Issue 33, 2007

Synthesis, reaction and structure of a highly light-stable silver(i) cluster with an Ag4S4N4 core having a tridentate 4N-morpholyl 2-acetylpyridine thiosemicarbazoneligand: Use of water-soluble silver(i) carboxylates as a silver(i) source

Abstract

A novel neutral tetrameric silver(I) cluster [Ag(mtsc)]4 was obtained from reactions of a tridentate 4N-morpholyl 2-acetylpyridine thiosemicarbazone ligand (N′-[1-(2-pyridyl)ethylidene] morpholine-4-carbothiohydrazide, Hmtsc) and silver(I) sources containing Ag–O bonds (Ag2O, Ag(OAc), silver(I) 2-pyrrolidone-5-carboxylate {[Ag(Hpyrrld)]2}, silver(I) 5-oxo-2-tetrahydrofurancarboxylate {[Ag(othf)]2}, and silver(I) complexes with camphanic acid {[Ag(ca)]} and {[Ag(ca)(Hca)]}). The cluster was characterized by elemental analysis, TG/DTA, FTIR and single-crystal X-ray analysis in the solid state. The solution properties of the complexes were investigated using solution molecular weight measurement, ESI-MS and solution (1H, 13C and 31P) NMR spectroscopy. The obtained cluster is a novel example of a light-stable AgI cluster with a tridentate thiosemicarbazone ligand and the second report of a crystal structure of a thiosemicarbazone silver(I) complex. The reaction of the tetramer with a large excess of PPh3 gave dimeric complexes, namely, [Ag(µ(S)-mtsc)(PPh3)]2 and [(PPh3)2Ag(µ(S)-mtsc)2Ag]. The chloroform solution of the tetrameric complex showed modest and effective activities against selected bacteria (Bacillus subtilis, Staphylococcus aureus and Pseudomonas aeruginosa) and yeasts (Candida albicans and Saccharomyces cerevisiae), respectively, but it did not inhibit the growth of any selected microorganisms in a water-suspension system.

Graphical abstract: Synthesis, reaction and structure of a highly light-stable silver(i) cluster with an Ag4S4N4 core having a tridentate 4N-morpholyl 2-acetylpyridine thiosemicarbazone ligand: Use of water-soluble silver(i) carboxylates as a silver(i) source

Supplementary files

Article information

Article type
Paper
Submitted
15 Feb 2007
Accepted
24 May 2007
First published
27 Jun 2007

Dalton Trans., 2007, 3646-3652

Synthesis, reaction and structure of a highly light-stable silver(I) cluster with an Ag4S4N4 core having a tridentate 4N-morpholyl 2-acetylpyridine thiosemicarbazone ligand: Use of water-soluble silver(I) carboxylates as a silver(I) source

K. Onodera, N. C. Kasuga, T. Takashima, A. Hara, A. Amano, H. Murakami and K. Nomiya, Dalton Trans., 2007, 3646 DOI: 10.1039/B702427D

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