Syntheses, structures and properties of a series of nickel(II) complexes derived from amino-5-mercapto-1,3,4-thiadiazole

Abstract

Four complexes possessing photocatalytic activity, namely [Ni(AMT)2(EDA)2]2 (1), [Ni4(AMT)6(μ3-OH)2(H2O)6] (2), [Ni4(AMT)6(μ3-OH)2(H2O)6]·4H2O (3) and [Ni4(AMT)6(μ3-OH)2(H2O)6]·2H2O (4) (AMT = amino-5-mercapto-1,3,4-thiadiazole and EDA = diethanolamine) have been obtained from solvothermal reactions and characterized by physico-chemical and spectroscopic methods. Although complexes 1–4 were prepared from common reactants (nickel nitrate and AMT), the use of different organic amines and reaction conditions lead to the observed differences in their structures. Complex 1 is mononuclear, while complex 2 is a {Ni4} cluster. Complexes 3–4 are expanded into supramolecular structures by hydrogen bonding interactions, but differences in their lattice water molecules lead to the different supramolecular structures. Photocatalytic studies reveal that complex 4 exhibits good catalytic activity for the degradation of the organic dye methylene blue. Four complexes possessing photocatalytic activity and constructed from the late transition metal Ni(II) and the 2-amino-5-mercapto-1,3,4-thiadiazole ligand have been obtained in solvothermal conditions. Although complexes 1–4 were prepared from common reactants (nickel nitrate and AMT), the use of different organic amines and reaction conditions lead to the observed differences in their structures. Complex 1 is mononuclear, while complex 2 is a {Ni4} cluster. Complexes 3–4 are expanded into supramolecular structures by hydrogen bonding interactions, but differences in their lattice water molecules lead to the different supramolecular structures. Photocatalytic studies reveal that complex 4 exhibits good catalytic activity for the degradation of the organic dye methylene blue.