Two silver(I)–thiolate polymers with zigzag chain and lamellar structures
摘要:
Two novel Ag(I) coordination polymers containing organosulfur ligands, [Ag-2(bmpb)(NO3)(2)](n) (1) and [{Ag-5(bpsq)(2)(NO3)(4)}-NO3-H2O](n) (2), were synthesized by self-assembly of AgNO3 with the designed non-chelating heterocyclic ligand bmpb (bmpb = 1,4-bis(4,6-dimethyl-2-pyrimidinyl)methylsulfanyl)-benzene) and the chelating heterocyclic ligand bpsq (bpsq = 2,3-bis[(2-pyrimidinyl)methylsulfanyl]-quinoxaline) and characterized by X-ray single-crystal diffraction analyses. For 1, bmpb serves as a bidentate ligand and bridges two Ag(I) centers with two nitrogen atoms from different bimethylpyrimidine rings to form a chain structure. In complex 2, bpsq functions in a hexadentate fashion, in which two sulfur atoms, two nitrogen atoms from quinoxaline ring and two nitrogen atoms from different pyrimidine rings bind to four different Ag(I) centers. Sulfur atoms and adjacent nitrogen atoms from quinoxaline ring chelate with Ag(I) to form stable five-membered rings. The nitrate anions, as a template for the formation of 2-D lamellar structure, act as terminal ligands, bridging ligands and counter ions. (C) 2001 Published by Elsevier Science Ltd.