Secondary bonding in functionalized organotellurium compounds: preparation and structural characterization of bis(acetamido)tellurium(IV) diiodide and bis(4-methylbenzoylmethyl)tellurium(II)

α-Telluration of 2,4,6-trimethylacetophenone under mild conditions: Role of steric factor in the solid state structures of Te(II and IV) compounds

“…Solid state structural characterization of telluroethers is reported either for diaryls with C sp2 eTeeC sp2 or alkylaryls with C sp2 eTeeC sp3 groupings. Single-crystal structural studies on dialkyltellurium(II) with C sp3 eTeeC sp3 groupings, being liquids or low melting solids, are rare and limited to the cyclic tellurium(II) derivatives [5] and (4-MeC 6 H 4 COCH 2 ) 2 Te [6]. In recent years, 2,4,6-trimethylacetophenone, due to steric bulk and mesityl group-induced crystallizability, has attracted considerable attention [7] as a methyl ketone precursor to metal enolates, which themselves are useful in many organic transformations.…”

Structural trends in TeI2RR′: Crystal structures and NMR spectra of TeI2(CH2SiMe3)2, TeI2Th(CH2SiMe3), TeI2Ph(CH2SiMe3), and TeI2Th2 (Th = 2‐Thienyl, C4H3S)

“…It can be seen that Te···I close contacts are more common than I···I close contacts. This seems to be a general feature in all TeI 2 RR′ 3–14. McCullough et al 27 have correlated the presence of I···I secondary bonds with the color of the crystalline material.…”

“…It has previously been reported that the ITeI moiety is often asymmetric, the shorter bonds ranging 2.85–2.90 Å and the longer bonds 2.91–3.01 Å 25,26. The variation in the TeI bond lengths are normally correlated with the I···Te and I···I secondary bonding, but hydrogen bonds and other possible secondary bonding interactions also have a strong influence on the bond lengths and the formation of supramolecular assemblies 3–14.…”

“…Diorganyltellanes react with iodine to afford diiododiorganyltellurium(IV), TeI 2 RR′ 1,2. In these molecules, the primary bonding environment of tellurium is a distorted trigonal bipyramid in which the organic groups and the lone‐pair of tellurium occupy the equatorial positions whereas the iodine atoms lie at the axial positions (for selected molecular species (see 3–14). In the solid state, TeI 2 R 2 molecules generally show intermolecular Te···I or I···I secondary bonding interactions (the concept of which was originally introduced by Alcock 15) that generally expand the AX 4 E (X = bonding pair, E = lone pair) trigonal pyramidal geometry around tellurium into five‐ or six‐coordinate AX 4 YE or AX 4 Y 2 E (X = primary bond, Y = secondary bond) environments and lead to the formation of supramolecular frameworks 3.…”

α-Telluration of 2-acetylthiophene: Electronic influence of the heteroaromatic moiety on solid state structures

“…The interplanar angles between the equatorial CeTeeC plane and the mean planes comprising of skeletal atoms of the organic ligands are 82.42(5) and 72.46 (6) and the internuclear distances between the Te(II) and carbonyl O atoms [d(Te, O) ¼ 3.588(2)Å and 3.609(2) Å] are comparable to S r vdw (Te, O). Thus, the molecular structure of 1 is devoid of intramolecular Te/O attractive interactions that are reported to be present in analogous compounds, (4-MeC 6 H 4 COCH 2 ) 2 Te and (2,4,6-Me 3 C 6 H 2 COCH 2 ) 2 Te [19,22]. Instead, reciprocatory intermolecular Te/O secondary bonding interactions that give rise to centrosymmetric zero-dimensional supramolecular units in its crystal packing ( Figure S2) may be substantiated from the d(Te, O1B) of 3.485(2) Å and : O1BdTedC trans of 151.87 (7).…”