Molybdovanadate [VMo7O26]5− cluster directed inorganic-organic hybrid: The highest coordination linkage and in situ isoniazid dimerization

Abstract

A new inorganic-organic hybrid based on both the new molybdovanadate species and the isoniazid dimer, H4K2Na2(H2O)4(C12H12N4O2)(VMo7O26)2·10H2O (1), was synthesized and structurally characterized by single crystal X-ray crystallography, spectroscopic and thermogravimetric analyses. To our knowledge, compound 1 is the first example of inorganic-organic hybrid based on both polyoxometalate and isoniazid. In compound 1, twelve surface oxygen atoms of [VMo7O26]5− cluster are utilized to make coordination linkage with other components; creating the highest coordination connection in molybdovanadates subfamily. Interestingly, the in situ isoniazid dimerization reaction could occur during the synthesis process, and then the in situ generated isoniazid dimer could function as a linker to join the coordination assembly of 3D architecture. Furthermore, the semiconducting property of compound 1 was investigated by photophysical measurements, demonstrating the characteristics of n-type semiconductor.