Convenient syntheses of cyanuric chloride-derived NHC ligands, their Ag(I) and Au(I) complexes and antimicrobial activity

被引：22

作者：

Almalioti, Foteini ^{[1
]}

MacDougall, James ^{[1
]}

Hughes, Stephen ^{[1
]}

Hasson, Mohammed M. ^{[1
,4
]}

Jenkins, Robert L. ^{[1
]}

Ward, Benjamin D. ^{[1
]}

Tizzard, Graham J. ^{[2
]}

Coles, Simon J. ^{[2
]}

Williams, David W. ^{[3
]}

Bamford, Sarah ^{[3
]}

Fallis, Ian A. ^{[1
]}

Dervisi, Athanasia ^{[1
]}

机构：

[1] Cardiff Univ, Sch Chem, Cardiff CF10 3AT, S Glam, Wales

[2] Univ Southampton, UK Natl Crystallog Serv, Southampton SO17 1BJ, Hants, England

[3] Cardiff Univ, Sch Dent, Cardiff CF14 4XY, S Glam, Wales

[4] Al Mustansiriya Univ, Coll Sci, Dept Chem, Baghdad, Iraq

来源：

DALTON TRANSACTIONS | 2013年 / 42卷 / 34期

关键词：

CARBENE COMPLEXES; COORDINATION POLYMERS; PALLADIUM COMPLEXES; SILVER COMPLEXES; METAL-METAL; DERIVATIVES; GOLD(I); AG; ELECTROCHEMISTRY; LUMINESCENCE;

D O I：

10.1039/c3dt51400e

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Convenient syntheses of mono- and bis-imidazolium 1,3,5-triazine derivatives bearing piperidine and morpholine substituents are reported. In situ deprotonation of the mono-imidazolium salts and reaction with Ag2O or Au(tht)Cl (tht = tetrahydrothiophene) precursors affords the corresponding Ag(NHC) Cl and Au(NHC) Cl carbene complexes. In the presence of Ag(I) or Au(I) salts the bis-imidazolium pincers eliminate the imidazolium group to afford -OMe or -NMe2 substituted triazines depending on the solvent used. In solution, the Ag(I) and Au(I) complexes show a barrier to rotation about the C-triazine-N-amine bonds, with calculated Delta G(not equal) barriers in the region of 70 kJ mol(-1). Single crystal X-ray structures of several of the proligands and their corresponding Ag(I) and Au(I) complexes were obtained. These universally reveal an extended, rigidly planar pi-conjugated network between the triazine core, imidazolium/imidazolylidene substituents and exocyclic amine functions, to which the origin of the rotational barrier observed in solution is attributed. Only very weak N-triazine-metal interactions are observed in the solid state, as indicated by small deviations of the C-NHC-Ag-Cl bond angles from 180 degrees and also supported by DFT calculations on the Ag(NHC) Cl complex (NHC = 4,6-dipiperidinyl-2-methylimidazolylidene triazine). Preliminary antimicrobial susceptibility studies against five microorganisms (methicillin resistant Staphylococcus aureus NCTC 13277, S. aureus NCTC 6571, Pseudomonas aeruginosa NCTC 10662, Proteus mirabilis NCTC 11938 and Candida albicans ATCC 90028) show that the above triazine-based Ag-NHC complexes are active antimicrobial and antifungal agents.

引用

页码：12370 / 12380

页数：11

共 59 条

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