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Issue 33, 2007
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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

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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

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Publication details

The article was received on 15 Feb 2007, accepted on 24 May 2007 and first published on 27 Jun 2007


Article type: Paper
DOI: 10.1039/B702427D
Citation: Dalton Trans., 2007, 3646-3652
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    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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