N-Heterocyclic carbene bonding to cobalt porphyrin complexes

被引：33

作者：

Albrecht, Martin ^{[1
]}

Maji, Pathik ^{[1
]}

Haeusl, Christina ^{[1
]}

Monney, Angele ^{[1
]}

Mueller-Bunz, Helge ^{[1
]}

机构：

[1] Univ Coll Dublin, Sch Chem & Chem Biol, Dublin 4, Ireland

来源：

INORGANICA CHIMICA ACTA | 2012年 / 380卷

基金：

欧洲研究理事会; 瑞士国家科学基金会;

关键词：

Cobalt; N-Heterocyclic carbene; Porphyrin; Imidazole; Steric strain; Ligand substitution; TRANSITION-METAL COMPLEXES; STABLE CARBENES; CO-59; NMR; COORDINATION CHEMISTRY; MOLECULAR-STRUCTURE; CRYSTAL-STRUCTURES; NICKEL-COMPLEXES; IRON COMPLEXES; LIGAND; IMIDAZOLE;

D O I：

10.1016/j.ica.2011.08.039

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

N-Heterocyclic carbene (NHC) coordination to a cobalt(III) center embedded in a porphyrin scaffold has been accomplished by decarboxylation from N,N'-dimethylimidazolium-2-carboxylate in the presence of Co(TPP)Cl (TPP = 5,10,15,20-tetraphenylporphyrin). The distal chloride ligand in the resulting complex Co(NHC)(TPP)Cl was successfully substituted with imidazoles and alcohols. Single crystal X-ray diffraction of the latter complexes Co(NHC)(TPP)(ROH) (R = Me, Et) revealed a pronounced ruffling of the porphyrin macrocycle due to the two ortho methyl groups in the carbene ligand and because of the relatively short distance between the cobalt center and the carbene ligand. Spectroscopic investigations support a substantial porphyrin dearomatization upon NHC bonding. (C) 2011 Elsevier B. V. All rights reserved.

引用

页码：90 / 95

页数：6

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