SYNTHESIS, CHARACTERIZATION AND POTENTIOMETRIC STUDIES OF TRANS-DIOXORHENIUM(V) COMPLEXES - X-RAY CRYSTAL-STRUCTURE OF [REO2(TN)(2)]I-CENTER-DOT-H2O

[ReO2(PPh(3))(2)I] has been used as starting material to prepare [(ReO 2)-O-v(tn)(2)]I (tn = trimethylenediamine) in high yield. The complex was characterized by elemental analysis and spectroscopic methods. The complex [ReO2(en)(2)]I (en = 1,2-diaminoethane) was prepared analogou sly for comparison. The crystal structure of [ReO2(tn)(2)]I . H2O was determined from X-ray data. It consists of a six-coordinate rhenium at om bonded to two trans-oxo groups. The amines lie in the equatorial pl ane, almost perpendicular to the ReO2 core. The average value for the Re-O bond is 1.76 Angstrom, similar to that in other Re(V) dioxo compl exes. The successive protonations of the oxo groups were determined fo r both complexes. Copyright (C) 1996 Elsevier Science Ltd