The crystal structures of 2-(2′-pyridyl)phenyltellurium(II) bromide and of the inclusion compound bis[2-(2′-pyridyl)phenyltellurium(II) chloride]·p-ethoxyphenyl-mercury(II) chloride

Intramolecularly Coordinated Low-Valent Organotellurium Complexes Derived from 1-(Dimethylamino)naphthalene

“…This distance is slightly longer than the typical (sp 2 )N···Te distance (2.24 Å);1a however, it may be considered significant since it is much shorter than Te···N distances in 4 and 5 . The Te−C(1) bond length compares with the 2.111(6) Å observed for the Te−C distance in (2-(2‘-pyridyl)phenyl)tellurium(II) bromide and the 2.125(16) Å observed for 2-(bromotelluro)- N -(p-tolyl)benzylamine . The Te−Br distance is characteristic of such distances and is intermediate between the 2.663(3) Å found for 2-(bromotelluro)- N -(p-tolyl)benzylamine 30 and the 2.71 Å for (2-(2-pyridyl)phenyl)tellurium(II) bromide …”

“…The Te−C(1) bond length compares with the 2.111(6) Å observed for the Te−C distance in (2-(2‘-pyridyl)phenyl)tellurium(II) bromide and the 2.125(16) Å observed for 2-(bromotelluro)- N -(p-tolyl)benzylamine . The Te−Br distance is characteristic of such distances and is intermediate between the 2.663(3) Å found for 2-(bromotelluro)- N -(p-tolyl)benzylamine 30 and the 2.71 Å for (2-(2-pyridyl)phenyl)tellurium(II) bromide 3 Molecular structure of [8-(dimethylamino)-1-naphthyl]tellurium(II) bromide ( 7 ). 4 Bond Lengths (Å) and Angles (deg) for 7 Te−Br2.672(1)C(3)−C(4)1.36(1) Te−N2.395(6)C(4)−C(10)1.40(1) Te−C(1)2.109(6)C(5)−C(6)1.35(1) N−C(8)1.463(9)C(5)−C(10)1.41(1) N−C(11)1.481(1)C(6)−C(7)1.39(1) N−C(12)1.49(1)C(7)−C(8)1.38(1) C(1)−C(2)1.37(1)C(8)−C(9)1.40(1) C(1)−C(9)1.42(1)C(9)−C(10)1.43(1) C(2)−C(3)1.41(1) Br−Te−N170.7(1)C(3)−C(4)−C(10)120.7(8) Br−Te−C(1)93.3(2)C(6)−C(5)−C(10)120.7(8) N−Te(1)−C(1)77.5(2)C(5)−C(6)−C(7)121.3(9) Te−N−C(8)106.4(4)C(6)−C(7)−C(8)119.2(8) Te−N−C(11)109.3(5)N−C(8)−C(7)121.4(7) Te−N−C(12)108.5(6)N−C(8)−C(9)116.8(6) C(8)−N−C(11)109.7(6)C(7)−C(8)−C(9)121.7(7) C(8)−N−C(12)114.2(7)C(1)−C(9)−C(8)122.2(7) C(11)−N−C(12)108.6(7)C(1)−C(9)−C(10)119.8(6) Te−C(1)−C(2)125.2(6)C(8)−C(9)−C(10)118.0(7) Te−C(1)−C(9)114.9(5)C(4)−C(10)−C(5)122.7(7) C(2)−C(1)−C(9)119.9(7)C(4)−C(10)−C(9)118.4(7) C(1)−C(2)−C(3)119.5(8)C(5)−C(10)−C(9)…”

Synthesis and structure of N-arylimines of β-tellurocyclohexenals with the intramolecular coordination N→Te bonds

“…118.5(9) C(10)-C(9)-C(8) 118.8(9) O(1)-C(21)-C (22) 108.8(11) Table 2 Bond lengths (Å ) and angles (°) in b-(acetoxyltellurenyl)cyclohexenylidene-(2,6-dimethylaniline) 11b…”

“…The intramolecular X ! Te coordination provides for the T-shaped configuration of tellurium centers with nearly linear arrangements of the X-Te-R bonds (for compounds 1, the angles XTeR are found within the range of 157-179°) v ¼ ðR Te þ R X Þ vdW À d TeX ðR Te þ R X Þ vdW À ðr Te þ r X Þ cov : 8 [21] (v = 0.62) 9 [22] (v = 0.91)…”

Synthesis, crystal structure and theoretical studies of aryltellurenyl tetramethylthiourea(tmtu) iodine complexes: Ph-Te(tmtu)I (1) and β-naphtyl-Te(tmtu)I (2)

“…Their synthesis has been performed by the reaction between equivalent amounts of halogen and the corresponding ditelluride [3][4][5][6] or by ligand exchange with sodium iodide [7]. Generally, aryltellurenyl halides are reactive compounds which can be stabilized by complexation with external ligands (L ¼ thioureas, selenoureas, triphenyl-phosphine) giving neutral tellurium(II) complexes of the [RTe(L)X] type with threefold co-ordinated tellurium atoms [8][9][10][11], by formation of anionic [RTeXY] À species through addition of a second halide [12], or by chelation with donor groups already incorporated in the molecule [13][14][15][16][17][18]. Non-derivatized aryltellurenyl halides, however, are sensitive compounds which can readily be oxidized to tellurium(IV) species.…”