1
|
Panda S, Phan H, Dunietz EM, Brueggemeyer MT, Hota PK, Siegler MA, Jose A, Bhadra M, Solomon EI, Karlin KD. Intramolecular Phenolic H-Atom Abstraction by a N 3ArOH Ligand-Supported (μ-η 2:η 2-Peroxo)dicopper(II) Species Relevant to the Active Site Function of oxy-Tyrosinase. J Am Chem Soc 2024; 146:14942-14947. [PMID: 38775712 DOI: 10.1021/jacs.4c04402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
Synthetic side-on peroxide-bound dicopper(II) (SP) complexes are important for understanding the active site structure/function of many copper-containing enzymes. This work highlights the formation of new {CuII(μ-η2:η2-O22-)CuII} complexes (with electronic absorption and resonance Raman (rR) spectroscopic characterization) using tripodal N3ArOH ligands at -135 °C, which spontaneously participate in intramolecular phenolic H-atom abstraction (HAA). This results in the generation of bis(phenoxyl radical)bis(μ-OH)dicopper(II) intermediates, substantiated by their EPR/UV-vis/rR spectroscopic signatures and crystal structural determination of a diphenoquinone dicopper(I) complex derived from ligand para-C═C coupling. The newly observed chemistry in these ligand-Cu systems is discussed with respect to (a) our Cu-MeAN (tridentate N,N,N',N',N″-pentamethyldipropylenetriamine)-derived model SP species, which was unreactive toward exogenous monophenol addition (J. Am. Chem. Soc. 2012, 134, 8513-8524), emphasizing the impact of intramolecularly tethered ArOH groups, and (b) recent advances in understanding the mechanism of action of the tyrosinase (Ty) enzyme.
Collapse
Affiliation(s)
- Sanjib Panda
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Hai Phan
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Eleanor M Dunietz
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | | | - Pradip Kumar Hota
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Maxime A Siegler
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Anex Jose
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Mayukh Bhadra
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Edward I Solomon
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Kenneth D Karlin
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| |
Collapse
|
2
|
Magnetostructural Properties of Some Doubly-Bridged Phenoxido Copper(II) Complexes. Molecules 2023; 28:molecules28062648. [PMID: 36985621 PMCID: PMC10058975 DOI: 10.3390/molecules28062648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 03/10/2023] [Accepted: 03/10/2023] [Indexed: 03/17/2023] Open
Abstract
Three new tripod tetradentate phenolate-amines (H2L1, H2L4 and H2L9), together with seven more already related published ligands, were synthesized, and characterized. With these ligands, two new dinuclear doubly-bridged-phenoxido copper(II) complexes (3, 4), and six more complexes (1, 2, 5–8), a new trinuclear complex (9) with an alternative doubly-bridged-phenoxido and –methoxido, as well as the 1D polymer (10) were synthesized, and their molecular structures were characterized by spectroscopic methods and X-ray single crystal crystallography. The Cu(II) centers in these complexes exhibit distorted square-pyramidal arrangement in 1–4, mixed square pyramidal and square planar in 5, 6, and 9, and distorted octahedral (5+1) arrangements in 7 and 8. The temperature dependence magnetic susceptibility study over the temperature range 2–300 K revealed moderate–relatively strong antiferromagnetic coupling (AF) (|J| = 289–145 cm−1) in complexes 1–6, weak-moderate AF (|J| = 59 cm−1) in the trinuclear complex 9, but weak AF interactions (|J| = 3.6 & 4.6 cm−1) were obtained in 7 and 8. No correlation was found between the exchange coupling J and the geometrical structural parameters of the four-membered Cu2O2 rings.
Collapse
|
3
|
Synthetic methodology, structures and properties of mixed valence copper(I/II) complexes with various Schiff bases and their reduced analogues. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
4
|
Suzuki T, Sato A, Oshita H, Yajima T, Tani F, Abe H, Mieda-Higa K, Yanagisawa S, Ogura T, Shimazaki Y. Formation of Ni(II)-phenoxyl radical complexes by O 2: a mechanistic insight into the reaction of Ni(II)-phenol complexes with O 2. Dalton Trans 2021; 50:5161-5170. [PMID: 33881085 DOI: 10.1039/d1dt00105a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A reaction of Ni(ClO4)2·6H2O with a tripodal ligand having two di(tert-butyl)phenol moieties, H2tbuL, and 1 equivalent of triethylamine in CH2Cl2/CH3OH (1 : 1, v/v) under N2 gave a NiII-(phenol)(phenolate) complex, [Ni(HtbuL)(CH3OH)2]ClO4. The formation of the NiII-phenoxyl radical complex by O2 was observed in the reaction of this complex in the solid state. On the other hand, the NiII-phenoxyl radical complex [Ni(Me2NL)(CH3OH)2]ClO4 was obtained by the reaction of H2Me2NL having a p-(dimethylamino)phenol moiety with Ni(ClO4)2·6H2O in a similar procedure under O2, through the oxidation of the NiII-(phenol)(phenolate) complex. However, a direct redox reaction of the NiII ion could not be detected in the phenoxyl radical formation. The results of the reaction kinetics, XAS and X-ray structure analyses suggested that the O2 oxidation from the NiII-(phenol)(phenolate) complex to the NiII-phenoxyl radical complex occurs via the proton transfer-electron transfer (PT-ET) type mechanism of the phenol moiety weakly coordinated to the nickel ion.
Collapse
Affiliation(s)
- Takashi Suzuki
- Graduate School of Science and Engineering, Ibaraki University, Mito 310-8512, Japan.
| | - Akari Sato
- Graduate School of Science and Engineering, Ibaraki University, Mito 310-8512, Japan.
| | - Hiromi Oshita
- Faculty of Chemistry of Functional Molecules, Konan University, Higashinada-ku, Kobe 658-8501, Japan
| | - Tatsuo Yajima
- Faculty of Chemistry, Materials and Bioengineering, Kansai University, Suita, Osaka 564-8680, Japan
| | - Fumito Tani
- Institute for Materials Chemistry and Engineering, Kyushu University, Nishi-Ku, Fukuoka 819-0395, Japan
| | - Hitoshi Abe
- Graduate School of Science and Engineering, Ibaraki University, Mito 310-8512, Japan. and Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK) 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan and Department of Materials Structure Science, School of High Energy Accelerator Science, SOKENDAI (the Graduate University for Advanced Studies), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
| | - Kaoru Mieda-Higa
- Graduate School of Life Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
| | - Sachiko Yanagisawa
- Graduate School of Life Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
| | - Takashi Ogura
- Graduate School of Life Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
| | - Yuichi Shimazaki
- Graduate School of Science and Engineering, Ibaraki University, Mito 310-8512, Japan.
| |
Collapse
|
5
|
Agarwal P, Kumar A, Richa, Verma I, Erande RD, Kłak J, Mota AJ, Arora H, Rajput A. The reversible inter-conversion of copper( ii) dimers bearing phenolate-based ligands in their monomers: theoretical and experimental viewpoints. NEW J CHEM 2021. [DOI: 10.1039/d0nj00484g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The conversion of the studied dimers into their monomers by an acid and the regeneration of the dimeric core from the monomer by a base is rationalized.
Collapse
Affiliation(s)
- Pratibha Agarwal
- School of Engineering and Sciences
- G. D. Goenka University
- Gurugram
- India
| | - Akhilesh Kumar
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
- Department of Chemistry
| | - Richa
- School of Engineering and Sciences
- G. D. Goenka University
- Gurugram
- India
| | - Indresh Verma
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208016
- India
| | - Rohan D. Erande
- Department of Chemistry
- Indian Institute of Technology Jodhpur
- Jodhpur 342037
- India
| | - Julia Kłak
- Faculty of Chemistry
- University of Wroclaw
- Wroclaw 50-383
- Poland
| | - Antonio J. Mota
- Department of Inorganic Chemistry
- Faculty of Science
- University of Granada
- Granada
- Spain
| | - Himanshu Arora
- School of Engineering and Sciences
- G. D. Goenka University
- Gurugram
- India
| | - Amit Rajput
- School of Engineering and Sciences
- G. D. Goenka University
- Gurugram
- India
| |
Collapse
|
6
|
Kunert R, Philouze C, Berthiol F, Jarjayes O, Storr T, Thomas F. Distorted copper(ii) radicals with sterically hindered salens: electronic structure and aerobic oxidation of alcohols. Dalton Trans 2020; 49:12990-13002. [PMID: 32909589 DOI: 10.1039/d0dt02524k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The sterically hindered salen ligands featuring biphenyl and tetramethyl putrescine linkers were synthesized and chelated to copper. The resulting complexes CuLbp,tBu, CuLbp,OMe, CuLpu,tBu and CuLpu,OMe were structurally characterized, showing a significanty tetrahedrally distorted metal center. The complexes show two reversible oxidation waves in the range 0.2 to 0.8 V vs. Fc+/Fc. A further reduction wave is detected in the range -1.4 to -1.7 V vs. Fc+/Fc. It is reversible for CuLbp,tBu and CuLbp,OMe and assigned to the CuII/CuI redox couple. One-electron oxidation of CuLbp,OMe, CuLpu,tBu and CuLpu,OMe was performed chemically and electrochemically. It is accompanied by a quenching of the EPR resonances. Phenoxyl radical formation was established by X-Ray diffraction on the cations [CuLbp,OMe]+ and [CuLpu,OMe]+, whereby the coordination sphere is elongated upon oxidation with quinoidal distributions of bond distances. The cations exhibit a NIR band of moderate intensity in their optical spectrum, supporting their classification as class II mixed-valent radical species according to the Robin Day classification. The proposed electronic structures are supported by DFT calculations. The cations [CuLbp,OMe]+, [CuLpu,tBu]+ and [CuLpu,OMe]+ were active towards aerobic oxidation of the unactivated alcohol 2-phenylethanol, with TON numbers up to 58 within 3 h.
Collapse
Affiliation(s)
- R Kunert
- Univ. Grenoble Alpes, CNRS, DCM, 38000 Grenoble, France.
| | | | | | | | | | | |
Collapse
|
7
|
Kundu BK, Ranjan R, Mukherjee A, Mobin SM, Mukhopadhyay S. Mannich base Cu(II) complexes as biomimetic oxidative catalyst. J Inorg Biochem 2019; 195:164-173. [PMID: 30954693 DOI: 10.1016/j.jinorgbio.2019.03.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/23/2019] [Accepted: 03/28/2019] [Indexed: 11/16/2022]
Abstract
Galactose Oxidase (GOase) and catechol oxidase (COase) are the metalloenzymes of copper having monomeric and dimeric sites of coordination, respectively. This paper summarizes the results of our studies on the structural, spectral and catalytic properties of new mononuclear copper (II) complexes [CuL(OAc)] (1), and [CuL2] (2), (HL = 2,4‑dichloro‑6‑{[(2'‑dimethyl‑aminoethyl)methylamino]methyl}‑phenol) which can mimic the functionalities of the metalloenzymes GOase and COase. The structure of the compounds has been elucidated by X-ray crystallography and the mimicked Cu(II) catalysts were further characterized by EPR. These mimicked models were used for GOase and COase catalysis. The GOase catalytic results were identified by GC-MS and, analyzed by HPLC at room temperature. The conversion of benzyl alcohol to benzaldehyde were significant in presence of a strong base, Bu4NOMe in comparison to the neutral medium. Apart from that, despite of being monomeric in nature, both the homogeneous catalysts are very prone to participate in COase mimicking oxidation reaction. Nevertheless, during COase catalysis, complex 1 was found to convert 3,5‑ditertarybutyl catechol (3,5-DTBC) to 3,5‑ditertarybutyl quinone (3,5-DTBQ) having greater rate constant, kcat or turn over number (TON) value over complex 2. The generation of reactive intermediates during COase catalysis were accounted by electrospray ionization mass spectrometry (ESI-MS). Through mechanistic approach, we found that H2O2 is the byproduct for both the GOase and COase catalysis, thus, confirming the generation of reactive oxygen species during catalysis. Notably, complex 1 having mono-ligand coordinating atmosphere has superior catalytic activity for both cases in comparison to complex 2, that is having di-ligand environment.
Collapse
Affiliation(s)
- Bidyut Kumar Kundu
- Discipline of Chemistry, School of Basic Sciences, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India
| | - Rishi Ranjan
- Discipline of Chemistry, School of Basic Sciences, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India
| | | | - Shaikh M Mobin
- Discipline of Chemistry, School of Basic Sciences, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India
| | - Suman Mukhopadhyay
- Discipline of Chemistry, School of Basic Sciences, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India; Discipline of Biosciences and Biomedical Engineering, School of Engineering, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, India.
| |
Collapse
|
8
|
Molloy JK, Fedele L, Jarjayes O, Philouze C, Imbert D, Thomas F. Structural and spectroscopic investigations of redox active seven coordinate luminescent lanthanide complexes. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.08.054] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
9
|
Colomban C, Philouze C, Molton F, Leconte N, Thomas F. Copper(II) complexes of N3O ligands as models for galactose oxidase: Effect of variation of steric bulk of coordinated phenoxyl moiety on the radical stability and spectroscopy. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.09.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
10
|
Affiliation(s)
- Paolo Pirovano
- School of Chemistry and CRANN/AMBER Nanoscience Institute; Trinity College Dublin; The University of Dublin; College Green 2 Dublin Ireland
| | - Aidan R. McDonald
- School of Chemistry and CRANN/AMBER Nanoscience Institute; Trinity College Dublin; The University of Dublin; College Green 2 Dublin Ireland
| |
Collapse
|
11
|
Rajput A, Kumar A, Sengupta A, Tyagi P, Arora H. Copper ( ii) dimers stabilized by bis(phenol) amine ligands: theoretical and experimental insights. NEW J CHEM 2018. [DOI: 10.1039/c8nj02591f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Comparative structural and magnetic studies on the binuclear Cu complexes of 1L(2−)/2L(2−) have been done and their electronic structures and observed electronic transitions (DFT and TD-DFT calculations) rationalized. The dimer complex can be converted into the corresponding monomeric Cu(ii) complex, [1L2CuII2(X)] (X = py), by adding an exogenous ligand such as pyridine (py).
Collapse
Affiliation(s)
- Amit Rajput
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208 016
- India
- Department of Basic and Applied Sciences
| | - Akhilesh Kumar
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208 016
- India
| | - Arunava Sengupta
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208 016
- India
| | - Priyanka Tyagi
- Department of Basic and Applied Sciences
- School of Engineering
- G. D. Goenka University
- Gurugram 122103
- India
| | - Himanshu Arora
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur 208 016
- India
- Department of Basic and Applied Sciences
| |
Collapse
|
12
|
Molloy JK, Philouze C, Fedele L, Imbert D, Jarjayes O, Thomas F. Seven-coordinate lanthanide complexes with a tripodal redox active ligand: structural, electrochemical and spectroscopic investigations. Dalton Trans 2018; 47:10742-10751. [DOI: 10.1039/c8dt01165f] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One-electron oxidation of the lanthanide complexes affords phenoxyl radical species. Radical formation is accompanied by a quenching of the metal-based luminescence.
Collapse
Affiliation(s)
- Jennifer K. Molloy
- Département de Chimie Moléculaire
- Univ. Grenoble Alpes
- UMR-5250 CNRS UGA
- 38058 Grenoble Cedex 9
- France
| | - Christian Philouze
- Département de Chimie Moléculaire
- Univ. Grenoble Alpes
- UMR-5250 CNRS UGA
- 38058 Grenoble Cedex 9
- France
| | - Lionel Fedele
- Département de Chimie Moléculaire
- Univ. Grenoble Alpes
- UMR-5250 CNRS UGA
- 38058 Grenoble Cedex 9
- France
| | - Daniel Imbert
- Univ. Grenoble Alpes
- CNRS
- CEA
- INAC-SyMMES
- 38000 Grenoble
| | - Olivier Jarjayes
- Département de Chimie Moléculaire
- Univ. Grenoble Alpes
- UMR-5250 CNRS UGA
- 38058 Grenoble Cedex 9
- France
| | - Fabrice Thomas
- Département de Chimie Moléculaire
- Univ. Grenoble Alpes
- UMR-5250 CNRS UGA
- 38058 Grenoble Cedex 9
- France
| |
Collapse
|
13
|
Serre D, Erbek S, Berthet N, Ronot X, Martel-Frachet V, Thomas F. Copper(II) complexes of N 3O tripodal ligands appended with pyrene and polyamine groups: Anti-proliferative and nuclease activities. J Inorg Biochem 2017; 179:121-134. [PMID: 29222969 DOI: 10.1016/j.jinorgbio.2017.11.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 10/28/2017] [Accepted: 11/04/2017] [Indexed: 10/18/2022]
Abstract
A series of tripodal ligands based on the 2-tert-butyl-4-R-6-phenol was synthesized, where R=aldehyde (HL1), R=putrescine-pyrene (HL2) and R=putrescine (HL3). A dinucleating ligand wherein a putrescine group connects two tripodal moieties was also prepared (H2L4). The corresponding copper complexes (1, 2, 3, and 4, respectively) were prepared and characterized. We determined the phenol's pKas in the range 2.47-3.93. The DNA binding constants were determined at 6×106, 5.5×105 and 2.7×106 for 2, 3 and 4, respectively. The complexes display a metal-centered reduction wave at Epc,red=-0.45 to -0.5V vs. saturated calomel electrode, as well as a ligand-centered oxidation wave above 0.57V at pH7. In the presence of ascorbate they promote an efficient cleavage of DNA, with for example a concentration required to cleave 50% of supercoiled DNA of 1.7μM for 2. The nuclease activity is affected by the nature of the R group: putrescine-pyrene≈bis-ligating>putrescine>aldehyde. The species responsible for strand scission is the hydroxyl radical. The cytotoxicity of the complexes was evaluated on bladder cancer cell lines sensitive or resistant to cis-platin. The IC50 of complexes 2 and 4 span over a short range (1.3-2μM) for the two cell lines. They are lower than those of the other complexes (3.1-9.7μM) and cis-platin. The most active compounds block the cell cycle at the G0/1 phase and promote apoptosis.
Collapse
Affiliation(s)
- Doti Serre
- Département de Chimie Moléculaire, Université Grenoble Alpes, UMR-5250 CNRS UGA, CS 40700, 38058 Grenoble Cedex 9, France
| | - Sule Erbek
- EPHE, PSL Research University, IAB, INSERM UGA U1209 - CNRS UMR 5309, 38700 La Tronche, France
| | - Nathalie Berthet
- Département de Chimie Moléculaire, Université Grenoble Alpes, UMR-5250 CNRS UGA, CS 40700, 38058 Grenoble Cedex 9, France
| | - Xavier Ronot
- EPHE, PSL Research University, IAB, INSERM UGA U1209 - CNRS UMR 5309, 38700 La Tronche, France
| | | | - Fabrice Thomas
- Département de Chimie Moléculaire, Université Grenoble Alpes, UMR-5250 CNRS UGA, CS 40700, 38058 Grenoble Cedex 9, France.
| |
Collapse
|
14
|
Hossain MK, Schachner JA, Haukka M, Lehtonen A, Mösch-Zanetti NC, Nordlander E. Dioxidomolybdenum(VI) and -tungsten(VI) complexes with tripodal amino bisphenolate ligands as epoxidation and oxo-transfer catalysts. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.04.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
15
|
Zhan G, Zhong W, Wei Z, Liu Z, Liu X. Roles of phenol groups and auxiliary ligand of copper(ii) complexes with tetradentate ligands in the aerobic oxidation of benzyl alcohol. Dalton Trans 2017. [DOI: 10.1039/c7dt01716b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Mimics structurally assembled to form the metal center of GOase. The phenol group(s) and substituent (R) and the auxiliary ligand (L) of the mimics significantly affect catalysis during the aerobic oxidation of benzyl alcohol.
Collapse
Affiliation(s)
- Guangli Zhan
- School of Chemistry
- Nanchang University
- Nanchang
- China
| | - Wei Zhong
- College of Biological
- Chemical Sciences and Engineering
- Jiaxing University
- Jiaxing
- China
| | - Zhenhong Wei
- School of Chemistry
- Nanchang University
- Nanchang
- China
| | - Zhenzhen Liu
- School of Chemistry
- Nanchang University
- Nanchang
- China
| | - Xiaoming Liu
- College of Biological
- Chemical Sciences and Engineering
- Jiaxing University
- Jiaxing
- China
| |
Collapse
|
16
|
Wilting A, Kügler M, Siewert I. Copper Complexes with NH-Imidazolyl and NH-Pyrazolyl Units and Determination of Their Bond Dissociation Gibbs Energies. Inorg Chem 2016; 55:1061-8. [DOI: 10.1021/acs.inorgchem.5b02084] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexander Wilting
- Georg-August-University Göttingen, Tammannstr. 4, D-37077 Göttingen, Germany
| | - Merle Kügler
- Georg-August-University Göttingen, Tammannstr. 4, D-37077 Göttingen, Germany
| | - Inke Siewert
- Georg-August-University Göttingen, Tammannstr. 4, D-37077 Göttingen, Germany
| |
Collapse
|
17
|
de Bellefeuille D, Orio M, Barra AL, Aukauloo A, Journaux Y, Philouze C, Ottenwaelder X, Thomas F. Redox Noninnocence of the Bridge in Copper(II) Salophen and Bis(oxamato) Complexes. Inorg Chem 2015; 54:9013-26. [DOI: 10.1021/acs.inorgchem.5b01285] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- David de Bellefeuille
- Department
of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Maylis Orio
- Laboratoire
de Spectrochimie Infrarouge et Raman, Université des Sciences et Technologies de Lille, UMR CNRS 8516, 59655 Villeneuve
d’Ascq Cedex, France
| | - Anne-Laure Barra
- Laboratoire National des Champs Magnétiques Intenses, CNRS, 25 rue des Martyrs, 38042 Grenoble, France
| | - Ally Aukauloo
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
UMR CNRS 8182, Université Paris-Sud XI, 91405 Orsay, France
- Service de Bioénergétique,
Biologie Structurale et Mécanismes (SB2SM), CEA, iBiTec-S;
Biochimie Biophysique et Biologie Structurale (B3S),
I2BC, UMR 9198, 91191 Gif-sur-Yvette, France
| | - Yves Journaux
- Institut
de Chimie Moléculaire et des Matériaux d’Orsay,
UMR CNRS 8182, Université Paris-Sud XI, 91405 Orsay, France
- Sorbonne Universités,
UPMC Université Paris 06, UMR CNRS 8232, Institut
Parisien de Chimie Moléculaire, France
| | - Christian Philouze
- Equipe
CIRE, Département de Chimie Moléculaire, UMR CNRS 5250, Université Grenoble-Alpes, 38041 Grenoble Cedex 9, France
| | - Xavier Ottenwaelder
- Department
of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Fabrice Thomas
- Equipe
CIRE, Département de Chimie Moléculaire, UMR CNRS 5250, Université Grenoble-Alpes, 38041 Grenoble Cedex 9, France
| |
Collapse
|
18
|
Aotake T, Suzuki M, Aratani N, Yuasa J, Kuzuhara D, Hayashi H, Nakano H, Kawai T, Wu J, Yamada H. 9,9′-Anthryl-anthroxyl radicals: strategic stabilization of highly reactive phenoxyl radicals. Chem Commun (Camb) 2015; 51:6734-7. [DOI: 10.1039/c4cc10104a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stable anthroxyl radical with a half-life over 10 days in solution.
Collapse
Affiliation(s)
- Tatsuya Aotake
- Graduate School of Materials Science
- Nara Institute of Science and Technology (NAIST)
- 8916-5 Takayama-cho
- Japan
| | - Mitsuharu Suzuki
- Graduate School of Materials Science
- Nara Institute of Science and Technology (NAIST)
- 8916-5 Takayama-cho
- Japan
| | - Naoki Aratani
- Graduate School of Materials Science
- Nara Institute of Science and Technology (NAIST)
- 8916-5 Takayama-cho
- Japan
| | - Junpei Yuasa
- Graduate School of Materials Science
- Nara Institute of Science and Technology (NAIST)
- 8916-5 Takayama-cho
- Japan
| | - Daiki Kuzuhara
- Graduate School of Materials Science
- Nara Institute of Science and Technology (NAIST)
- 8916-5 Takayama-cho
- Japan
| | - Hironobu Hayashi
- Graduate School of Materials Science
- Nara Institute of Science and Technology (NAIST)
- 8916-5 Takayama-cho
- Japan
| | - Haruyuki Nakano
- Department of Chemistry
- Graduate School of Sciences
- Kyushu University
- Fukuoka 812-8581
- Japan
| | - Tsuyoshi Kawai
- Graduate School of Materials Science
- Nara Institute of Science and Technology (NAIST)
- 8916-5 Takayama-cho
- Japan
| | - Jishan Wu
- National University of Singapore
- 3 Science Drive 3
- Singapore
| | - Hiroko Yamada
- Graduate School of Materials Science
- Nara Institute of Science and Technology (NAIST)
- 8916-5 Takayama-cho
- Japan
- CREST
| |
Collapse
|
19
|
Kochem A, Carrillo A, Philouze C, van Gastel M, du Moulinet d'Hardemare A, Thomas F. Copper(II)‐Coordinated α‐Azophenols: Effect of the Metal‐Ion Geometry on Phenoxyl/Phenolate Oxidation Potential and Reactivity. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402312] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Amélie Kochem
- Université Grenoble Alpes, Département de Chimie Moléculaire, UMR CNRS 5250, BP 53, 38041 Grenoble Cedex 9, France, http://dcm.ujf‐grenoble.fr
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34‐36, 45470 Mülheim an der Ruhr, Germany, http://www.cec.mpg.de
| | - Alexandre Carrillo
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34‐36, 45470 Mülheim an der Ruhr, Germany, http://www.cec.mpg.de
| | - Christian Philouze
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34‐36, 45470 Mülheim an der Ruhr, Germany, http://www.cec.mpg.de
| | - Maurice van Gastel
- Université Grenoble Alpes, Département de Chimie Moléculaire, UMR CNRS 5250, BP 53, 38041 Grenoble Cedex 9, France, http://dcm.ujf‐grenoble.fr
| | - Amaury du Moulinet d'Hardemare
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34‐36, 45470 Mülheim an der Ruhr, Germany, http://www.cec.mpg.de
| | - Fabrice Thomas
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34‐36, 45470 Mülheim an der Ruhr, Germany, http://www.cec.mpg.de
| |
Collapse
|
20
|
Wendt F, Rolff M, Thimm W, Näther C, Tuczek F. A Small-molecule Model System of Galactose Oxidase: Geometry, Reactivity, and Electronic Structure. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300475] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
21
|
Arion VB, Platzer S, Rapta P, Machata P, Breza M, Vegh D, Dunsch L, Telser J, Shova S, Mac Leod TCO, Pombeiro AJL. Marked Stabilization of Redox States and Enhanced Catalytic Activity in Galactose Oxidase Models Based on Transition Metal S-Methylisothiosemicarbazonates with −SR Group in Ortho Position to the Phenolic Oxygen. Inorg Chem 2013; 52:7524-40. [DOI: 10.1021/ic4004966] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vladimir B. Arion
- Institute
of Inorganic Chemistry, University of Vienna, Währinger Strasse
42, A-1090 Vienna, Austria
| | - Sonja Platzer
- Institute
of Inorganic Chemistry, University of Vienna, Währinger Strasse
42, A-1090 Vienna, Austria
| | - Peter Rapta
- Faculty of Chemical and Food Technology, Slovak University of Technology,
Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Peter Machata
- Faculty of Chemical and Food Technology, Slovak University of Technology,
Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Martin Breza
- Faculty of Chemical and Food Technology, Slovak University of Technology,
Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Daniel Vegh
- Faculty of Chemical and Food Technology, Slovak University of Technology,
Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Lothar Dunsch
- Centre of Spectroelectrochemistry,
Leibniz Institute of Solid State and Materials Research Dresden, Helmholtzstrasse
20, D-01069 Dresden, Germany
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt
University, 430 South Michigan Avenue, Chicago, Illinois 60605, United
States
| | - Sergiu Shova
- “Petru Poni”
Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A,
700487 Iasi, Romania
| | - Tatiana C. O. Mac Leod
- Centro de
Quimica Estrutural, Instituto Superior Técnico, Technical University
of Lisbon, Lisbon, Portugal
| | - Armando J. L. Pombeiro
- Centro de
Quimica Estrutural, Instituto Superior Técnico, Technical University
of Lisbon, Lisbon, Portugal
| |
Collapse
|
22
|
Shaffer KJ, Davidson RJ, Burrell AK, McCleskey TM, Plieger PG. Encapsulation of the BeII Cation: Spectroscopic and Computational Study. Inorg Chem 2013; 52:3969-75. [DOI: 10.1021/ic302770t] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Karl J. Shaffer
- Chemistry Institute of Fundamental Sciences, Massey University, Turitea Campus, Private Bag 11 222, Palmerston
North, New Zealand 4442
| | - Ross J. Davidson
- Chemistry Institute of Fundamental Sciences, Massey University, Turitea Campus, Private Bag 11 222, Palmerston
North, New Zealand 4442
| | - Anthony K. Burrell
- Chemistry Division MS J582, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - T. Mark McCleskey
- Chemistry Division MS J582, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Paul G. Plieger
- Chemistry Institute of Fundamental Sciences, Massey University, Turitea Campus, Private Bag 11 222, Palmerston
North, New Zealand 4442
| |
Collapse
|
23
|
Manzur J, Mora H, Paredes-García V, Vega A, Novak M. Effect of the counter-anion on the structural and magnetic properties of a copper(II) complex with 2-[(bis(2-pyridylmethyl)amino)methyl]-4-methyl-6-(methylthio)phenol. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.01.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
24
|
Cyclic dimers of variable size, formed from FeCu carbide clusters: Synthesis, structure and electrochemical behaviour of [{Fe4C(CO)12Cu2(μ-X)}2]n−, (X = phenylthiolate, pyrazolate, (n = 2) or diphenolate (n = 4)). J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.01.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
25
|
Synthesis, characterization and phosphotriesterase mimetic activity of some Zn(II) and Cu(II) complexes. J CHEM SCI 2013. [DOI: 10.1007/s12039-012-0331-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
26
|
Franks M, Gadzhieva A, Ghandhi L, Murrell D, Blake AJ, Davies ES, Lewis W, Moro F, McMaster J, Schröder M. Five Coordinate M(II)-Diphenolate [M = Zn(II), Ni(II), and Cu(II)] Schiff Base Complexes Exhibiting Metal- and Ligand-Based Redox Chemistry. Inorg Chem 2013; 52:660-70. [DOI: 10.1021/ic301731w] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Mark Franks
- School of
Chemistry, University of Nottingham, Nottingham
NG7 2RD, U.K
| | | | - Laura Ghandhi
- School of
Chemistry, University of Nottingham, Nottingham
NG7 2RD, U.K
| | - David Murrell
- School of
Chemistry, University of Nottingham, Nottingham
NG7 2RD, U.K
| | | | - E. Stephen Davies
- School of
Chemistry, University of Nottingham, Nottingham
NG7 2RD, U.K
| | - William Lewis
- School of
Chemistry, University of Nottingham, Nottingham
NG7 2RD, U.K
| | - Fabrizio Moro
- School of
Chemistry, University of Nottingham, Nottingham
NG7 2RD, U.K
| | - Jonathan McMaster
- School of
Chemistry, University of Nottingham, Nottingham
NG7 2RD, U.K
| | - Martin Schröder
- School of
Chemistry, University of Nottingham, Nottingham
NG7 2RD, U.K
| |
Collapse
|
27
|
Berthet N, Martel-Frachet V, Michel F, Philouze C, Hamman S, Ronot X, Thomas F. Nuclease and anti-proliferative activities of copper(ii) complexes of N3O tripodal ligands involving a sterically hindered phenolate. Dalton Trans 2013; 42:8468-83. [DOI: 10.1039/c3dt32659d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
28
|
Balaghi SE, Safaei E, Rafiee M, Kowsari MH. A chloro bridged Cu(II)–Cu(II) complex of a new aminophenol ligand: Magnetostructural, radical decay kinetic studies, highly efficient and aerial alcohol oxidation. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.07.096] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
29
|
Kochem A, Kanso H, Baptiste B, Arora H, Philouze C, Jarjayes O, Vezin H, Luneau D, Orio M, Thomas F. Ligand contributions to the electronic structures of the oxidized cobalt(II) salen complexes. Inorg Chem 2012; 51:10557-71. [PMID: 23013360 DOI: 10.1021/ic300763t] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Square planar cobalt(II) complexes of salen ligands N,N'-bis(3-tert-butyl-5R-salicylidene)-1,2-cyclohexanediamine), where R = OMe (1) and tert-butyl (2), were prepared. 1 and 2 were electrochemically reversibly oxidized into cations [1-H(2)O](+) and [2-H(2)O](+) in CH(2)Cl(2). The chemically generated [1-H(2)O](SbF(6))·0.68 H(2)O·0.82CH(2)Cl(2) and [2-H(2)O](SbF(6))·0.3H(2)O·0.85CH(2)Cl(2) were characterized by X-ray diffraction and NIR spectroscopy. Both complexes are paramagnetic species containing a square pyramidal cobalt ion coordinated at the apical position by an exogenous water molecule. They exhibit remarkable NIR bands at 1220 (7370 M(-1) cm(-1)) and 1060 nm (5560 M(-1) cm(-1)), respectively, assigned to a CT transition. DFT calculations and magnetic measurements confirm the paramagnetic (S = 1) ground spin state of the cations. They show that more than 70% of the total spin density in [1-H(2)O](+) and [2-H(2)O](+) is localized on the metal, the remaining spin density being distributed over the aromatic rings (30% phenoxyl character). In the presence of N-methylimidazole 1 and 2 are irreversibly oxidized by air into the genuine octahedral cobalt(III) bis(phenolate) complexes [1-im(2)](+) and [2-im(2)](+), the former being structurally characterized. Neither [1-im(2)](+) nor [2-im(2)](+) exhibits a NIR feature in its electronic spectrum. 1 and 2 were electrochemically two-electron oxidized into [1](2+) and [2](2+). The cations were identified as Co(III)-phenoxyl species by their characteristic absorption band at ca. 400 nm in the UV-vis spectrum. Coordination of the phenoxyl radical to the cobalt(III) metal ion is evidenced by the EPR signal centered at g = 2.00.
Collapse
Affiliation(s)
- Amélie Kochem
- Equipe de Chimie Inorganique Redox Biomimétique, Département de Chimie Moléculaire, Université Joseph Fourier, 38041 Grenoble Cedex 9, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Yang L, Chen W, Chen Y, Liu W, Lei T, Li L, Lin M, Wu J, Cao Y, Li W, Li Y. Copper(II) and Cadmium(II) Complexes Based on N, N-Bis(3, 5-dimethyl-2-hydroxybenzyl)- N-(2-pyridylmethyl)amine Ligand: Syntheses, Structures, Magnetic, and Luminescent Properties. Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201200244] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
31
|
Butsch K, Klein A, Nitsche S, Stirnat K, Hawkett JR, McInnes EJL, Bauer M. Generation and characterisation of the phenoxyl-radical containing Cu(II) complex [Cu(triaz)2]+ (triaz- = O,N chelating triazole-phenolate). Dalton Trans 2012; 41:11464-75. [PMID: 22895494 DOI: 10.1039/c2dt31369c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The new copper complex [Cu(triaz)(2)] (Htriaz = 2,4-di-(tert-butyl)-6-(5-chloro-2H-benzo[d][1,2,3]triazol-2-yl)phenol) was investigated in detail by single crystal XRD, EPR-, UV/Vis-absorption-, CV-, and spectroelectrochemistry. The oxidised species [Cu(triaz)(2)](+) was characterised by UV/Vis spectroelectrochemistry and contains a phenoxyl-radical bound to Cu(II). This quite stable species was chemically generated by two different methods: aerial oxidation of a Cu(I) precursor in the presence of Htriaz (and base) or from [Cu(triaz)(2)] by adding a Cu(II) salt (disproportionation). The efficiency for the latter reaction has been studied by UV/Vis spectroscopy, XAS and catalytic test reactions (oxidation of benzyl alcohol).
Collapse
Affiliation(s)
- Katharina Butsch
- Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie, Greinstrasse 6, D-50939 Köln, Germany
| | | | | | | | | | | | | |
Collapse
|
32
|
A sulfate-bridged CuII complex with 1-D helical-chain structure: Synthesis, structure and magnetic property. INORG CHEM COMMUN 2012. [DOI: 10.1016/j.inoche.2012.03.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
33
|
Wichmann O, Sillanpää R, Lehtonen A. Structural properties and applications of multidentate [O,N,O,X′] aminobisphenolate metal complexes. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2011.09.007] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
34
|
Dean RK, Fowler CI, Hasan K, Kerman K, Kwong P, Trudel S, Leznoff DB, Kraatz HB, Dawe LN, Kozak CM. Magnetic, electrochemical and spectroscopic properties of iron(iii) amine–bis(phenolate) halide complexes. Dalton Trans 2012; 41:4806-16. [DOI: 10.1039/c2dt12242a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
35
|
Synthesis, Structure, and C-C Cross-Coupling Activity of (Amine)bis(phenolato)iron(acac) Complexes. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100553] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
36
|
Synthesis and characterization of binuclear [ONXO]-type amine-bis(phenolate) copper(II) complexes. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.04.048] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
37
|
Uma Maheswari P, Hartl F, Quesada M, Buda F, Lutz M, Spek AL, Gamez P, Reedijk J. Spectro-electrochemical and DFT studies of a planar Cu(II)–phenolate complex active in the aerobic oxidation of primary alcohols. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.03.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
38
|
Mikata Y, Fujimoto T, Fujiwara T, Kondo SI. Intramolecular ether oxygen coordination in the zinc complexes with dipicolylamine (DPA)-derived ligands. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.02.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
39
|
Reckling AM, Martin D, Dawe LN, Decken A, Kozak CM. Structure and C–C cross-coupling reactivity of iron(III) complexes of halogenated amine-bis(phenolate) ligands. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2010.09.076] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
40
|
Biswas A, Saha R, Ghosh A. Two unusual mixed-valent trinuclear CuII2CuI complexes containing copper(i) tribromide dianion as bridging ligand: Identification of an unprecedented doubly hydrogen-bonded water dimer. CrystEngComm 2011. [DOI: 10.1039/c0ce00784f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
41
|
Safaei E, Kabir MM, Wojtczak A, Jagličić Z, Kozakiewicz A, Lee YI. Synthesis, crystal structure, magnetic and redox properties of copper(II) complexes of N-alkyl(aryl) tBu-salicylaldimines. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.11.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
42
|
Thomas F, Arora H, Philouze C, Jarjayes O. CoIII and CuII complexes of reduced Schiff bases: Generation of phenoxyl radical species. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.04.044] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
43
|
Safaei E, Wojtczak A, Bill E, Hamidi H. Synthesis, crystal structure, magnetic and redox properties of Cu(II)–Cu(II) binuclear complexes of bis(phenol) amine ligands. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.06.025] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
44
|
Orio M, Philouze C, Jarjayes O, Neese F, Thomas F. Spin interaction in octahedral zinc complexes of mono- and diradical Schiff and mannich bases. Inorg Chem 2010; 49:646-58. [PMID: 20000450 DOI: 10.1021/ic901846u] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The four Schiff bases 2-tert-butyl-4-methoxy-6-[(pyridin-2-ylmethylimino)methyl]phenol, 2,4-di-tert-butyl-6-[(pyridin-2-ylmethylimino)methyl]phenol, 2-tert-butyl-4-methoxy-6-(quinolin-8-yliminomethyl)phenol, and 2,4-di-tert-butyl-6-(quinolin-8-yliminomethyl)phenol) as well as one Mannich base, N,N',N,N'-bis[(2-hydroxy-3,5-di-tert-butylbenzyl)(2-pyridylmethyl)]ethylenediamine, and their zinc bis-phenolate complexes 1-5, respectively, have been prepared. The complexes 4 and 5 have been characterized by X-ray diffraction crystallography, showing a zinc ion within an octahedral environment, with a cis orientation of the phenolate moieties. 1-5 exhibit in their cyclic voltammetry curves two anodic reversible waves attributable to the successive oxidation of the phenolates into phenoxyl radicals. Bulk electrolysis at ca. +0.1 V affords the zinc-coordinated monophenoxyl radical species (1(*))(+)-(5(*))(+) characterized by UV-vis absorption bands at 400-440 nm. The more stable radicals are (3(*))(+) and (4(*))(+) (half-life higher than 90 min at 298 K), likely due to the increased charge delocalization within the quinoline moieties. These species exhibit a significant additional near-IR band (epsilon > 1650 M(-1) cm(-1)) attributed to a CT transition. In the two-electron-oxidized species (1(**))(2+)-(5(**))(2+) the radical spins present a weak magnetic coupling. EPR reveals an antiferromagnetic exchange interaction for (1(**))(2+)-(4(**))(2+), whereas an unusual ferromagnetic exchange coupling is operative in (5(**))(2+). The weak magnitude of experimental |J| values (within the 1-5 cm(-1) range) as well as their sign could be well reproduced by DFT calculations at the B3LYP level. The small energy gap between the ground and the first excited spin states allows us to investigate the zero-field splitting (ZFS) of the triplet by EPR spectroscopy. This parameter is found to be axial for all systems, with |D| values of 0.0163 cm(-1) for (1(**))(2+), 0.0182 cm(-1) for (2(**))(2+), 0.0144 cm(-1) for (3(**))(2+), 0.0160 cm(-1) for (4(**))(2+), and 0.0115 cm(-1) for (5(**))(2+). The trend between experimental ZFS is confirmed by DFT calculations, which give further insight regarding its sign (negative for all the compounds). Lower ZFS values are obtained for (2(**))(2+) compared to (1(**))(2+) (and also for (4(**))(2+) compared to (3(**))(2+)), which can be interpreted by an increased delocalization of the spin density over the methoxy para substituent. Significant spin population on the quinoline also contributes to a lowering of the |D| value, as observed when (3(**))(2+) is compared to (1(**))(2+) (and also when (4(**))(2+) is compared to (2(**))(2+)).
Collapse
Affiliation(s)
- M Orio
- Institute for Physical and Theoretical Chemistry, Universität Bonn, Wegelerstrasse 12, D-53113 Bonn, Germany
| | | | | | | | | |
Collapse
|
45
|
Mukherjee A, Lloret F, Mukherjee R. Diphenoxido‐Bridged Co
II
and Zn
II
Complexes of Tripodal N
2
O
2
Ligands: Stabilisation of M
II
‐Coordinated Phenoxyl Radical Species. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200900760] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Atasi Mukherjee
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India, Fax: +91‐512‐2597437
| | - Francesc Lloret
- Departament de Química Inorgànica, Instituto de Ciencia Molecular (ICMOL), Universitat de València, Polígono de la Coma, s/n, 46980 Paterna, València, Spain
| | - Rabindranath Mukherjee
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India, Fax: +91‐512‐2597437
| |
Collapse
|
46
|
Wong YL, Tong LH, Dilworth JR, Ng DKP, Lee HK. New dioxo–molybdenum(vi) and –tungsten(vi) complexes with N-capped tripodal N2O2 tetradentate ligands: Synthesis, structures and catalytic activities towards olefin epoxidation. Dalton Trans 2010; 39:4602-11. [DOI: 10.1039/b926864b] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
47
|
Dean RK, Granville SL, Dawe LN, Decken A, Hattenhauer KM, Kozak CM. Structure and magnetic behaviour of mono- and bimetallic chromium(iii) complexes of amine-bis(phenolate) ligands. Dalton Trans 2010:548-59. [DOI: 10.1039/b910254j] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
48
|
Das UK, Bobak J, Fowler C, Hann SE, Petten CF, Dawe LN, Decken A, Kerton FM, Kozak CM. Synthesis and structure of mono-, bi- and trimetallic amine-bis(phenolate) cobalt(ii) complexes. Dalton Trans 2010; 39:5462-77. [DOI: 10.1039/c002843f] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
49
|
Manzur J, Mora H, Vega A, Venegas-Yazigi D, Novak MA, Sabino JR, Paredes-García V, Spodine E. Mononuclear and Polynuclear Copper(II) Complexes Derived from Pyridylalkylaminomethylphenol Polypodal Ligands. Inorg Chem 2009; 48:8845-55. [PMID: 19747001 DOI: 10.1021/ic901026x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jorge Manzur
- Departamento de Ciencia de los Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Tupper 2069, Santiago, Chile
| | - Hector Mora
- Departamento de Ciencia de los Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Tupper 2069, Santiago, Chile
| | - Andrés Vega
- Departamento de Ciencias Químicas, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 275, Santiago, Chile
| | - Diego Venegas-Yazigi
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Avenida L. B. O’Higgins 3363, Casilla 40-Correo 33, Santiago, Chile
| | - Miguel A. Novak
- Instituto de Física, Universidade Federal do Rio de Janeiro, BR-21945970, RJ, Brazil
| | | | - Verónica Paredes-García
- Departamento de Química, Universidad Tecnológica Metropolitana, Avenida José Pedro Alessandri 1242, Santiago, Chile
| | - Evgenia Spodine
- Departamento de Química Inorgánica y Analítica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Sergio Livingstone 1007, Santiago, Chile
| |
Collapse
|
50
|
Shimazaki Y, Takani M, Yamauchi O. Metal complexes of amino acids and amino acid side chain groups. Structures and properties. Dalton Trans 2009:7854-69. [PMID: 19771344 DOI: 10.1039/b905871k] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|