Synthesis and Characterisation of Some Novel Seven-membered Heterocyclic Antimony(III) Glycolate Complexes

Reaction of Sb(OPri)(3) with 2)5-dimethylhexane-2,5-diol(HOGOH) in 1 : 2 molar ratio affords homometallic derivative [{Sb(OGO)(OGOH)}(2)] 1, which contains seven-membered antimony glycolate rings, a unique example in the antimony glycolate chemistry. Equimolar reactions of I with different metal isopropoxides and Me3SiCl yield new types of heterocyclic heterobimetallic derivatives such as [{Sb(OGO)(2)}(M(OPri)(n-1)}(2)] (M =Al (n = 3), 2a; Ti (n = 4), 2b; Nb (n = 5), 2c; and [{Sb(OGO)(OGOSiMe(3))}(2)], 3. Reactions of 2a with acetyl-acetone(acacH), 2,5- dimethythexane-2,5-diol, and a bifunctional tridentate Schiff base LH2 (where L = OC10H6CH=NCH2CH2O) afford derivatives [{Sb(OGO)(2)Al (acac)(2)}(2)] 4, [{Sb(OGO)(2)Al (OGO)}(2)] 5, and [(Sb(OGO)(2)Al(L)}(2)] 6, respectively. All of these new derivatives have been characterised by elemental analyses, molecular weight measurements and spectroscopic (IR; NMR, H-1, C-13, Al-27, and Si-29) studies.