Structural diversities, magnetic, luminescence and photocatalytic properties of seven inorganic-organic hybrid supramolecular complexes based on 3,5-dimethyl-2,6-bis(3-(pyrid-2-yl)-1,2,4-triazolyl) pyridine

Abstract

Seven inorganic-organic hybrid complexes, based on 3,5-dimethyl-2,6-bis(3-(pyrid-2-yl)-1,2,4-triazolyl) pyridine (H2DBPP), have been obtained under the solvothermal reactions, namely, [M2(HDBPP)2(ox)] (M=Co for 1, Zn for 2, and Ni for 3), [Zn2(H2DBPP)2(ox)]·[Mo6O19]·4H2O (4), [M2(H2DBPP)2(ox)]·[β-H2Mo8O26]·2H2O (M=Co for 5, and Ni for 6), and [Ni2(H2DBPP)3]·[β-H2Mo8O26]·5H2O (7). Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. Crystal structural analysis revealed that these complexes composed of [M2(H2DBPP)2(ox)] or [Ni2(H2DBPP)3] cations and polyoxometallates interacted by electrostatic interactions and hydrogen bonds. Interestingly, the anions of these complexes took on [Mo6O19]2− cluster, single [β-H2Mo8O26]2− cluster, and twin [β-H2Mo8O26]2− clusters by changing the metal ions, and solvents. Besides, the magnetic property of complexes 1, 3, 5–7, the solid state luminescence properties of complexes 2, 4 and the photocatalytic activities of complexes 4, 7 have been investigated.