MIXED-LIGAND COMPLEXES OF RHENIUM .2. SYNTHESIS AND CHARACTERIZATION OF [REN(X)(ME(2)PHP)(2)(R(2)TCB)] COMPLEXES (X=I, N(3), SCN, CN R(2)TCB(-)=N-(N,N-DIALKYLTHIOCARBAMOYLBENZAMIDINATE)) - X-RAY CRYSTAL-STRUCTURE OF [REN(N-3)(ME(2)PHP)(2)(ET(2)TCB)]

Mixed-ligand complexes of rhenium(V) of the general formula [ReN(X)(Me(2)PhP)(2)(R(2)tcb)] with X = I, N-3, SCN and CN, have been synthesized from [ReN(Cl)(Me(2)PhP)(2)(R(2)tcb)] and NaX or KX salts. All complexes were characterized by IR and NMR spectroscopy and mass spectrometry. [ReN(N-3)(Me(2)PhP)(2)(Et(2)tcb)] was studied by X-ray diffraction. The complex crystallizes triclinic in the space group P ($) over bar 1, Z = 2, R = 0.043 for 4809 observed independent reflections. The lattice dimensions are a = 10.142(3), b = 11.425(4), c = 13.603(4) Angstrom, alpha = 88.52(2), beta = 78.22(2) and gamma = 88.30(2)degrees. The azido ligand is coordinated trans to the ReN bond which is 1.733(8) Angstrom. The Re-N-3 bond length is 2.323(9) Angstrom. The coordination geometry is a distorted octahedron.