Imidazolate-bridged dinuclear copper(II) complex with new macrocyclic ligand bearing two 1H-imidazol-4-yl-pendants

Qi, Zhao‐Peng; Cai, Kai; Yuan, Qing; Okamura, Taka‐aki; Bai, Zhengshuai; Sun, Wei‐Yin; Ueyama, Norikazu

doi:10.1016/j.inoche.2010.04.010

Cited by 17 publications

(9 citation statements)

References 25 publications

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“…The solid was filtered and dried under vacuum until constant weight. Residual mass (%) at 700ºC: 88.2 (1@SBA-15); 95.0 (2@SBA-15); 84.7 (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). Cu wt %: 2.7 (1@SBA-15); 2.2 (2@SBA-15); 2.9 (3@SBA-15).…”

Section: Encapsulation Of Complexes 1 -3 In Mesoporous Sba-15 Silicamentioning

confidence: 99%

“…Therefore, efforts have been focused on the design of low molecular-weight antioxidant catalysts (SOD-mimics) as potential therapeutic agents with better bioavailability than exogenously administered SOD enzymes [9]. A number of heterodinuclear CuZn and homodinuclear Cu2 complexes have been evaluated as CuZn-SOD mimics [10][11][12][13][14][15][16][17]. For these complexes, kcat values are one or two orders of magnitude higher than for O2 •− self-disproportionation (kdisp = 5 x 10 5 M -1 s -1 , pH 7) [18].…”

Section: Introductionmentioning

confidence: 99%

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Biomimetic Cu, Zn and Cu2 complexes inserted in mesoporous silica as catalysts for superoxide dismutation

Patriarca

Daier

Camí

et al. 2019

Microporous and Mesoporous Materials

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Three CuZn-superoxide dismutase (SOD) functional mimics, [CuZn(dien)2(μ-Im)](ClO4)3 (1), [Cu2(dien)2(μ-Im)](ClO4)3 (2) (Im = imidazole, dien = diethylenetriamine), and [CuZn(salpn)Cl2] (3) (H2salpn = 1,3bis(salicylideneamino)propane), were successfully inserted into the nanochannels of SBA-15 type mesoporous silica with retention of the silica mesostructure. X-ray absorption spectroscopic studies indicate that the encapsulated complexes keep unchanged the first-shell environment of Cu(II) and Zn(II) ions. Magnetic measurements suggest that the nanochannels constrain the geometry of the µimidazolate-Cu(II)2 core modifying the relative orientation of the two copper coordination planes. Confinement imposed by the silica nanochannels upon encapsulation of complexes 1 and 2 leads to stable hybrid materials at physiological pH with enhanced SOD activity relative to the free complexes. Unlike the imidazolatobridged compounds, insertion of 3 in mesoporous silica leads to a less stable hybrid material exhibiting partial release into the aqueous solution and O2 •− dismutation rate slower than the free complex. The covalent binding of a mononuclear Cu(dien)Im + moiety to the mesoporous silica showed lower SOD activity than encapsulated imidazolato-bridged CuZn and Cu2 complexes. The results emphasize the positive effect of encapsulation on SOD activity of imidazolato-bridged dinuclear complexes.

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Section: Encapsulation Of Complexes 1 -3 In Mesoporous Sba-15 Silicamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biomimetic Cu, Zn and Cu2 complexes inserted in mesoporous silica as catalysts for superoxide dismutation

Patriarca

Daier

Camí

et al. 2019

Microporous and Mesoporous Materials

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“…The macrocyclic ligand L was synthesized as described previously. [8] Elemental analyses for C, H and N were made on a Perkin-Elmer 240C elemental analyzer. Infrared (IR) spectra were recorded on a Bruker Vector22 FT-IR spectrophotometer by using KBr pellets.…”

Section: Materials and Instrumentsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] In particular, the molecule/anion recognition has attracted increasing interest. [4][5][6][7][8] For example, we have reported several macrocyclic complexes, which could recognize and fix deprotonated imidazole molecule, and act as model compounds of Cu 2 Zn 2 -SOD. [7,8] In addtion, the linear azide anion is also extensively used in the self-assembly of complexes because of the various coordination modes and potential magnetic properties, etc.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8] For example, we have reported several macrocyclic complexes, which could recognize and fix deprotonated imidazole molecule, and act as model compounds of Cu 2 Zn 2 -SOD. [7,8] In addtion, the linear azide anion is also extensively used in the self-assembly of complexes because of the various coordination modes and potential magnetic properties, etc. [9,10] So, as an extension of our work, we introduce the azide anion into the system, and report herein a new dicopper complex [Cu 2 (L)(N 3 ) 2 ](ClO 4 ) 2 ·4H 2 O (1), and the properties.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Structure, and Properties of Dicopper Complex With Imidazole-Containing Polyamine Ligand

2015

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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A new dicopper complex [Cu 2 (L)(N 3 ) 2 ](ClO 4 ) 2 ·4H 2 O (1) with imidazole-containing macrocyclic polyamine ligand was synthesized, and characterized by elemental analysis, FT-IR, UV-Vis, TGA, single-crystal X-ray diffraction, and PXRD. Complex 1 crystallizes in monoclinic, space group P2 1 /c. The coordination geometry around Cu(II) atom is fivecoordinated distorted trigonal-bipyramid, and the imidazole-pendants, and the azide anions are located on the different sides of the macrocyclic ligand.

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pH‐Dependent Imidazolato Bridge Formation in Dicopper Complexes: Magnetic, Electrochemical, and Catalytic Repercussions

Monte‐Pérez

Sosa²,

Bernès

et al. 2012

Eur J Inorg Chem

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The dicopper complexes of two dinucleating ligands derived from 2-methylimidazole and 2 equiv. of an L-amino acid are presented (H 3 bphenim derived from L-phenylalanine and H 3 bleuim derived from L-leucine). For each ligand L, three different protonation states for the complex, Cu 2 HL 2+ , Cu 2 L + , and Cu 2 LOH, have been characterized in solution by potentiometric, spectrophotometric, and electrochemical techniques. X-ray diffraction studies enabled the characterization, in the solid state, of the [Cu 2 (bphenim)] + and [Cu 2 Hbleuim] 2+ cations. Magnetic measurements showed that while only a very slight coupling could be detected in [a]

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Imidazolate-bridged dinuclear copper(II) complex with new macrocyclic ligand bearing two 1H-imidazol-4-yl-pendants

Cited by 17 publications

References 25 publications

Biomimetic Cu, Zn and Cu2 complexes inserted in mesoporous silica as catalysts for superoxide dismutation

Biomimetic Cu, Zn and Cu2 complexes inserted in mesoporous silica as catalysts for superoxide dismutation

Synthesis, Structure, and Properties of Dicopper Complex With Imidazole-Containing Polyamine Ligand

pH‐Dependent Imidazolato Bridge Formation in Dicopper Complexes: Magnetic, Electrochemical, and Catalytic Repercussions

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