Homo- and hetero-bimetallic glycolates and triethanolaminates of niobium |
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| Authors: | Sharma Maneesh K. Singh Anirudh Mehrotra Ram C. |
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| Affiliation: | (1) Department of Chemistry, University of Rajasthan, Jaipur, 302004, India |
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| Abstract: | [Nb(OiPr)5] reacts with 2,5-dimethylhexane-2,5-diol (LH2), 2,3-dimethylbutane-2,3-diol (L1H2) and triethanolamine (teaH3) in different stoichiometric ratios to yield complexes of the types: [Nb(OiPr)3(L)] (1), [Nb(OiPr)(L)2] (2), [Nb(L)2(LH)] (3), [Nb(L1)2(L1H)] (4) and [Nb(tea)(teaH)] (5). Equimolar reactions of (3), (4) and (5) with Al(OiPr)3, Ti(OiPr)4 and [Ta(OiPr)5] yield novel heterobimetallic isopropoxide-glycolate (6)–(9) and -triethanolaminate (10)–(12) derivatives. Reactions in appropriate molar ratios of (1), (2) and (10) with alkoxyethanols [ROC2H4OH; R = Me, Et] and acetylacetone [acacH] give derivatives [(MeOC2H4O)3Nb(L)] (13), [(acac)Nb(L)2] (14), [Nb(tea)2{Al(OC2H4OMe)2}] (15), [Nb(tea)2{Al(OC2H4OEt)2}] (16) and [Nb(tea)2{Al(acac)2}] (17). The complexes (6), (8) and (10) on reaction with an excess of t-BuOH give the tert-butoxo analogues (18), (19) and (20), respectively. These new derivatives have been characterized by elemental analyses, spectroscopic studies and molecular weight measurements. |
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