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C 16 H 12 Cl 4 Te, ( 1 ),  M r   = 473.66,  P 2 1 / c ,  a  = 8.3919(9),  b  = 14.474(1),  c  = 14.585(1) Å,  β  = 94.057(9)°,  Z  = 4,  R  1  = 0.0378. C 16 H 12 Br 4 Te, ( 2 ),  M  r  = 651.50,  Pnma ,  a  = 19.159(2),  b  = 16.787(1),  c  = 5.781(1) Å,  Z  = 4,  R  1  = 0.0437. In both compounds the primary geometry about the Te IV  atom is a pseudo-trigonal-bipyramidal arrangement, with two halide atoms in apical positions, and the lone pair of electrons and C atoms in the equatorial plane. The Te IV  atoms are involved in secondary interactions resulting in the self-assembly of a chain-like supramolecular array in ( 1 ) and into a three dimensional supramolecular array in ( 2 ). Compound ( 1 ) has a  Z  configuration with the chlorine atom and the tellurium moiety bonded at the same side in adjacent atoms. In ( 2 ) the bromine atom and the dibromotellurium moiety are bonded at adjacent carbons in a  cis  fashion.

zeitschrift für kristallographie - crystalline materials

Dichloro-bis(2-chloro-2-phenyl-vinyl)Te(IV) and dibromo-bis(2-bromo-2-phenyl-vinyl)Te(IV): supramolecular self-assembly through different π-aryl interactions