenate containing novel cubane-like Fe4F4 building units. Inorg Chem 2009; 48:9959-61. [PMID: 19785467 DOI: 10.1021/ic900892q] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The purely inorganic microporous compound [H(3)O][Fe(4)F(4)(AsO(4))(3)] x 3 H(2)O (1), which contains novel cubane-like Fe(4)F(4) cages, exhibiting a 3D configuration with channels of dimensions 8 A x 8 A running along the [001], [010], and [100] directions, presents antiferromagnetic interactions.
Collapse
Affiliation(s)
- Zhihui Yi
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | | | | | | | | | | |
Collapse
|
47
|
Clemente-Juan JM, Borrás-Almenar JJ, Coronado E, Palii AV, Tsukerblat BS. High-nuclearity mixed-valence clusters and mixed-valence chains: general approach to the calculation of the energy levels and bulk magnetic properties. Inorg Chem 2009; 48:4557-68. [PMID: 19371089 DOI: 10.1021/ic802201h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A general approach to the problem of electron delocalization in the high-nuclearity mixed-valence (MV) clusters containing an arbitrary number of localized spins and itinerant electrons is developed. Along with the double exchange, we consider the isotropic magnetic exchange between the localized electrons as well as the Coulomb intercenter repulsion. As distinguished from the previous approaches dealing with the MV systems in which itinerant electrons are delocalized over all constituent metal sites, here, we consider a more common case of systems exhibiting partial delocalization and containing several delocalized domains. Taking full advantage of the powerful angular momentum technique, we were able to derive closed form analytical expressions for the matrix elements of the full Hamiltonian. These expressions provide an efficient tool for treating complex mixed-valence systems, because they contain only products of 6j-symbols (that appear while treating the delocalized parts) and 9j-symbols (exchange interactions in localized parts) and do not contain high-order recoupling coefficients and 3j-symbols that essentially constrained all previous theories of mixed valency. The approach developed here is accompanied by an efficient computational procedure that allows us to calculate the bulk thermodynamic properties (magnetic susceptibility, magnetization, and magnetic specific heat) of high-nuclearity MV clusters. Finally, this approach has been used to discuss the magnetic properties of the octanuclear MV cluster [Fe(8)(mu(4)-O)(4)(4-Cl-pz)(12)Cl(4)](-) and the diphthalocyanine chains [YPc(2)].CH(2)Cl(2) and [ScPc(2)].CH(2)Cl(2) composed of MV dimers interacting through the magnetic exchange and Coulomb repulsion.
Collapse
Affiliation(s)
- J M Clemente-Juan
- Instituto de Ciencia Molecular, Universidad de València, Polgono de la Coma, s/n 46980 Paterna, Spain.
| | | | | | | | | |
Collapse
|
48
|
Sanz M, Mosquera MEG, Cuenca T. Novel dinuclear dimethylamido-3,5-dimethylpyrazolato and tetranuclear dimethylamido-3,5-dimethylpyrazolato-polyoxo zirconium(IV) complexes. Synthesis and structural characterisation. Dalton Trans 2009:2616-22. [PMID: 19319407 DOI: 10.1039/b817574h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dinuclear dimethylamido-tris(3,5-dimethylpyrazolato)-zirconium(IV) complex [Zr(3,5-Me2Pz)3(NMe2)]2 1 is prepared by treatment of [Zr(NMe2)4] with 3 equivalents of 3,5-dimethylpyrazole (3,5-Me2PzH) with elimination of dimethylamine. When [Zr(NMe2)4] reacted with 2 equivalents of 3,5-Me2PzH, the bis(dimethylamido)-bis(3,5-dimethylpyrazolato)zirconium(IV) compound [Zr(3,5-Me2Pz)2(NMe2)2]2 2 is obtained. Hydrolysis of [Zr(3,5-Me2Pz)3(NMe2)]2 in wet toluene affords the tetranuclear oxo compound [Zr4(eta2-3,5-Me2Pz)4(NMe2)2(mu3-O)2(mu2-3,5-Me2Pz)4(mu2-NMe2)2] . All synthesised compounds are characterised by NMR spectroscopic and analytical methods. Single crystal X-ray diffraction analysis has established the molecular structures of 1 and 4.
Collapse
Affiliation(s)
- Martial Sanz
- Departamento de Química Inorgánica, Universidad de Alcalá, Facultad de Farmacia, Campus Universitario, E-28871, Alcalá de Henares, Spain
| | | | | |
Collapse
|
49
|
Abstract
This Perspective summarises the chemistry of the pyrazole ring, and reviews the metal coordination modes adopted by 1H-pyrazoles and their anions. Pyrazolide anions are probably the most versatile ligands in coordination chemistry, with 20 different terminal or bridging coordination modes having been identified so far. Metal cluster compounds supported by pyrazolido ligation are surveyed, concentrating on those reported during the past ten years. Highlights include the wide structural diversity in apparently simple main group pyrazolides; luminescence and charge-transfer complexes in coinage metal pyrazolide clusters; the use of robust metal pyrazolide clusters to construct liquid crystals, supramolecular materials and metal-organic frameworks; and supramolecular complexes formed by pyrazolide-supported metallacrowns.
Collapse
|
50
|
Chakraborty I, Baran P, Sanakis Y, Simopoulos A, Fachini E, Raptis RG. A mixed-valence octanuclear iron-oxo pyrazolate: assessment of electronic delocalization by structural and spectroscopic analysis. Inorg Chem 2008; 47:11734-7. [PMID: 18998629 DOI: 10.1021/ic801459s] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A formally Fe(III)(7)Fe(II) complex, containing an inner Fe(4)O(4)-cubane and four peripheral Fe centers, is derived from the one-electron reduction of its Fe(III)(8) precursor. Spectroscopic analysis of the former reveals that the redox activity of this Fe(8) system is confined within its cubane core. The resulting (Fe(4)O(4))(3+)-cubane, which is valence-delocalized in the NMR, Mössbauer, and IR spectroscopy time scales but valence-trapped in the X-ray photoelectron spectroscopy (XPS) time scale, is better described as a Robin-Day class-II system by the analysis of its near-infrared (NIR) intervalence charge transfer (IVCT) band profile.
Collapse
Affiliation(s)
- Indranil Chakraborty
- Department of Chemistry and the Institute of Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3346
| | | | | | | | | | | |
Collapse
|