Organotellurium(IV) Derivatives of Tetraphenyldichalcogenoimidodiphosphinates - The Crystal and Molecular Structure of [C_4H_8TeI{Ph_2(Se)PNP(Se)Ph_2}], [C_4H_8TeI{Ph_2(S)PNP(S)Ph_2}], [C_4H_8Te{Ph_2(S)PNP(S)Ph_2}_2], [C_8H_8TeI{Ph_2(S)PNP(S)Ph_2}],

摘要

The synthesis of the following organotellurium(IV) compounds [C_4H_8TeI{Ph_2(Se)PNP(Se)Ph_2}] (2), [C_4H_8TeI{Ph_2(S)-PNP(S)Ph_2}] (3), [C_8H_8TeI{Ph_2(S)PNP(S)Ph_2}] (4), [C_2H_8Te{Ph_2(S)PNP(S)Ph_2}_2] (5), and [O(TeC_4H_8)_2{Ph_2(O)-PNP(O)Ph_2}]_2[I, I_3] (6) was achieved. These compounds have been characterized by microanalysis, multielement NMR and IR spectroscopy, positive ion FAB mass spectrometry and single-crystal X-ray diffraction analysis. The solid-state structures show that the coordination geometry at the tellurium center in every derivative can be described as a distorted pseudo-trigonal bipyramid, in which the lone-pair of electrons is supposed to occupy an equatorial position. The selenium and sulfur ligands exhibit an aniso-bidentate chelating coordination mode on interaction with the tellurium center. When the aniso-bonded donor atoms are included in the coordination sphere, the environment about Te becomes distorted square-pyramidal for the monchelate derivatives 2-4 and distorted octahedral for the bis(chelate) compound 5. In compound 6, two oxygen ligands act as bridges between two C_4H_8Te-O-TeC_4H_8 units, forming a 16-membered cationic ring. The anions I~- and I_3~-, are located above and below the twisted ring with Te…I interactions ranging from 3.532(2) to 3.902(3) A.