Complex formation of vanadium(IV) with 1,3,5-triamino-1,3,5-trideoxy-cis-inositol and related ligands

The complex formation of vanadium(IV) with 1,3,5-triamino-1,3,5-trideoxy-cis-inositol (taci) and 1,3,5-trideoxy-1,3,5-tris(dimethylamino)-cis-inositol (tdci) was studied in aqueous solution and in the solid state. The formation constants of V(IV)O(taci)](2+), V(IV)O(tdci)](2+), and V(IV)(tdci)(2)](4+) and of the deprotonation product V(IV)(tdci)(2)H(-)(1)](3+) were determined (25 degrees C, 0.1 M KNO(3)). Cyclic voltammetry measurements established a reversible one-electron transfer for the V(IV)(tdci)(2)H(-)(m)]((4)(-)(m))/V(III)(tdci)(2)H(-)(n)]((3)(-)(n)) couple (0