Coordination properties of compounds of (C6H5)nTeHal4?n class

Diorganyl Derivatives of Tellurium(IV) (σ-Telluranes of R2TeX2Type)

“…The heat of formation of the 1 : 1 adduct of diphenyltellurium dichloride with di(hexy1)sulfoxide is about 1 kcalmol-' [324]. This value is much lower than that measured for the adducts of this sulfoxide with TeC14 (10.7 kcal mol-') and phenyltellurium trichloride (6.3 kcal mol-').…”

“…This value is much lower than that measured for the adducts of this sulfoxide with TeC14 (10.7 kcal mol-') and phenyltellurium trichloride (6.3 kcal mol-'). These data indicate the following order of decrease in acceptor ability of TeC14 and its organic derivatives: TeC14 > PhTeC13 > PhzTeClz [324].…”

“…By coupling SbClS with dialkyl-and diaryltellurium The donor properties of tellurium in Ph,TeC14-, compounds are evident by the formation of their stable 1 : 1 complexes with AlEr3. Heats of formation of these complexes increase in the order of (n = 0) 39.9 kcal mol-' < (n = 1) 41 kcal mol-' < (n = 2) 43.8 kcal mol-' [324] which is the reverse to the acceptor abilities of these compounds as measured by the heats of formation of their complexes with di(hexy1)sulfoxide.…”

Monoorganyl derivatives of tellurium(IV)

“…The composition and the enthalpy of formation of the complex of PhTeCl 3 with (C 6 H 13 ) 2 SO were determined by calorimetric titration. 198 Judging from the enthalpies of formation, the acceptor abilities of tetracoordinate tellurium derivatives decrease in the series TeCl 4 > PhTeCl 3 > Ph 2 TeCl 2 . 198 It should be noted that Garad 199 assigned the 1 : 1 and 2 : 1 compositions to complexes of aryltellurium trichlorides with bidentate ligands (bipyridyl or phenanthroline) and monodentante ligands [pyridine, pyridine N-oxide or (C 8 H 17 ) 3 P=O], respectively, contrary to the above-considered data.…”

“…198 Judging from the enthalpies of formation, the acceptor abilities of tetracoordinate tellurium derivatives decrease in the series TeCl 4 > PhTeCl 3 > Ph 2 TeCl 2 . 198 It should be noted that Garad 199 assigned the 1 : 1 and 2 : 1 compositions to complexes of aryltellurium trichlorides with bidentate ligands (bipyridyl or phenanthroline) and monodentante ligands [pyridine, pyridine N-oxide or (C 8 H 17 ) 3 P=O], respectively, contrary to the above-considered data. 194 ± 197 Organyltellurium trihalides exhibit acceptor properties also with respect to sulfur-containing donors.…”