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

Complexes with composition Ln(pic)(3).3(aza) (Ln=Nd, Eu; pic=picrate; aza=2-aza-cyclononanone) were characterized by IR absorption spectrosc opy and elemental analysis. Visible absorption spectra for the Nd comp ound and emission spectra for the Eu compound were also recorded. X-ra y single crystal diffraction analysis of the Eu compound shows that th e picrates are bidentate, bonded through the phenolic and one o-nitrog roup oxygens and the 2-azacyclononanones are bonded through the carbon yl oxygens, forming a tricapped trigonal prism with D-3h symmetry dist orted towards C-3v around the EU3+ ion, which is in agreement with the emission spectra evidence. (C) 1997 Elsevier Science Ltd.