Molecular Structure of α-Phenylselanyl-α-Acetylmethylenen Triphenylarsenium

摘要

cqvip:The molecular structure of the title compound, ph3AsC (COCH3 )Seph, has been determined by X--ray diffraction. Crystallographic data: Mr= 517. 36’monoclinic, P21,/c, a=11. 499(4), b=9. 619(4), c=20. 919(7),A, β=98. 82(2)°,V= 2286(l) A 3, Z=4, Dc= 1. 509 g/cm3, μ(MoKa) = 3. 073 cm-1, F(000) = 1040and the final R=0. 042, Rw= 0. 041. In the molecule, the geometry of arsenic atom isa distorted tetrahedron, the bonds of Se--C (3) and As--C(31 ) have striking characteristics of double bond, the delocalization of electronic density occurs to be restrictedfrom O(1 ) to Se atoms.