CRYSTAL-STRUCTURES, VIBRATIONAL-SPECTRA AND NORMAL-COORDINATE ANALYSES OF TRANS-[OSO2(OX)(2)](2-) AND TRANS-[OSO2(MAL)(2)](2-)

The crystal structures of trans-(Ph4P)(2)[OsO2(ox)(2)] (monoclinic, sp ace group P2(1)/n, a = 12.281(2), b = 14.5440(13), c = 13.9810(12) Ang strom, beta = 100.000(8)degrees, Z = 2) and trans-(n-Bu4N)(2)[OsO2(mal )(2)] (triclinic, space group <P(1)over bar>, a = 10.365(4), b = 10.70 7(3), c = 11.473(5) Angstrom, alpha = 73.00(2), beta = 64.44(3), gamma = 82.55(3)degrees, Z = 1) have been determined by single crystal X-ra y diffraction analysis. The LR and Raman spectra of these complexes we re measured at room temperature. Based on the molecular parameters of the X-ray determinations normal coordinate analyses have been performe d and the vibrations assigned. The valence force constants of [OsO2(ox )(2)](2-) are f(d)(Os=O) = 6.7 f(d)(Os-O) = 2.9, f(d)(C-O) = 5.05, f(d )(C=O) = 11.2 and f(d)(C-C) = 4.7 mdyn/Angstrom and of [OsO2(mal)(2)]( 2-) f(d)(Os=O) = 6.7, f(d)(Os-O) = 2.9, f(d)(C-O) = 4.86, f(d)(C=O) = 11.1 and f(d)(C-C) = 4.07 mdyn/Angstrom.