The X-ray crystal structure of bis(pentafluorophenyl)tellurium difluoride

Abstract

Bis(pentafluorophenyl)tellurium difluoride crystallizes, in the space group Cc, as a molecular solid in which pairs of crystallographically independent molecules are linked by two weak secondary [Formula: see text] interactions. (C12F12Te; a = 11.088(6), b = 20.040(10), c = 13.208(5); β = 109.07(4); U = 2774; Z = 8; fw = 499.7). The structural model was refined by full-matrix least-squares methods to a final residual of R1 = 0.035 for 1621 observed reflections. The stereochemistry of the primary bonding about Te is ψ-trigonal bipyramidal as for other R2TeX2 species and is compared with that of diphenyltellurium difluoride. Differences in the stereochemistry of the primary bonding about tellurium can be attributed to the influence of the more electron-withdrawing C6F5 group, and relates to the different secondary bonding and the crystal packing. 125Te nmr coupling constants, [Formula: see text], are reported for this and two related compounds. Previous 125Te Mössbauer data is discussed in the light of the structure.