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

Abstract Based on ligands of N,N-bis((diphenylphosphino)methyl)benzenamine (pba), 4-(4-(bis((diphenylphosphino)methyl)amino)benzyl)-N-((diphenylphosphino)methyl)benzenamine (dptp) and N,N,N′,N′-tetrakis((diphenylphosphino)methyl)benzene-1,4-diamine (pbaa), three new silver(I) complexes [Ag(pba) 2 ]ClO 4 ( 1 ), [Ag 2 (dptp) 2 ](ClO 4 ) 2 ·2DMF ( 2 ) and [Ag 4 (pbaa)(NO 3 ) 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⋯π interactions to form 1D infinite chains and 2D networks, and the ordered-layer-lattic ClO 4 − and DMF in 2 are between 2D networks. For 3 , the pbaa ligand adopts a tetradentate coordination mode to link two adjacent stair-like [Ag 4 O 4 ] cores resulting in a 1D chain, respectively, with Ag⋯C, N-O⋯π and C-H⋯π 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.