A new 1D polyoxovanadate[Cu(en)_2V _(10)O _(28)][Cu(en)_2(H _2O)]_2·2H _3BO _3·2H _2O containing the rarely non-condensed boric acid

摘要

A new 1D polyoxovanadate containing boric acid[Cu(en)_2V _(10)O _(28)][Cu(en)_2(H _2O)]_2·2H _3BO _3 ·_2H _2O(1, en = ethylenediamine)has been hydrothermally synthesized and structurally characterized. Compound 1 consists of a polyoxovanadate chain[Cu(en)_2V _(10)O ~(4-)_(28)]_n based on the linkage of decavanadate clusters and[Cu(en)_2]~(2+)groups, complex cations[Cu(en)_2(H _2O)]~(2+), free H _3BO _3 and H _2O molecules. The polyoxovanadates and boric acid can undergo polycondensation into various B-O-V clusters under hydrothermal conditions, but 1 is the only example of the non-condensation of polyoxovanadate and boric acid. The IR spectrum and the thermal behavior of 1 were also studied.