SYNTHESIS AND CHARACTERIZATION OF RHENIUM COMPLEXES WITH THE STABILIZING LIGAND TETRAKIS(PYRAZOL-1-YL)BORATE

The Re(VII)complex (Bpz4)ReO3 (1) has been isolated in the reaction of Re2O7 with KBpz4 in THF and characterized. The solid-state structure of this complex has been determined by X-ray crystallography. The comp lex is monomeric with an approximately octahedral arrangement of ligan ds around the rhenium and crystallizes in the monoclinic space group C 2/c, with a = 21.070(2) angstrom, b = 14.860(1) angstrom, c = 11.588(1 ) angstrom, beta = 121.70(1)degrees, V = 3087(4) angstrom3, Z = 8, R = 0.041, and R(w) = 0.047 for 227 variables and 2877 data with F(o) > 2 sigma(F(o)). The Re(V) complex (Bpz4)ReOCl2(2) with the same poly(pyra zolyl)borate ligand has also been isolated and characterized. Compound 2 has been synthesized by reacting compound 1 with Me3SiCl and Ph3P. For both complexes, the characterization includes laser desorption and electron impact Fourier transform ion cyclotron resonance mass spectr ometry.