Syntheses and characterization of imidodiphosphinoselenido complexes of V(IV), V(III), and Cr(III): [VO{N(SePPh2)2}2]·CH2Cl2, [V{N(SePPh2)2}3]·CH2Cl2, and [Cr{N(SePPh2)2}3]·CH2Cl2
摘要:
The imidodiphosphinoselenido complexes of V(IV), V(III), and Cr(III), [VO{N(SePPh2)(2)}]. CH2Cl2 (1), [V{N(SePPh2)(2)}(3)]. CH2Cl2 (2), and [Cr{N(SePPh2)(2)}(3)]. CH2Cl(2) (3), have been prepared from the reaction between VCl2(THF)(3) (1 and 2) or CrCl2 (3) and K[N(SePPh2)(2)] in CH2Cl2. These compounds have been characterized by single-crystal X-ray diffraction and spectroscopic techniques as well as by a magnetic susceptibility measurement for 3. In each of these compounds the [N(SePPh2)(2)](-) ligand exhibits an Se,Se,Se-bonding chelation to the metal center. In 1, two ligands are coordinated to a VO2+ unit to afford a pyramidal environment about V; in 2 and 3, three ligands are coordinated to each metal center to afford an octahedral geometry. (C) 2000 Elsevier Science S.A. All rights reserved.