Two substituted tetrazole-based isomers of [M2(PPT)(OH)(SO4)(H2O)]n (M = Zn, Cd): The in-situ syntheses and characterization

Two new isotypic substituted tetrazolates of d10 metals, [M2(PPT)(OH)(SO4)(H2O)]n, (M = Zn, 1 and Cd, 2) (PPT = 5-(4-pyridylphenyl)tetrazole) have been in-situ synthesized using the metal sulfates, 4-(4-pyridyl)benzonitrile (PBN) and sodium azide under mild solvothermal conditions. The prepared materials have been characterized by single crystal X-ray diffraction, powder XRD, elemental analyses, IR & Raman spectroscopy, SEM-EDS, solid state fluorescence, and TG analyses. The PPT ligand in both compounds is generated via the in situ [2 + 3] cycloaddition in the reaction of the cyano groups of the organonitrile and sodium azide. Single crystal X-ray diffraction reveals both materials possess 3D framework of six-coordinated metal polyhedrons that are further connected by the PPT linkers. The BV calculation confirms the existence of extremely long ZnO bond distance of 2.663 Å in compound 1. In addition, the solid-state photoluminescence indicates the cadmium-based material has a more intensive photoluminescent emission than the zinc one upon excitation at room temperature.