Two novel polymeric silver(I)–triphenylphosphine complexes with nitrogen-containing heterocycles, [Ag(1,2,3-L)(PPh3)2]n 3 and [Ag(1,2,4-L)(PPh3)2]n 4 (HL = triazole) were synthesized from reactions of polymeric precursors [Ag(1,2,3-L)]n 1 and [Ag(1,2,4-L)]n 2 with 3 equivalents of PPh3 in CH2Cl2, respectively. The polymeric precursors 1 and 2 have been obtained as non-crystalline, colorless powder-solids: 2 showed a wide spectrum of excellent antibacterial activities, but 1 did not. The antimicrobial activities of the complexes 1–4, evaluated by minimum inhibitory concentration, were compared and key factors affecting them discussed. The crystal structures of the complexes 3 and 4 were determined by single-crystal X-ray diffraction. The complexes 3 and 4 in the solid state were helical polymers consisting of AgN2P2 cores formed by bridging triazolate anions and two PPh3 ligands. The complexes 3 and 4 were also fully characterized by elemental analyses, TG/DTA and FT-IR in the solid state and by various solution NMR (31P, 109Ag, 1H and 13C) spectroscopies and molecular weight measurements in solution.
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Journal of the Chemical Society, Dalton Transactions
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