INFRARED-SPECTRA OF NEW DIOXOURANIUM(VI) SOLID COMPLEXES WITH TRIDENTATE SCHIFF-BASES {[}UO2(SAL-OAP)(L)] (L=H2O, PY, DMF AND ET3N)

The new dioxouranium (VI) Schiff base complexes {[}UO2(sal-OAP)(H2O)], {[}UO2(sal-OAP)(py)], {[}UO2(sal-OAP)(DMF)] and {[}UO2(sal-OAP)(Et3N)](sal-OAP = orthoaminophenolsalicylidenciminato) have been prepared, and their i.r. spectra recorded and assigned on the basis of C(s) symmetry. The bond stretching force constants of the uranyl bonds, F(U=O), were calculated as 661.7 Nm -1, 676.1 Nm -1, 674.5 Nm-1 and 674.5 Nm-1 for {[}UO2(sal-OAP)(H2O)], {[}UO2(sal-OAP)(DMF)], {[}UO2(sal-OAP)(py)] and {[}UO2(sal-OAF)(Et3N)], respectively. The corresponding values of the U = O bond lengths were calculated to be 1.745 angstrom, 1.741 angstrom, 1.742 angstrom and 1.742 angstrom.