N-{2-(4-methoxyphenyltelluro)ethyl}morpholine (L-1) and its platinum(II) and ruthenium(II) complexes. Synthesis and crystal structure of L-1 and trans-[PtCl2(L-1)(2)]

摘要

The first tellurated derivative of morpholine, N-{2-(4-methoxyphenyltelluro)ethyl}morpholine (L-1) has been synthesized by reacting in situ generated ArTe- with 4-(2-chloroethyl)morpholine hydrochloride under N-2 atmosphere. The compound L-1 gives molecular ion peak at m/z 351 and is characterized structurally. The donor atoms N and Te in compound L-1 are rightly oriented for its ligation in bidentate mode. The Te-C(alkyl) is 0.02 Angstrom longer than Te-C(aryl). The complexes of ligand L-1 having composition [PtCl2(L-1)(2)] (1) and [RuCl2(p-cymene)L-1] (2) have been synthesized. The compound 1 has been characterized structurally. The Pt has a square planar geometry in complex 1 and two molecules of ligand L-1 bonded through Te alone are trans to each other (Pt-Te = 2.583(2) Angstrom). The C-13{H-1} NMR spectrum of complex 1 is as expected. The H-1 NMR spectrum of single crystals of complex 1 shows multiplication of signals, which is supported by HETCOR experiments. The complex 2 also has ligand L-1 in a monodentate coordination mode, bonded through Te alone. This is supported by deshielded CH2Te and ArC-Te signals in H-1 and C-13{H-1} NMR spectra of complex 2 with respect to those of free ligand L-1. The HETCOR spectrum of complex 2 has been used to authenticate the assignments of CH2Te group, as its two protons appear to be magnetically non-equivalent. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 24]