Mononuclear and coordination polymer of silver(I) complexes: design, synthesis, and crystal structure analysis

Abstract

A series of mononuclear structures and coordination polymers of silver(I) has been synthesized and characterized by IR spectroscopy, NMR spectroscopy, and single-crystal X-ray diffraction. Reaction of the silver(I) precursor [Ag(PPh3)2(OAc)] with 2,3-pyridinedicarboxylic acid (2,3-pyCOOH), 2,6-pyridinedicarboxylic acid (2,6-pyCOOH), 3-pyridinecarboxylic acid (3-pyCOOH), and 4-pyridinecarboxylic acid (4-pyCOOH) afforded mononuclear complexes [Ag(PPh3)2(2,3-COO)] (1), [Ag(PPh3)2(2,6-COO)]·EtOH·MeCN (2), [Ag(PPh3)2(3-COO)]·H2O (3), and [Ag(PPh3)2(4-COO)] (4), respectively. Coordination polymers [Ag(PPh3)(2,3-COO)]n (5), [Ag2(PPh3)2(3-pyCOO)2]n (6), and [Ag(PPh3)2(4-COO)]n·EtOH (7) were obtained from reaction of Ag(OAc), PPh3, and pyridinedicarboxylic acid or pyridinecarboxylic acid. Even though the formation of 5 can be achieved by hydrothermal reaction using similar reactants to those in formation of 1, the percentage yield and by-products of the final product prohibit further analysis of the compound. Complexes 5 and 6 are 1-D zigzag and ladder type structures, respectively, with argentophilic interactions, Ag⋯Ag, dominating the stability of 6. Complex 7 shows a 2-D layer structure with three-connected 4.82-fes topology.