Abstract
The first example of a (Te, O, N) type of hybrid organotellurium ligand N-[2-(4-methoxypphenyltelluro)ethyl]phthalimide ( 1) has been made by reaction of N-(2-bromoethyl)phthalimide with the nucleophile 4-MeOC 6H 4Te − generated in situ by borohydride reduction of bis(4-methoxyphenyl)ditelluride under a nitrogen atmosphere. Palladium(II) complexes of 1, namely [PdCl 2. 1], [PdCl. 1]ClO 4 ( 2), [(Ph 3P) 2Pd. 1](ClO 4) 2 ( 3) and [(DPPE)Pd. 1](ClO 4) 2 ( 4), where DPPE Ph 2PCH 2CH 2PPh 2 have been synthesized. In all the complexes except 2 the ligand 1 is coordinated through N and Te, as indicated by deshielding (0.1–0.7 ppm) of the CH 2Te and CH 2N signals in their 1H NMR spectra with respect to those for free 1, and a red shift (10–25 cm −1)in ν(TeC) alkyl-aryl. Complex 2 was found to be a 1:1 electrolyte and the ligand 1 in this complex is coordinated through oxygen as well as the through N and Te, as indicated by a red shift (30 cm −1) in the ν(CO) band of 1 on complexation. Complexes 3 and 4 were found to be 1:2 electrolytes. The presence of CHCl 3 in [PdCl 2. 1], 3 and 4 was revealed by weight losses in thermogravimetric analysis at 65–70°C. The UV-visible spectra of all the complexes suggest a square planar geometry of the ligands around palladium.
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