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Schön F, Biebl F, Greb L, Leingang S, Grimm‐Lebsanft B, Teubner M, Buchenau S, Kaifer E, Rübhausen MA, Himmel H. On the Metal Cooperativity in a Dinuclear Copper–Guanidine Complex for Aliphatic C−H Bond Cleavage by Dioxygen. Chemistry 2019; 25:11257-11268. [DOI: 10.1002/chem.201901906] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Florian Schön
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Florian Biebl
- Institut für Nanostruktur- und FestkörperphysikUniversität Hamburg and Center for Free Electron Laser Science Luruper Chaussee 149 22761 Hamburg Germany
| | - Lutz Greb
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Simone Leingang
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Benjamin Grimm‐Lebsanft
- Institut für Nanostruktur- und FestkörperphysikUniversität Hamburg and Center for Free Electron Laser Science Luruper Chaussee 149 22761 Hamburg Germany
| | - Melissa Teubner
- Institut für Nanostruktur- und FestkörperphysikUniversität Hamburg and Center for Free Electron Laser Science Luruper Chaussee 149 22761 Hamburg Germany
| | - Sören Buchenau
- Institut für Nanostruktur- und FestkörperphysikUniversität Hamburg and Center for Free Electron Laser Science Luruper Chaussee 149 22761 Hamburg Germany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Michael A. Rübhausen
- Institut für Nanostruktur- und FestkörperphysikUniversität Hamburg and Center for Free Electron Laser Science Luruper Chaussee 149 22761 Hamburg Germany
| | - Hans‐Jörg Himmel
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
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Mandal S, Mukherjee J, Lloret F, Mukherjee R. Modeling tyrosinase and catecholase activity using new m-Xylyl-based ligands with bidentate alkylamine terminal coordination. Inorg Chem 2012. [PMID: 23194383 DOI: 10.1021/ic3013848] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chemical model systems possessing the reactivity aspects of both tyrosinase and catechol oxidase are presented. Using two m-xylyl-based ligands providing bidentate alkylamine terminal coordination, 1,3-bis[(N,N-dimethylaminoethyl)aminomethyl]benzene (L(H,H)) and 1,3-bis[(N,N,N'-trimethylaminoethyl)aminomethyl]benzene (L(Me,Me)), four new dicopper(I) complexes, [Cu(I)(2)(L(H,H))(MeCN)(4)][ClO(4)](2) (1), [Cu(I)(2)(L(H,H))(PPh(3))(2)(MeCN)(2)][ClO(4)](2) (2), [Cu(I)(2)(L(Me,Me))(MeCN)(2)][ClO(4)](2) (3), and [Cu(I)(2)(L(Me,Me))(PPh(3))(2)][ClO(4)](2) (4), have been synthesized and characterized. Complex 2 has been structurally characterized. Reaction of the dicopper(I) complex 3(2+) with dioxygen at 183 K generates putative bis(μ-oxo)dicopper(III) intermediate (absorption spectroscopy). Oxygenation of 1 and 3 brings about m-xylyl-ring hydroxylation (monooxygenase-like activity), with a noticeable color change from pale-yellow to dark green. The presence of phenoxo- and hydroxo-bridges in the end products [Cu(II)(2)(L(H,H)-O)(OH)(MeCN)(2)][ClO(4)](2) (5) and [Cu(II)(2)(L(Me,Me)-O)(OH)(OClO(3))][ClO(4)]·MeCN(6) has been authenticated by structural characterization. Oxygenation of 3 afforded not only the green complex 6 isolation but also a blue complex [Cu(II)(2)(L(Me,Me))(OH)(2)][ClO(4)](2) (7). Variable temperature magnetic susceptibility measurements on 5 and 6 establish that the Cu(II) centers are strongly antiferromagnetically coupled [singlet-triplet energy gap (J) = -528 cm(-1) (5) and -505 cm(-1) (6)]. The abilities of phenoxo- and hydroxo-bridged dicopper(II) complexes 5 and 6, the previously reported complex [Cu(II)(2)(L(1)-O)(OH)(OClO(3))(2)]·1.5H(2)O (8) (L(1)-OH = 1,3-bis[(2-dimethylaminoethyl)iminomethyl]phenol), and [Cu(II)(2)(L(2)-O)(OH)(OClO(3))()][ClO(4)]() (9) (L(2)-OH = 1,3-[(2-dimethylaminoethyl)iminomethyl][(N,N,N'-trimethyl)aminoethyl]-4-methylphenol) have been examined to catalyze the oxidation of catechol to quinone (catecholase activity of tyrosinase and catechol oxidase-like activity) by employing the model substrate 3,5-di-tert-butylcatechol. Saturation kinetic studies have been performed on these systems to arrive at the following reactivity order [k(cat)/K(M) (catalytic efficiency) × 10(-3) (M(-1) h(-1))]: 470 (6) > 367 (5) > 128 (9) > 90 (8).
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Affiliation(s)
- Sukanta Mandal
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India
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Matsumoto T, Ohkubo K, Honda K, Yazawa A, Furutachi H, Fujinami S, Fukuzumi S, Suzuki M. Aliphatic C−H Bond Activation Initiated by a (μ-η2:η2-Peroxo)dicopper(II) Complex in Comparison with Cumylperoxyl Radical. J Am Chem Soc 2009; 131:9258-67. [DOI: 10.1021/ja809822c] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takahiro Matsumoto
- Department of Chemistry, Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, and SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Kei Ohkubo
- Department of Chemistry, Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, and SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Kaoru Honda
- Department of Chemistry, Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, and SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Akiko Yazawa
- Department of Chemistry, Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, and SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Hideki Furutachi
- Department of Chemistry, Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, and SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Shuhei Fujinami
- Department of Chemistry, Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, and SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Shunichi Fukuzumi
- Department of Chemistry, Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, and SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Masatatsu Suzuki
- Department of Chemistry, Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, and SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
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