1
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Fedulin A, Gupta SK, Rüter I, Meyer F, Jacobi von Wangelin A. Polynuclear Iron(II) Pyridonates: Synthesis and Reactivity of Fe 4 and Fe 5 Clusters. Inorg Chem 2022; 61:6149-6159. [PMID: 35404595 DOI: 10.1021/acs.inorgchem.2c00294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The combination of pyridonate ligands with transition metal ions enables the synthesis of an especially rich set of diverse coordination compounds involving various κ- and μ-bonding modes and higher nuclearities. With iron(II) ions, this chemical space is rather poorly explored beyond some biomimetic models of the pyridone iron-containing hydrogenase. Here, the topologically new Fe5 and Fe4 clusters, Fe5(LH)6[N(SiMe3)2]4 (1) and Fe4(LMe)6[N(SiMe3)2]2 (2), were synthesized (LH = 2-pyridonate; LMe = 6-methyl-2-pyridonate). Complex 1 contained an unprecedented diamondoid Fe@Fe4 tetrahedron with a central-to-peripheral Fe-Fe distance of ∼3.1 Å. The crystal structure of complex 2 displayed an Fe4O6 butterfly motif containing a planar Fe4 arrangement. Mössbauer spectroscopy confirmed the high-spin ferrous character of all iron ions. SQUID magnetometry reveals that the Fe(II) ions are involved in weak magnetic exchange coupling across the pyridonate bridges that results in antiferromagnetic interactions. The Fe4 cluster exhibits slow relaxation of magnetization under an applied magnetic field with an effective energy barrier of 38.5 K, rarely observed among the very rare examples of Fe(II) cluster-based single-molecule magnets. Studies of protolytic substitution of the amido ligands demonstrated the lability of the diamondoid Fe5 core in 1 and the stability of the Fe4 rhomboid in 2.
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Affiliation(s)
- Andrey Fedulin
- Department of Chemistry, University of Hamburg, Martin Luther King Pl 6, Hamburg 20146, Germany
| | - Sandeep K Gupta
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstr. 4, Göttingen 37077, Germany
| | - Isabelle Rüter
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstr. 4, Göttingen 37077, Germany
| | - Franc Meyer
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstr. 4, Göttingen 37077, Germany
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2
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Jablonski J, Bresien J, Köckerling M. An Unprecedented Cluster Unit in (BMIm)
2
[Hf
9
Cl
14
H
8
(AlCl
4
)
6
]. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jonas Jablonski
- Universität Rostock Institut für Chemie Anorganische Festkörperchemie Albert-Einstein-Str. 3a 18059 Rostock Germany
| | - Jonas Bresien
- Universität Rostock Institut für Chemie Anorganische und Elementorganische Chemie Albert-Einstein-Str. 3a 18059 Rostock Germany
| | - Martin Köckerling
- Universität Rostock Institut für Chemie Anorganische Festkörperchemie Albert-Einstein-Str. 3a 18059 Rostock Germany
- Universität Rostock Department Life Light and Matter 18051 Rostock Germany
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3
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Bag R, Sikdar Y, Saha P, Ghosh P, Drew MGB, Tang J, Goswami S. Enhancement of the coordinating flexibility in a Schiff–Mannich combo ligand: forced generation of a new Ni II–O phenoxo–Ln III–O alkoxo–Ln III array (Ln = Gd, Tb, Dy and Ho). NEW J CHEM 2021. [DOI: 10.1039/d0nj05812b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A series of 3d–4f complexes, containing rare NiLn2O4 topology, were synthesized by designing a new type of combo Schiff base–Mannich ligand.
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Affiliation(s)
- Riya Bag
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
| | - Yeasin Sikdar
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
| | - Pinaki Saha
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
| | - Prasanta Ghosh
- Department of Chemistry
- R. K. Mission Residential College
- Kolkata-700103
- India
| | | | - Jinkui Tang
- State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Sanchita Goswami
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
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4
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Maniaki D, Pilichos E, Perlepes SP. Coordination Clusters of 3d-Metals That Behave as Single-Molecule Magnets (SMMs): Synthetic Routes and Strategies. Front Chem 2018; 6:461. [PMID: 30356793 PMCID: PMC6190736 DOI: 10.3389/fchem.2018.00461] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 09/14/2018] [Indexed: 11/18/2022] Open
Abstract
The area of 3d-metal coordination clusters that behave as Single-Molecule Magnets (SMMs) is now quite mature within the interdisciplinary field of Molecular Magnetism. This area has created a renaissance in Inorganic Chemistry. From the synthetic Inorganic Chemistry viewpoint, the early years of "try and see" exercises (1993-2000) have been followed by the development of strategies and strict approaches. Our review will first summarize the early synthetic efforts and routes for the preparation of polynuclear 3d-metal SMMs, and it will be then concentrated on the description of the existing strategies. The former involve the combination of appropriate 3d-metal-containing starting materials (simple salts with inorganic anions, metal cardoxylates, and pre-formed carboxylate clusters, metal phosphonates) and one or two primary organic ligands; the importance of the end-on azido group as a ferromagnetic coupler in 3d-metal SMM chemistry will be discussed. The utility of comproportionation reactions and the reductive aggregation route for the construction of manganese SMMs will also be described. Most of the existing strategies for the synthesis of SMMs concern manganese. These involve substitution of carboxylate ligands in pre-formed SMMs by other carboxylate or non-carboxylate groups, reduction procedures for the {Mn 8 III Mn 4 IV } SMMs, spin "tweaking," "switching on" SMM properties upon conversion of low-spin clusters into high-spin ones, ground-state spin switching and enhancing SMM properties via targeted structural distortions, the use of radical bridging ligands and supramolecular approaches. A very useful strategy is also the "switching on" of SMM behavior through replacement of bridging hydroxide groups by end-on azido or isocyanato ligands in clusters. Selected examples will be mentioned and critically discussed. Particular emphasis will be given on the criteria for the choice of ligands.
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5
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Zhou GJ, Han T, Ding YS, Chilton NF, Zheng YZ. Metallacrowns as Templates for Diabolo-like {LnCu8
} Complexes with Nearly Perfect Square Antiprismatic Geometry. Chemistry 2017; 23:15617-15622. [DOI: 10.1002/chem.201703830] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Guo-Jun Zhou
- Frontier Institute of Science and Technology (FIST); Xi'an Jiaotong University; Xi'an 710054 P. R. China
| | - Tian Han
- Frontier Institute of Science and Technology (FIST); Xi'an Jiaotong University; Xi'an 710054 P. R. China
| | - You-Song Ding
- Frontier Institute of Science and Technology (FIST); Xi'an Jiaotong University; Xi'an 710054 P. R. China
| | - Nicholas F. Chilton
- School of Chemistry and Photon Science Institute; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Yan-Zhen Zheng
- Frontier Institute of Science and Technology (FIST); Xi'an Jiaotong University; Xi'an 710054 P. R. China
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6
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Henthorn JD, Mishra N, Haun CD, Castro AL, Douglas HG, Pegram M, Stadelmaier B, Huebner JS, Lampropoulos C. Reprint of “Using single-molecule magnets as analyte-recognition compounds in photo-electric chemical sensors: Recent results from [Mn12O12(O2CCH3)16(H2O)4]·2CH3COOH·4H2O, and [Mn12O12(O2CPh)16(H2O)4]”. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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7
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Fehlhammer WP, Beck W. Azide Chemistry - An Inorganic Perspective, Part I Metal Azides: Overview, General Trends and Recent Developments. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300162] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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8
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Using single-molecule magnets as analyte-recognition compounds in photo-electric chemical sensors: Recent results from [Mn12O12(O2CCH3)16(H2O)4]·2CH3COOH·4H2O, and [Mn12O12(O2CPh)16(H2O)4]. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.01.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Alexandropoulos DI, Papatriantafyllopoulou C, Li C, Cunha-Silva L, Manos MJ, Tasiopoulos AJ, Wernsdorfer W, Christou G, Stamatatos TC. Approaches to Molecular Magnetic Materials from the Use of Cyanate Groups in Higher Oxidation State Metal Cluster Chemistry: Mn14and Mn16. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300099] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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10
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Zhao JP, Zhao R, Hu BW, Yang Q, Zhang XF, Liu FC. Examples of Heterometallic 3d-3d Azido Complexes by One-Pot Synthesis. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201458] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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11
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Hou Y, Fang X, Kwon KD, Criscenti LJ, Davis D, Lambert T, Nyman M. Computational and Experimental Characterization of a Cagelike Fe
15
Polycation. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201128] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yu Hou
- Sandia National Laboratories, Albuquerque, NM 87185, USA
- Current address: Oregon State University, Department of Chemistry, Corvallis, OR 97331, USA, Fax: +1‐515‐294‐0689, http://www.chem.orst.edu/nyman
| | - Xikui Fang
- US DOE Ames Laboratory and Iowa State University, The Ames Laboratory, 148 Spedding Hall, Ames, IA 50011‐3020, USA, http://www.ameslab.gov/dmse/xfang
| | - Kideok D. Kwon
- Sandia National Laboratories, Albuquerque, NM 87185, USA
- Current address: Department of Geology, Kangwon National University, Chuncheon, 200‐701, Korea
| | | | - Danae Davis
- Sandia National Laboratories, Albuquerque, NM 87185, USA
| | - Tim Lambert
- Sandia National Laboratories, Albuquerque, NM 87185, USA
| | - May Nyman
- Sandia National Laboratories, Albuquerque, NM 87185, USA
- Current address: Oregon State University, Department of Chemistry, Corvallis, OR 97331, USA, Fax: +1‐515‐294‐0689, http://www.chem.orst.edu/nyman
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12
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Liu J, Qin YL, Qu M, Clérac R, Zhang XM. Rung-defected ladder of azido-bridged Cu(ii) chains linked by [Cu(picolinate)2] units. Dalton Trans 2013; 42:11571-5. [DOI: 10.1039/c3dt51363g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Scheurer A, Gieb K, Alam MS, Heinemann FW, Saalfrank RW, Kroener W, Petukhov K, Stocker M, Müller P. Synthesis, magnetic properties, and STM spectroscopy of an unprecedented octanuclear chloro-bridged nickel(ii) double cubane. Dalton Trans 2012; 41:3553-61. [DOI: 10.1039/c2dt12007k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Zhang TZ, Zhang ZM, Lu Y, Wang EB. A (3,6)-connected metal-organic framework consisting of chair-like {Fe6} clusters and BTC linkers. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.640398] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Tian-Zhan Zhang
- a Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry , Northeast Normal University , Ren Min Street No. 5268, Changchun , Jilin 130024 , P.R. China
| | - Zhi-Ming Zhang
- a Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry , Northeast Normal University , Ren Min Street No. 5268, Changchun , Jilin 130024 , P.R. China
| | - Ying Lu
- a Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry , Northeast Normal University , Ren Min Street No. 5268, Changchun , Jilin 130024 , P.R. China
| | - En-Bo Wang
- a Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry , Northeast Normal University , Ren Min Street No. 5268, Changchun , Jilin 130024 , P.R. China
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15
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Ma C, Hu M, Chen H, Chen C, Liu Q. A New Family of Homo‐ and Heterometallic Manganese Complexes at High Oxidation States Derived from the Oxidation of Mn
II
with Ce
IV
: Syntheses, Structures, and Magnetic Properties. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100719] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Cheng‐Bing Ma
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China, Fax: +86‐591‐83792395
| | - Ming‐Qiang Hu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China, Fax: +86‐591‐83792395
| | - Hui Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China, Fax: +86‐591‐83792395
| | - Chang‐Neng Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China, Fax: +86‐591‐83792395
| | - Qiu‐Tian Liu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China, Fax: +86‐591‐83792395
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16
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Scheurer A, Ako A, Saalfrank R, Heinemann F, Hampel F, Petukhov K, Gieb K, Stocker M, Müller P. Synthesis, Magnetic Properties, and STM Spectroscopy of Cobalt(II) Cubanes [CoII4(Cl)4(HL)4]. Chemistry 2010; 16:4784-92. [DOI: 10.1002/chem.200902578] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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17
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Zhang ZM, Li YG, Yao S, Wang EB, Wang YH, Clérac R. Enantiomerically pure chiral {Fe28} wheels. Angew Chem Int Ed Engl 2009; 48:1581-4. [PMID: 19156785 DOI: 10.1002/anie.200805827] [Citation(s) in RCA: 127] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Wheels of steel: Two enantiomerically pure chiral {Fe(28)} wheel-like aggregates have been synthesized from the acetate buffer solution containing ferric ions and chiral tartrate ligands (see picture). These compounds are the largest chiral ferric aggregates isolated to date.
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Affiliation(s)
- Zhi-Ming Zhang
- Key Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry, Northeast Normal University, Ren Min Street No.5268, Changchun, Jilin 130024, China
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18
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Zhang ZM, Li YG, Yao S, Wang EB, Wang YH, Clérac R. Enantiomerically Pure Chiral {Fe28} Wheels. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200805827] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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19
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Saalfrank R, Maid H, Scheurer A. Supramolecular Coordination Chemistry: The Synergistic Effect of Serendipity and Rational Design. Angew Chem Int Ed Engl 2008; 47:8794-824. [DOI: 10.1002/anie.200702075] [Citation(s) in RCA: 460] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Saalfrank R, Maid H, Scheurer A. Supramolekulare Koordinationschemie - Synergie von Zufallsentdeckung und rationalem Design. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200702075] [Citation(s) in RCA: 148] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Abarca B, Ballesteros R, Ballesteros-Garrido R, Colobert F, Leroux FR. Triazolopyridines. Part 26: The preparation of novel [1,2,3]triazolo[1,5-a]pyridine sulfoxides. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.02.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Boudalis A, Sanakis Y, Clemente-Juan J, Donnadieu B, Nastopoulos V, Mari A, Coppel Y, Tuchagues JP, Perlepes S. A Family of Enneanuclear Iron(II) Single-Molecule Magnets. Chemistry 2008; 14:2514-26. [DOI: 10.1002/chem.200701487] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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23
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Triazolopyridines. Part 25: Synthesis of new chiral ligands from [1,2,3]triazolo[1,5-a]pyridines. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.07.101] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Prakash R, Saalfrank RW, Maid H, Scheurer A, Heinemann FW, Trautwein AX, Böttger LH. Synthese und Redoxeigenschaften gemischtvalenter achtkerniger Eisendefekthexacubane und eines (CaCl)-überdachten raumzentrierten Eisen(III)-Sechsflächners. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200601478] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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25
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Prakash R, Saalfrank RW, Maid H, Scheurer A, Heinemann FW, Trautwein AX, Böttger LH. Synthesis and Redox Properties of Mixed-Valent Octanuclear Iron Defective Hexacubanes and a (CaCl)-Capped Body-Centered Six-Sided Iron(III) Polyhedron. Angew Chem Int Ed Engl 2006; 45:5885-9. [PMID: 16874837 DOI: 10.1002/anie.200601478] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Raju Prakash
- Institut für Organische Chemie, Universität Erlangen-Nürnberg, 91054 Erlangen, Germany.
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26
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ter Heerdt P, Stefan M, Goovaerts E, Caneschi A, Cornia A. Single-ion and molecular contributions to the zero-field splitting in an iron(III)-oxo dimer studied by single crystal W-band EPR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2006; 179:29-37. [PMID: 16325437 DOI: 10.1016/j.jmr.2005.10.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2005] [Revised: 10/24/2005] [Accepted: 10/25/2005] [Indexed: 05/05/2023]
Abstract
Detailed knowledge of the type and strength of pair interactions between high-spin metal ions is paramount to the understanding and design of molecular magnetic materials. In this work, the anisotropic magnetic interactions in a beta-diketonate-alkoxide iron(III) dimer compound, [Fe2(OCH3)2(dbm)4, Hdbm=dibenzoylmethane] (Fe2) have been investigated by single crystal electron paramagnetic resonance (EPR) in the W-band (at 95GHz). The diamagnetic substitution method was employed using the isomorphous gallium(III)-based compound doped with iron(III) to produce Ga-Fe dimers (GaFe). The single-ion zero-field splitting (ZFS) tensor could be separately determined in GaFe with the iron ion in a local environment quasi-identical to the one in Fe2. Its principal directions are found to point in arbitrary directions, uncorrelated with the Fe-O bonds. The Fe2 EPR spectra consist of transitions within the lowest multiplet states S=1,2,3, which were analyzed using the full spin Hamiltonian description of an exchange coupled pair of s=5/2 spins. The anisotropic spin-spin interaction tensor of Fe2 possesses a principal axis close to the Fe-Fe direction and was shown to arise both from through-space (dipolar) and through-bond (anisotropic exchange) contributions. The latter involves an rhombic component JE=(JX-JY)/2 approximately 0.093 cm-1 of magnitude comparable to the dipolar interaction, and even to the rhombic part of the single-ion ZFS (E=0.097 cm-1). Our results show that the anisotropic exchange, usually neglected for S-type ions, is significant for the anisotropic interactions in exchange-coupled iron(III) clusters, including the Fe4 and Fe8 families of single-molecule magnets and the antiferromagnetic iron wheels.
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Affiliation(s)
- Peter ter Heerdt
- Physics Department-CDE, University of Antwerp, Universiteitsplein 1, B-2610 Antwerpen (Wilrijk), Belgium
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27
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Boudalis AK, Raptopoulou CP, Abarca B, Ballesteros R, Chadlaoui M, Tuchagues JP, Terzis A. CoII Chemistry of 2,6-Bis(2-pyridylcarbonyl)pyridine: An Icosanuclear Co Cluster Exhibiting Superparamagnetic Relaxation. Angew Chem Int Ed Engl 2006; 45:432-5. [PMID: 16342307 DOI: 10.1002/anie.200502519] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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28
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Boudalis AK, Raptopoulou CP, Abarca B, Ballesteros R, Chadlaoui M, Tuchagues JP, Terzis A. CoII Chemistry of 2,6-Bis(2-pyridylcarbonyl)pyridine: An Icosanuclear Co Cluster Exhibiting Superparamagnetic Relaxation. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200502519] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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29
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Saalfrank RW, Scheurer A, Bernt I, Heinemann FW, Postnikov AV, Schünemann V, Trautwein AX, Alam MS, Rupp H, Müller P. The {FeIII[FeIII(L1)2]3} star-type single-molecule magnet. Dalton Trans 2006:2865-74. [PMID: 16751895 DOI: 10.1039/b515980f] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Star-shaped complex [Fe(III)[Fe(III)(L1)2]3] (3) was synthesized starting from N-methyldiethanolamine H2L1 (1) and ferric chloride in the presence of sodium hydride. For 3, two different high-spin iron(III) ion sites were confirmed by Mössbauer spectroscopy at 77 K. Single-crystal X-ray structure determination revealed that 3 crystallizes with four molecules of chloroform, but, with only three molecules of dichloromethane. The unit cell of 3.4CHCl3 contains the enantiomers (delta)-[(S,S)(R,R)(R,R)] and (lambda)-[(R,R)(S,S)(S,S)], whereas in case of 3.3CH2Cl2 four independent molecules, forming pairs of the enantiomers [lambda-(R,R)(R,R)(R,R)]-3 and [lambda-(S,S)(S,S)(S,S)]-3, were observed in the unit cell. According to SQUID measurements, the antiferromagnetic intramolecular coupling of the iron(III) ions in 3 results in a S = 10/2 ground state multiplet. The anisotropy is of the easy-axis type. EPR measurements enabled an accurate determination of the ligand-field splitting parameters. The ferric star 3 is a single-molecule magnet (SMM) and shows hysteretic magnetization characteristics below a blocking temperature of about 1.2 K. However, weak intermolecular couplings, mediated in a chainlike fashion via solvent molecules, have a strong influence on the magnetic properties. Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) were used to determine the structural and electronic properties of star-type tetranuclear iron(III) complex 3. The molecules were deposited onto highly ordered pyrolytic graphite (HOPG). Small, regular molecule clusters, two-dimensional monolayers as well as separated single molecules were observed. In our STS measurements we found a rather large contrast at the expected locations of the metal centers of the molecules. This direct addressing of the metal centers was confirmed by DFT calculations.
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Affiliation(s)
- Rolf W Saalfrank
- Institut für Organische Chemie, Universität Erlangen-Nürnberg, Henkestr. 42, 91054, Erlangen, Germany.
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Thiakou KA, Nastopoulos V, Terzis A, Raptopoulou CP, Perlepes SP. Di-2-pyridyl ketone in lanthanide(III) chemistry: Mononuclear and dinuclear erbium(III) complexes. Polyhedron 2006. [DOI: 10.1016/j.poly.2005.07.029] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Katsoulakou E, Bekiari V, Raptopoulou CP, Terzis A, Lianos P, Manessi-Zoupa E, Perlepes SP. Dinuclear versus tetranuclear cluster formation in zinc(II) nitrate/di-2-pyridyl ketone chemistry: synthetic, structural and spectroscopic studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 61:1627-1638. [PMID: 15820896 DOI: 10.1016/j.saa.2004.11.065] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2004] [Accepted: 11/20/2004] [Indexed: 05/24/2023]
Abstract
The use of di-2-pyridyl ketone, (py)2CO, in zinc(II) nitrate chemistry has yielded a dinuclear complex and a cationic tetranuclear cluster. The 1:1 Zn(NO3)2.4H2O/(py)2CO reaction system in EtOH gives [Zn2(NO3)2{(py)2C(OEt)O}2].0.5H2O (1.0.5H2O), whereas the same reaction system in MeCN yields [Zn4(NO3)3{(py)2C(OH)O}4(H2O)](NO3) (2). The monoanionic derivatives of the hemiacetal and the gem-diol forms of di-2-pyridyl ketone have been derived from the ZnII-mediated addition of solvent (EtOH, H2O involved in MeCN) on the carbonyl group of (py)2CO. Each (py)2C(OEt)O- ion functions as an eta1:eta2:eta1:mu2 ligand in 1.0.5H2O chelating the two ZnII atoms through the 2-pyridyl nitrogen atoms and the common bridging, deprotonated oxygen atom; one asymmetric chelating nitrate completes six coordination at each metal center. The tetranuclear cluster cation of 2 has a cubane topology with the ZnII ions and the deprotonated oxygen atoms from the four eta1:eta3:eta1:mu3 (py)2C(OH)O- ligands occupying alternate vertices. Three monodentate nitrates and one aqua ligand complete the sixth coordination site at the metal ions. The two complexes have been characterized by IR and far-IR spectroscopies. Characteristic bands are discussed in terms of the known structures and the coordination modes of the nitrato ligands. Upon excitation at 371 nm, complex 2 displays blue photoluminescence in the solid state at room temperature with two emission maxima at 430 and 455 nm.
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Meyer F, Demeshko S, Leibeling G, Kersting B, Kaifer E, Pritzkow H. Structures and Magnetic Properties of Tetranuclear Nickel(II) Complexes with Unusual ?3-1,1,3 Azido Bridges. Chemistry 2005; 11:1518-26. [PMID: 15669064 DOI: 10.1002/chem.200400945] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Pyrazolate-based dinucleating ligands with thioether-containing chelate arms have been used for the synthesis of a family of novel tetranuclear nickel(II) complexes [L2Ni4(N3)3(O2CR)](ClO4)2 that incorporate three azido bridges and one carboxylate (R = Me, Ph). Molecular structures have been elucidated by X-ray crystallography in four cases, revealing Ni4 cores with a unique topology in which two of the azido ligands adopt an unusual mu3-1,1,3 bridging mode. The compounds were further characterized by mass spectrometry, IR spectroscopy, and variable-temperature magnetic susceptibility measurements. Magnetic data analyses indicate a combination of significant intramolecular ferromagnetic and antiferromagnetic exchange interactions that give rise to an overall S(T) = 0 ground state. The sign and the magnitude of the individual couplings have been rationalized in the framework of the common magnetostructural correlations for end-to-end and end-on azido linkages, suggesting that these correlations also remain valid for the respective fragments of multiply bridging mu3-1,1,3 azido ligands.
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Affiliation(s)
- Franc Meyer
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany.
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Tasiopoulos AJ, Wernsdorfer W, Abboud KA, Christou G. A Reductive-Aggregation Route to [Mn12O12(OMe)2(O2CPh)16(H2O)2]2? Single-Molecule Magnets Related to the [Mn12] Family. Angew Chem Int Ed Engl 2004. [DOI: 10.1002/ange.200461551] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Tasiopoulos AJ, Wernsdorfer W, Abboud KA, Christou G. A Reductive-Aggregation Route to [Mn12O12(OMe)2(O2CPh)16(H2O)2]2? Single-Molecule Magnets Related to the [Mn12] Family. Angew Chem Int Ed Engl 2004; 43:6338-42. [PMID: 15558665 DOI: 10.1002/anie.200461551] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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