Structures of Iodopheyltellurium(II) and Diiododi-(#beta#-naphtyl)tellurium(IV)

摘要

The reactions between diphenyl ditelluride, (PhTe)_2, or di(#beta#-naphtyl)ditelluride, (#beta#-naphtylTe)_2, with equivalent amounts of iodine have been reinvestigated and the crystal and molecular structures of iodophenyltellurium(II), (PhTeI)_4, and diiododi-(#beta#-naphtyl)tellurium(IV), (#beta#-naphtyl)_2TeI_2, have been determined. The structure of iodophenyltellurium(II) (space group Cc, a = 13.850(5) A, b = 13.852(3) A, c = 16.494(6) A and #beta# = 101.69(2) deg, Z = 4) is built up by four PhTeI units which are linked by weak Te-Te interactions with Te-Te distances between 3.152(5) A and 3.182(4) A. The angles between the tellurium atoms are approximately 90 deg giving an almost perfect square. Long range secondary bonds (Te-I: about 4.2 A) link the tetrameric units to give an infinite two-dimensional network. Iodo(#beta#-naphtyl)tellurium(II) is less stable than the phenyl derivative. Solutions of this compound decompose under formation of elemental tellurium and (#beta#-naphtyl)_2TeI_2. (#beta#-Naphtyl)_2TeI_2 crystallises in the monoclinic space group C2/c (a = 21.198(6) A, b = 5.8921(8) A, c = 16.651(5) A, #beta# = 114.77(2) deg). The tellurium atom is situated on a two-fold crystallographic axis and Te-I and Te-C bond lengths of 2.899(1) and 2.108(7) A have been determined.