Two Polymorphs of Bis(4-methoxyphenyl)tellurium(IV) Diiodide

Abstract

The title compound, (C7H70)2TeI2 (or Ci4Hi41202Te), crystallizes in space group Pi, either with Z = 8, (Ia), or Z = 4, (Ib). The six independent molecules [four in (Ia) and two in (Ib)] have very similar structures. The geometry at the Te atoms is pseudo-trigonal bipyramidal, with the I atoms in the axial positions and the anisyl groups and the lone pair of electrons in the equatorial plane. The Te--C and Te--

The structural diversity of Te–I interactions within tetraorganoditelluroxane diiodides and related compounds

“…The crystal structure of 1a consists of a centrosymmetric tetramer made of (p-MeOC 6 H 4 ) 2 TeI 2 molecules, which are associated via secondary TeÁ Á ÁI interactions. The bond parameters and the supramolecular arrangement of the tetramer are virtually identical with those of the two known polymorphs of (p-MeOC 6 H 4 ) 2 TeI 2 (1) [6]. The iodine molecule of 1a links adjacent tetramers in the crystal lattice via IÁ Á ÁI contacts of average 3.360(1) Å .…”

“…Taking into account the stereochemically active lone pair, the spatial arrangement around the Te atoms is trigonal biyramidal with a C 2 IO donor set and the expected ligand occupancies. The average axial Te-I bond lengths of 3.278(2) Å are considerably longer than those of (p-MeOC 6 H 4 ) 2 TeI 2 (1) being 2.9234(8) Å [6]. In turn, The Te-O bond lengths of 1.986(6) Å are somewhat shorter than the Te-O 'single bonds' of the polymeric parent [(p-MeOC 6 H 4 ) 2 TeO] n (2) being 2.063(2) Å [4].…”

“…The redistribution reaction of equimolar amounts of (p-MeOC 6 H 4 ) 2 TeI 2 (1) and (p-MeOC 6 H 4 ) 2 TeO (2) produced the tetraorganoditelluroxane diiodide [(p-MeO-C 6 …”

Twinning by merohedry in bis(4-methoxyphenyl)tellurium(IV) diiodide dimethyl sulfoxide hemisolvate

“…Compound (I) was prepared as described previously by Farran et al (1998). Green crystals of the title hemisolvate, (II), were obtained by slow evaporation from a DMSO solution of (I) at room temperature or at 277 K. After removal from solution and drying, the crystals decomposed slowly (in a few days) in air to give a red unsolvated crystalline powder.…”

“…In a previous paper (Farran et al, 1998), we reported the crystal structures of two polymorphs of (I), namely (Ia) in space group P1 with Z = 8 and (Ib) in space group P1 with Z = 4, and mentioned several other crystal phases containing (I) and iodine, benzene, acetonitrile and dimethyl sulfoxide (DMSO). Among these crystals, those including DMSO were remarkable in their colour as, unlike the shades of red displayed by the other crystals, they were green with a metallic lustre (Fig.…”