A NEW LINDQVIST-TYPE HEXAMOLYBDATE CLUSTER FUNCTIONALIZED WITH THE jt-DONOR LIGAND 4-BROMO-2,6-DIMETHYLPHENYLIMIDO: SPECTROSCOPIC, ELECTROCHEMICAL AND STRUCTURAL STUDIES

Abstract

A new ionic organic-inorganic hybrid complex of formula (n-Bu 4 N) 2 [Mo 6 O 18 (NR)]⋅½Me 2 CO, R = -C 6 H 2 -2,6-Me 2 -4-Br, (n-Bu 4 N) 2 [1]⋅½Me 2 CO, has been prepared in acetonitrile by reacting tetrabutylammonium α-octamolybdate, (n-Bu 4 N) 4 [α-Mo 8 O 26 ], with 2,6-dimethyl-4-bromoaniline hydrochloride, 2,6-Me 2 -4-Br-C 6 H 2 NH 2 ⋅HCl, using N,N'-dicyclohexylcarbodiimide, (C 6 H 11 )N=C=N(C 6 H 11 ), as dehydrating agent. This complex, formulated as (n-Bu 4 N) 2 [1]⋅½Me 2 CO, contains a C-Br group which can be functionalized for constructing novel hybrid materials. The complex was fully characterized by IR, UV-Vis, 1 H-and 13 C-NMR spectroscopies, and authenticated by single crystal X-ray diffraction analysis. The asymmetric unit contains two crystallographically independent anions, [1] 2-, differing by the orientation of the phenyl ring relative to the hexamolybdate skeleton, and one molecule of acetone. Both molecules differ in the angles Mo(1)-N(1)-C(1)= 172.2(6) and Mo(7)-N(2)-C(9)= 175.6(6)°. These angles, near to 180°, indicate the presence of a Mo≡N triple bond.