Synthesis,spectroscopy and structures of halogen and sulfur-bridged dinuclear silver(I) complexes with N1-substituted thiophene-2-carbaldehyde thiosemicarbazone |
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| Authors: | Tarlok S Lobana Rekha Sharma Ray J Butcher |
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| Institution: | 1. Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India;2. Department of Chemistry, Howard University, Washington, DC 20059, USA |
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| Abstract: | The reactions of silver(I) halides (Cl or Br) with thiophene-2-carbaldehyde N1-methyl thiosemicarbazone (HttscMe) in the presence of Ph3P (1:1:1 molar ratio) yield halogen-bridged dimers, Ag2(μ-X)2(η1-S-HttsMe)2(PPh3)2] (X = Cl, 1; Br, 2). The use of 2,2′-bipyridine in lieu of Ph3P in the reaction of silver(I) chloride with HttscMe yields the sulfur-bridged dimer, Ag2(μ-S-HttscMe)2(η1-HttsMe)2] · 2CHCl3 3. The substituents have altered the nature of bridge between the two silver atoms. The Ag···Ag separation (3.4867(5) Å) in complex 3 is less than that in the halogen-bridged dimers (3.734(4) Å 1; 3.746(5) Å 2). Unlike PPh3 the co-ligand 2,2′-bipyridine did not coordinate to the silver center, but was necessary for crystallization in the reaction with the thio-ligand. NMR spectroscopy revealed that the complexes remained unchanged in the solution state (CDCl3). |
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