THE SYNTHESIS, CRYSTAL, MOLECULAR AND ELECTRONIC-STRUCTURE OF [RECL3(NO)(OPPH3)(PPH3)] COMPLEX

A new rhenium(II) nitrosyl complex has been synthesized and characteri zed by IR, UV-VIS, NMR (H-1 and P-31) and magnetochemical measurements . Its ligand field parameters have been determined (Dq = 2810, Ds = -3 712 and Dt = 822 cm(-1)). The crystal and molecular structure of [ReCl 3(NO)(OPPh3)(PPh3)] has been solved by the heavy atom method and refin ed anisotropically to R = 5.52% for 7525 unique observed reflections. The crystals of [ReCl3(NO)(OPPh3)(PPh3)] contain distorted octahedral molecules, in which the triphenylphosphine ligand is trans with respec t to one chlorine atom and O-triphenylphosphine ligand is trans to nit rosyl group. The PPh3 and OPPh3 groups are cis. Re-CI bond trans to PP h3 [2.377(2) Angstrom] is longer than the mutually trans Re-Cl bonds [ 2.358(2) and 2.350(2) Angstrom]. The rhenium atom is pushed by 0.12 An gstrom towards nitrosyl ligand out of the least-squares plane defined by the atoms: Cl(1), Cl(2), Cl(3) and P(2).