Synthesis and structures of monomeric [chloro(isatin-3-thiosemicarbazone)bis(triphenylphosphine)]copper(I) and dimeric [dichlorobis(thiophene-2-carbaldehyde thiosemicarbazone)bis(triphenylphosphine)]dicopper(I)] complexes |
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| Authors: | Tarlok S Lobana Rekha APS Pannu Geeta Hundal Ray J Butcher A Castineiras |
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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;3. Departamento De Quimica Inorganica, Facultad de Farmacia, Universidad de Santiago, 15782 Santiago, Spain |
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| Abstract: | Reaction of copper(I) chloride with thiophene-2-carbaldehyde thiosemicarbazone (Httsc) in acetonitrile in the presence of Ph3P yielded a sulfur-bridged dimer Cu2Cl2(μ2-S-Httsc)2(PPh3)2] · 2CH3CN (1), while a similar reaction with isatin-3-thiosemicarbazone (H2itsc) formed a monomer, CuCl(H2itsc)(Ph3P)2] · 2CH3CN (3). Furan-2-carbaldehyde thiosemicarbazone (Hftsc) also formed a compound of the composition Cu2Cl2(Hftsc)2(PPh3)2] · 2H2O (2). Complexes 1–3 have been characterized using elemental analysis, IR, 1H and 31P NMR spectroscopy and single crystal X-ray crystallography (1 and 3). Acetonitrile is engaged in hydrogen bonding with the chlorine atom {NCCH2–H?Cl)}, which is necessary for the stabilization of the bridging sulfur in 1. In compound 3, however, acetonitrile is strongly hydrogen bonded to the NH hydrogen of the isatin ring {CH3CN?NH(isatin)} and not to the chlorine atom. The Cu?Cu contact of 2.7719(5) Å in dimer 1 is close to twice the van der Waals radius of the Cu atom (2.80 Å). |
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| Keywords: | Copper(I) Thiophene-2-carbaldehyde thiosemicarbazone S-bridged dimer Isatin-3-thiosemicarbazone Furan-2-carbaldehyde thiosemicarbazone |
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