SYNTHESIS AND STRUCTURE OF A BINUCLEAR UR ANYL COMPLEX WITH AN ACYCLIC, MULTIDENTATE AMINO ALCOHOL AS CHELATE LIGAND - SOLVENT-INDUCED SUPRAMOLECULAR STRUCTURE

The pentadentate Schiff base ligand alicylidene-2-(bis(2-hydroxyethyl) amino)ethylamine (H(3)sabhea) reacts with uranyl dinitrate hexahydrate in methanol or ethanol to yield the binuclear uranyl complex [{UO2(Hs abhea)}(2)]. Depending on the solvent two crystalline modifications ca n be isolated, which were studied by single-crystal X-ray diffraction: From ethanol [{UO2(Hsabhea)}(2)] (1) (monoclinic space group P2(1)/c, a = 1029.2(4) pm, b = 1342.9(6) pm, c = 1153.5(5) pm, beta = 109.88(3 )degrees, Z = 2); from methanol [{UO2(Hsabhea)}(2)].2/3MeOH (2) (tricl inic space group P (1) over bar, a = 1125.9(3) pm, b = 1347.4(4) pm, c = 1632.5(6) pm, alpha = 91.78(3)degrees, beta = 92.17(3)degrees, gamm a = 104.96(2)degrees, Z = 3). Differences between 1 and 2 are associat ed with the hydrogen bonding scheme involving the hydroxyethyl group a s the donor, but the uranyl oxo group as acceptor for 1 and the phenol ate oxygen atom as acceptor for 2. The compounds have been characteriz ed by vibrational (IR and Raman), NMR, and UV/Vis spectroscopy. The di fferences in the supramolecular structure of the compounds and the rel ated differences in their physical properties are discussed.