Carboxylate-modulated two novel Ag(I) coordination compounds with benzoguanamine ligand: Syntheses, structures, thermal stability and photoluminescent properties

Two mixed-ligand coordination complexes (CCs) of the formula [Ag2(bga)2(pnba)2(H2O)]·(bga)2 (1) and {[Ag3(bga)3(dnb)3(H2O)]·(CH3OH)·(C2H5OH)}n (2) (bga = benzoguanamine, Hpnba = 4-nitrobenzoic acid, Hdnb = 3,5-dinitrobenzoic acid) were synthesized by reactions of AgNO3 and bga in the presence of different carboxylates under the ammoniacal condition. Both CCs have been characterized by element analysis, powder X-ray diffraction (PXRD), IR and X-ray single-crystal diffraction. Complex 1 is 0D discrete molecule which is extended to 1D supramolecular chains through intermolecular N–H···N complementary hydrogen bonds. Complex 2 is a 1D infinite chain containing monodentate and bidentate bga ligands. Analogously, the presence of complementary N–H···N hydrogen bonds drives the 1D chains to form 2D supramolecular sheet. In addition, the thermal stabilities and the photoluminescence properties of them were also investigated.

► Two new silver(I) coordination complexes were synthesized and characterized.
► Complementary N–H···N hydrogen bonds, π···π stacking and C–H···π interactions were observed.
► Different auxiliary carboxylates determine the diverse structures.