Dimethylthallium(III) complexes with picolinic acid and its hydroxyl derivatives
摘要:
The reaction of dimethylthallium(III) hydroxide with picolinic acid (Hpic), 3-hydroxypicolinic acid (H(2)3hpic) and 6-hydroxypicolinic acid (H(2)6hpic) in an aqueous/methanol mixture afforded the complexes [TlMe2(pic)] (1), [TlMe2(H3hpic)] (2) and [TlMe2(H6hpic)] (3), respectively. Complex 3', [NaTlMe2(6hpic)(2)](n), was obtained as a minor product from a methanolic solution of 3. Compounds 1-3 were characterized by IR and Raman spectroscopy and, in the cases of 1, 2 and Y, by single-crystal X-ray diffraction. Complex 3' is the first example of an H6hpic(-) heterobimetallic compound to be isolated. The H-1 and C-13 NMR spectra of 1 and 2 are also discussed. (c) 2008 Elsevier Ltd. All rights reserved.