Organotellurium(IV) Derivatives of Tetraphenyldichalcogenoimidodiphosphinates − The Crystal and Molecular Structure of [C4H8TeI{Ph2(Se)PNP(Se)Ph2}], [C4H8TeI{Ph2(S)PNP(S)Ph2}], [C4H8Te{Ph2(S)PNP(S)Ph2}2], [C8H8TeI{Ph2(S)PNP(S)Ph2}], and [O(TeC4H8)2{Ph2(O)PNP(O)Ph2}]2[I, I3] Representing a Novel Type of Ring Systems

Abstract

The synthesis of the following organotellurium(IV) compounds [C4H8TeI{Ph2(Se)PNP(Se)Ph2}] (2), [C4H8TeI{Ph2(S)PNP(S)Ph2}] (3), [C8H8TeI{Ph2(S)PNP(S)Ph2}] (4), [C4H8Te{Ph2(S)PNP(S)Ph2}2] (5), and [O(TeC4H8)2{Ph2(O)PNP(O)Ph2}]2[I, I3] (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 monochelate derivatives 2−4 and distorted octahedral for the bis(chelate) compound 5. In compound 6, two oxygen ligands act as bridges between two C4H8Te−O−TeC4H8 units, forming a 16‐membered cationic ring. The anions, I− and I3−, are located above and below the twisted ring with Te···I interactions ranging from 3.532(2) to 3.902(3) Å.

The Nature of the Chemical Bond in Linear Three-Body Systems: From I3–to Mixed Chalcogen/Halogen and Trichalcogen Moieties

“…(n) References [214, 364, 439, 440]. (o) References [200, 213, 214, 235, 317, 372, 373, 378, 440–443]. (p) References [38, 444].…”