Syntheses and Structures of Two Organic–Inorganic Composite Vanadoborates Na2(Hen)4[B18V12O60]·16H2O and (H2en)6[B18V12O60]2·2tepa·11H2O

Abstract

Two organic–inorganic composite vanadoborates Na2(Hen)4[B18V12O60]·16H2O (1) (en = ethylenediamine) and (H2en)6[B18V12O60]2·2tepa·11H2O (2) (tepa = tetraethylenepentamine) have been hydrothermally synthesized and characterized by elemental analyses, inductively coupled plasma atomic emission spectrometry (ICP-AES) analyses, IR spectra, and X-ray crystallography. Single-crystal structural analyses show that 1 exhibits a 2-D polyoxovanadium borate sheet architecture with a four-connected topology established by [B18V12O60]6− units via Na+ bridges whereas the molecular unit of 2 consists of two discrete [B18V12O60]6− clusters, six diprotonated [H2en]2+ cations, two tepa molecules, and 11 lattice water molecules.