Synthesis, structures and properties of Ag+ complexes containing polyphosphine ligands with extended Ag•••C, N-O•••π and C-H•••π interactions

Based on ligands of N,N-bis((diphenylphosphino)methyl)benzenamine (pba), 4-(4-(bis((diphenylphosphino)methyl)amino)benzy1)-N-((diphenylphosphino)methyl)benzenamine (dptp) and N,N,N,Ni-tetrakis((diphenylphosphino)methyl)benzene-1,4-diamine (pbaa), three new silver(I) complexes [Ag(pba)2] C104 (1), EAg2(dPtP)21(C104)2.2DMF (2) and [Ag4(pbaa)(NO3)(4)](n) (3), have been synthesized and characterized. Structural analysis reveals that all of these complexes contain the 1D infinite chains, with different variations in the weak interactions. Complexes 1 and 2 are interconnected by intermolecular C-H center dot center dot center dot pi interactions to form 1D infinite chains and 2D networks, and the ordered-layer-lattic C1071 and DMF in 2 are between 2D networks. For 3, the pbaa ligand adopts a tetradentate coordination mode to link two adjacent stair-like [Ag4O4] cores resulting in a 1D chain, respectively, with Ag center dot center dot center dot C, N-O center dot center dot center dot pi and C-H center dot center dot center dot pi interactions. All these show that phosphine ligands play an important role in the construction of interesting topological structures with different types of the weak interactions. (C) 2016 Elsevier B.V. All rights reserved.