Synthesis, spectral and structural studies of silver and gold(I) complexes containing some symmetrical diphosphine ligands

New silver(I) and gold(I) complexes [Ag3(m2-CN) 3(k(2)-P, P-dppf) 2](n) C6H12 (1), [Ag-4(mu(2)-CN)(4)(k(1)-P, P-dtbpf)](n) (2), [Au-2(mu(1)-CN)2(k(1)-P, P-dppf)] (3), [Au-2(mu(1)-CN)(2)(k(1)-P, P-dtbpf)] (4), [Ag-4(mu(3)-CN)(2)(mu(1)-CN)(2)(k(1)-P, P-dcpf)(2)] (5), and [Au-2(mu 1-CN) 2(k(1)-P, P-dcpf)] (6) were prepared starting with MCN (M Ag, Au) and dppf/ dtbpf/ dcpf (dppf 1,10-bis(diphenylphosphino) ferrocene; dtbpf 1,10-bis(di-tert-butylphosphino) ferrocene; dcpf 1,10-bis(dicyclohexylphosphino) ferrocene) in 1: 1 M ratio in DCM: MeOH (50: 50 V/ V) at room temperature. The resulting complexes have been characterized by elemental analysis, IR, 1H & 31P NMR, ESI-MS and electronic absorption spectroscopy. Molecular structures for the complexes 1, 2, 5, and 6 were determined crystallographically. Complex 1 and 2 exist as an infinite one-dimensional (1D) polymeric chain constructed by [(mu(2)-CN) Ag(mu(2)-CN) Ag] fragments bridged via dppf/ dtbpf ligands. The molecular structure of 5 reveals a centrosymmetric dimeric complex in which the two silver atoms are bonded to two dcpf ligands in k(1) manner and two cyanide groups in a m3 bonding mode to generate nearly planar Ag-2(mu(3)-CN)(2) framework, while complex 6 exists in open bridging mode containing Au atoms in ideal linear coordination defined by P, CN-donor sets. (C) 2014 Elsevier B.V. All rights reserved.