Syntheses, structures and photoluminescent properties of two zinc(II) coordination polymers based on aromatic polycarboxylate and 1,4-bis(imidazol-1-ylmethyl)benzene

Abstract

Hydrothermal reaction of Zn(NO 3) 2·6H 2O with benzene-1,2,3-tricarboxylic acid (H 3BTC) or 5-bromoisophthalic acid (H 2BIPA) in the presence of 1,4-bis(imidazol-1-ylmethyl)benzene (bix) produced two novel coordination polymers [Zn 2(OH)(BTC) (bix)]·H 2O ( 1) and Zn(BIPA)(bix) ( 2), which were characterized by single-crystal X-ray diffraction, elemental analysis, IR and thermoanalysis. Complex 1 is a novel example of the 2D (3,4)-connected nets with (4 2·6)(4 2·6 3·8) topology. In 2, the BIPA and bix ligands linked the Zn(II) atoms into a deeply corrugated 2D sheet. The corrugated 2D sheets polycatenate each other in a parallel manner yielding a rare 2D → 3D parallel polycatenation net. Thermal and luminescent properties of two complexes have also been investigated.