Silver cages with encapsulated acetylenediide as building blocks for hydrothermal synthesis of supramolecular complexes with n-cyanopyridine and pyridine-n-carboxamide(n=3,4)

摘要

New silver(I)double salts(Ag_2C_2)(AgCF_3CO_2)_8(3-pyCONH_2)_2(H_2O)_4(1),[(Ag_2C_2)(AgCF_3CO_2)_4(4-pyCONH_2)(H_2O)]-H_2O(2),(Ag_2C_2)(AgCF_3CO_2)_6(3-pyCONH_2)_4(3),(Ag_2C_2)(AgCF_3CO_2)_6(3-pyCN)_2(4)and(Ag_2C_2)(AgCF_3CO_2)_4(4-pyCN)_2(5)("-pyCONH_2 is pyridine-n-carboxamide,n-pyCN is n-cyanopyridine;n=3,4)have been synthesized by the hydrothermal method.All five compounds contain polyhedral silver(I)cages each encapsulating a C_2~(2-)dianion.Compounds 1,3,4 and 5 exhibit three-dimensional structures,whereas compound 2 is a two-dimensional network.The structure of 1 is constructed from the linkage of a branched-tree architecture via hydrogen bonds.Unlike 4 and 5,which involve the connection of n-cyanopyridine(n=3,4)with silver columns,3 results from the linkage of discrete silver cages via pyridine-3-carboxamide.