摘要:
The reaction of [Ti(cp*)(2)(BTMSA)] (1) (cp* = eta(5)-C5Me5, BTMSA = bis(trimethylsilyl)acetylene) with malonic acids ((HOOC)(2)CR2, R H, Me) and N,N-dimethylglycine resulted in the formation of titanium(IV) dicarboxylato complexes [Ti(cp*)(2){(OOC)(2)CR2}] (R H, 2; R = Me, 3) and an alpha-amino acid titanium(III) complex [Ti(cp*)(2)(OOCCH2NMe2)] (4). The identities of complexes 2-4 were confirmed by microanalysis, H-1 and C-13 NMR spectroscopy (2, 3), ESI-MS and CID experiments (2, 3) as well as by ESR and magnetic measurements (mu(eff) = 1.81, 298 K) for 4. Single X-ray diffraction analyses of 2 and 4 exhibited monomolecular complexes in which the titanium atom is distorted tetrahedrally coordinated by two eta(5)-C5Me5 rings and by the chelating bound malonato-kappa O-2,O' (2) and N,N=dimethylglycinato-kappa(2) O,O' ligand (4). (c) 2006 Elsevier B.V. All rights reserved.