A new type of dicopper structure with side arm coordinating triarylphosphane ligands

摘要

Treatment of P(C6H4CH2NMe2-2)(3) (1) with 2 equiv. of CuX (2a X = Cl, 2b X = Br) produces the novel dicopper complexes [P(C6H4CH2NMe2-2)(3)]Cu2X2 (3a X = Cl, 3b X = Br) in high yields. The X-ray structure of 3b was determined. Crystals of 3b are orthorhombic, space group Pna2(1), with a = 19.280(4) Angstrom, b = 15.717(3) Angstrom, c = 11.201(2) Angstrom, V = 3394(1) Angstrom (3), Z = 4, and final R-1 = 0.0573 [I greater than or equal to 2 sigma (I)] for 2301 reflections used (1621 reflection with I greater than or equal to 2 sigma (I)) and 340 variables. The structure of 3b consists of two copper(I) centers of which one copper atom possesses a heavily distorted trigonal-pyramidal environment, while the other one is almost square-pyramidal coordinated; the Cu2Br2 segment gives rise to a situation, which may be considered as a contact ion pair between Cu+ and CuBr2-. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 54]