Synthesis and Structural Characterization of a New Polyoxovanadium Borate: (H_3NCH_2CH_2NH_3)_4[(VO)_6(B_(10)O_(22))_2]·(H_3O)_7

摘要

The title compound (H_3NCH_2CH_2NH_3)_4[(VO)_6(B_(10)O_(22))_2](H_3)_7 1 has been synthesized by the hydrothermal method and determined by X-ray crystallography. Crystallographic data: monoclinic, space group C2/c, a = 20.250(4), b = 13.448(3), c = 21.655(4) A, β = 97.05(3)°, M_r = 851.74 (C_4H_(30.5)B_(10)N_4O_(28.5)V_3), V= 5852(2) A~3, Z= 8, D_c = 1.933 g/cm~3, μ = 1.057 mm~(-1), F(000) = 3436, R = 0.0500 and wR = 0.1442 for 4511 observed reflections with I > 2σ(I). The structure consists of [(VO)_6(B_(10)O_(22))_2]~(15-) cluster anions that have a central band of six trans-edge-sharing VO_5 square pyramids capped by two [B_(10)O_(22)]~(14-) polyborate ligands. Other characterizations are also described by elemental analysis, IR spectrum and thermal analysis.