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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

2001; Wiley; Volume: 2001; Issue: 9 Linguagem: Inglês

10.1002/1099-0682(200109)2001

1099-0682

V. García-Montalvo, M.K. Zamora-Rosete, D. Gorostieta, Raymundo Cea‐Olivares, Rubén A. Toscano, Simón Hernández‐Ortega,

Crystal structures of chemical compounds

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.