Crystal and molecular structure of chlorotris[bis(2-hydroxyethyl)dithiocarbamato]tellurium(IV) dihydrate

Main Group Dithiocarbamate Complexes

“…Formal substitution of one of the dithiocarbamates in [Te(S 2 CNR 2 ) 4 ] by a uninegative ligand gives seven coordinate Te(IV) complexes of general formulas [TeR(S 2 CNR 2 ) 3 ] and [TeX(S 2 CNR 2 ) 3 ] (R ¼ aryl; X ¼ halide or pseudohalide) (293,304,309,312,319,323,(333)(334)(335)(336)(337)(338)(339)(340)(341)(342). In all cases the geometry at Te is distorted pentagonal bipyramidal, with the uninegative ligand (R or X) axial and one dithiocarbamate ligand spanning axial and equatorial positions.…”

Tris(diethyldithiocarbamato)(4-methoxyphenyl)tellurium(IV), p-MeOC6H4Te(S2CNEt2)3, and the Triclinic Modification of Tris(diethyldithiocarbamato)phenyltellurium(IV), PhTe(S2CNEt2)3

“…Since the trans influence of the halogen ligand is much smaller than that of the dithiocarbamate ligand, the Te--Sax bond is stronger than all the Te--Seq bonds. This situation is realized in complexes of the general formula Te(R1RzNCS2)3C1 with R 1 = R 2 = Et [as the 1:1 dioxane solvate, (6)] (von Deuten, Schnabel & Klar, 1980), R 1 = R 2 = CH2CH2OH [as the dihydrate, (7)] (Rao, Seshasayee, Aravamudan & Radha, 1983) and R 1 = Me, R 2 = CHECH2OH [as the dihydrate, (8)] (Husebye & Thowsen, 1981), where there is strengthened axial coordination (Te~S 2.465-2.512,~, trans C1--Te~S angle 174.9-179.1 °) and significantly weakened equatorial coordination (Te~S 2.801-2.874 A, cis angle 108.3-114.1°). The structure of the Br analogue of (8), compound (9), is practically the same (Husebye, 1979).…”

Reactions of 1,1-Diiodo-3,4-benzocyclopentatellurane with Sulfur and Selenium Ligands: X-Ray Structure of a Dicationic Telluraheterocycle, [C8H8Te{S=C(NMe2)2}2][BF4]2

“…Of particular interest has been evidence of the stereochemically active lone pair on tellurium (IV). 2 In contrast, some of the higher coordination numbers (six or above) also have a tellurium atom that displays no evidence for a stereochemical lone pair: Archetypal examples include TeX 6 2− [X = Cl, Br], 3,4 TeX 4 (tmtu) 2 [tmtu = tetramethylthiourea], 5 and TeL 4 compounds such as Te(dithiocarbamate) 4 . All of these examples show no intramolecular secondary bonding.…”