CIS-/TRANS-ISOMERISM OF BIS-(TRISALKOXY)-HEXAVANADATES - CIS-NA-2[V-6(IV)O-7(OH)(6)((OCH2)(3)CCH2OH)(2)]CENTER-DOT-8H(2)O, CIS-(CN3H6)3[V-5(IV)O-V(13)((OCH2)(3)CCH2OH)(2)]CENTER-DOT-4,5H(2)O AND TRANS-(CN3H6)(2...