Copper Complexes with NH-Imidazolyl and NH-Pyrazolyl Units and Determination of Their Bond Dissociation Gibbs Energies.
Copper Complexes with NH-Imidazolyl and NH-Pyrazolyl Units and Determination of Their Bond Dissociation Gibbs Energies.
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具有 NH-咪唑基和 NH-吡唑基单元的铜配合物及其键解离吉布斯能的测定
DOI:
10.1021/acs.inorgchem.5b02084
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发表时间:
2016
影响因子:
4.6
通讯作者:
I. Siewert
中科院分区:
文献类型:
--
作者:
A. Wilting;M. Kügler;I. Siewert
We synthesized two dinuclear copper complexes, which have ionizableNimidazole andNpyrazole protons in the ligand, respectively, and determined the BDFE of the hypothetical H atom transfer reactions CuII(LH–1) + H•↔ CuI(L) in MeOH/H2O (BDFE: bond dissociation Gibbs (free) energy). The ligands have two adjacentN,N′,O-binding pockets, which differ in oneN-heterocycle: Lahas an imidazole unit and Lc, a pyrazole unit. The copper(II) complexes of Laand Lchave been characterized, and the substitution pattern has only little influence on the structural properties. The BDFEs of the hypothetical PCET reactions have been determined by means of the species distribution and the redox potentials of the involved species in MeOH/H2O (80/20 by weight). The pyrazole copper complex3exhibits a lower BDFE than the isoelectronic imidazole copper complex1(1, 292(3) kJ mol–1;3, 279(1) kJ mol–1). The difference is mainly caused by the higher acidity of theNpyrazole proton of3compared to theNimidazole proton of1. The redox potentials of1and3are very similar.
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