Abu Khalid, A. Singh
1997
Citations
0
Influential Citations
29
Citations
Journal
Polyhedron
Abstract
Abstract A (N,Te,N) ligand 2-(2-pyridoethyletelluro)ethylpyridine ( 1 ) has been synthesized by reacting in situ generated Na 2 Te with 2-(2-chloroethyl)pyridine. The Pd II and Pt II complexes of stoichiometry [MCl· 1 ]Cl have been studied. The deshielding of ortho protons of pyridine and CH 2 Te signal (up to 0.5 ppm) indicate that 1 ligates in a tridentate mode. The red shift (20–25 cm −1 ) in ν(TeC(alkyl)) supports the involvement of Te in coordination. Molecular weights and Λ M values of these complexes support their ionic nature (1 : 1 electrolyte). The reactions of 2-(chloromethyl)pyridine and 2,6-bis(chloromethyl)pyridine with ArTeNa (Ar = 4-MeOC 6 H 4 ) could not produce (N,Te) and Te,N,Te) ligands comprising pyridyl groups. The CHCl 3 present as a solvent in these reactions reacted with ArTeNa resulting in (ArTe) 2 CH 2 . To understand the behaviour of Te donor site vis-a-vis pyridyl group the single crystal structure of Pd{4-MeC 6 H 4 TeCH 2 CH 2 -2-(C 5 H 4 N)}Cl 2 · 2CHCl 3 was solved. An endo , puckered chelate ring is formed by (N,Te) ligand. The trans influence of the pyridyl group appears to be lower or comparable to that of tellurium.