SYNTHESIS AND X-RAY CRYSTAL-STRUCTURE OF THE DICOPPER(I) COMPLEX OF 2-(DIPHENYLPHOSPHINO)PYRIDINE (PH2PPY) [CU2(MU-PH2PPY)2(CH3CN)2](PF6)2

The dicopper(I) complex with 2-(diphenylphosphino)pyridine (Ph2Ppy), [Cu2(mu-Ph2Ppy)2(CH3CN)2](PF6)2 has been prepared. The crystal structure has been determined crystallographically: Space group P1BAR, a = 10.807(6), b = 11.756(8), c = 8.606(7) angstrom, alpha = 90.36(6), beta = 95.98(5), gamma = 92.90(5)-degrees, Z = 1; R = 0.067. The two copper atoms are bridged by two Ph2Ppy molecules in a head-to-tail arrangement, resulting in a rare staggered conformation of the eight-membered ring Cu2P2-N2C2, whose factor is concerned with the coordination numbers of the central metal atoms. H-1 NMR studies show that the ligand of a CH3CN in the titled compound undergoes dissociation in acetone solution.