A novel 2D vanadium(V)-isonicotinohydrazide coordination polymer, C _(15)H_(16)AgN_4O_8V: Synthesis, structure, catalytic activity and DFT calculation

摘要

A novel two-dimensional 3d-4d transition metal-based coordination polymer [VO(OCH_3)(OHCH_3)(L)Ag(NO_3)]_∞ (1) has been synthesized and characterized by single crystal X-ray diffraction and fluorescence spectroscopy (H_2L = (E)-N′-(2- hydroxybenzylidene)isonicotinohydrazide). The coordination sphere of each V center is octahedral and chelates to a tridentate ligand L, while the tetrahedral conformation of Ag center consists of two O and two N atoms. Infinite zigzag chains of Ag-tetrahedrals are formed. The hydrazinide L ~2- ligands of octahedral-V centers link adjacent chains to form an undulated heterometal based 2D layer. DFT calculations on 1 reproduced the geometric parameters and the electronic absorptions were predicted. The coordination polymer 1 showed very selective heterogeneous catalytic activity with 77-89% conversion in oxidation of alkenes, cyclooctane and benzyl alcohol by H_2O_2.