Abstract
Lanthanide(III) complexes with composition Ln(nic)(H 2O) n (pic) 3(nic) (Ln=Pr, Nd n=8; Tm n=7) (pic=picrate, nic=nicotinamideN-O) were obtained by reaction of the hydrated lanthanide picrate with nicotinamideN-oxide in ethanol. They were characterized by elemental analysis and IR spectra. The molecular structures of Pr, Nd and Tm complexes were established by X-ray crystallography. Different triclinic phases have been detected for the isostructural Nd and Pr derivatives. They are nine coordinated to eight water molecules and a monodentate nic ligand while the apparently isomorphous Tm derivative looses a water molecule with a eight coordination number and a coordination geometry changing from tricapped trigonal prism (Pr, Nd) to square antiprismatic.
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