NEODYMIUM(III) AND EUROPIUM(III) PICRATE COMPLEXES WITH 2-AZACYCLONONANONE: SPECTROSCOPY AND STRUCTURE

Abstract Complexes with composition Ln(pic) 3 ·3(aza) (Ln = Nd, Eu; pic = picrate; aza = 2-azacyclononanone) were characterized by IR absorption spectroscopy and elemental analysis. Visible absorption spectra for the Nd compound and emission spectra for the Eu compound were also recorded. X-ray single crystal diffraction analysis of the Eu compound shows that the picrates are bidentate, bonded through the phenolic and one o -nitrogroup oxygens and the 2-azacyclononanones are bonded through the carbonyl oxygens, forming a tricapped trigonal prism with D 3h symmetry distorted towards C 3v around the EU 3+ ion, which is in agreement with the emission spectra evidence.