Two highly connected frameworks and one polythreading architecture based on multidentate N-donor ligands: Syntheses, structures, characterizations and photoluminescent properties

Abstract

Three coordination polymers based on multidentate N-donor ligands and polycarboxylate anions, namely, [Co3(4,4′-tmbpt)4(btc)2]·9.5H2O (1), [Ag4(4,4′-tmbpt)(btec)(H2O)2]·H2O (2) and [Zn(4,4′-tmbpt)(btec)0.5(H2O)]·0.5H2O (3) (4,4′-tmbpt=1-((1H-1,2,4-triazol-1-yl)methyl)-3,5-bis(4-pyridyl)-1,2,4-triazole, H3btc=1,3,5-benzenetricarboxylic acid, and H4btec=1,2,4,5-benzenetetracarboxylic acid) have been prepared under hydrothermal condition. Compound 1 displays a 3D (3,6,8)-connected framework with (4·62)(44·610·8)(414·612·82) topology. Compound 2 is a 3D (4,5,8)-connected framework with (43·62·8)(43·65·82)(48·62)(410·610·88) topology. Compound 3 exhibits a 2D→3D polythreading architecture. The photoluminescent spectra indicate that at room temperature, compounds 2 and 3 emit green and blue luminescence, respectively.