Metal-selenium interactions. Crystal structure of binuclear [(1 -iodo)-(2 - -iodo) (triphenyl selenophosphorane-Se)mercury(II)]2 complex

摘要

Reaction of mercury(II) diiodide with triphenyl selenophosphorane-Se (1:1 mole ratio) in acetone followed by recrystallisation of the product from chloroform formed crystals of stoichiometry {HgI2(Ph3PSe)}(1). Compound 1 existsas a centrosymmetric homobimetallic dimer, {Hg( -I)I(Ph3PSe)}2, as monoclinic crystals of space group e?‘?21/e?‘?. The dimer comprises two 2-iodo atoms that form unequal Hg-I bonds {2 8230(10), 3 1135(9) ?…} and two equal terminal Hg-I bonds {2 6524(10) ?…}. The Se atom of Ph3PSe forms terminal Hg-Se bond {2 5914(11)?…} and thus the geometry about each Hg centre is distorted tetrahedral and the range of tetrahedral bond angles is 92 97(2) to 130 85(3)?°, the largest being that of Se(1)-Hg(1)-I(1) and the shortest, I(2)-Hg(1)-I(2)a?—. Hg-Hg and I-I separations of {4 0930(11)?…} and {4 3097(15)?…} are more than the sums of their respective van der Waal radii {3 00 ?… and 4 24 ?…}.