Two new Zn(II)/Cu(II) complexes based on bi- and tritopic 1,2,4-triazole derivatives with glutaric acid: Syntheses, structures, luminescent and magnetic properties

Abstract

Two new Zn(II)/Cu(II) coordination polymers, [Zn(OPBT)(GA)]n (1) and {[Cu2TTPA(GA)2]·1.5H2O}n (2), have been successfully synthesized from flexible glutaric acid (H2GA) with different bi- and tritopic 1,2,4-triazole derivatives (OPBT=1.1′-(oxybis(1,4-phenylene))bis(1H-1,2,4-triazole), TTPA=tris(4-(1H-1,2,4-triazol-1-yl)phenyl)amine) and Zn(II)/Cu(II) nitrate salts. Their structures have been characterized by infrared spectra, elemental analyses, single crystal and powder X-ray diffraction analyses and thermogravimetric analyses. Both complexes 1 and 2 feature different 2D layers with sql topologies, which can be further arranged ABAB-type, leading to different 3D supramolecular frameworks by C-H···O hydrogen bonding or O-H···O/N hydrogen bonding/π···π stacking interactions. Moreover, the photoluminescence spectra of complex 1 are examined and variable-temperature magnetic susceptibility measurements of complex 2 reveal antiferromagnetic interactions between binuclear Cu(II) ions of paddle-wheel second building units (SBUs).