N,N-dialkylcarbamato lanthanide complexes, a series of isotypical coordination compounds

The preparations of the N,N-dialkylcarbamato complexes with analytical formulae [Ln(O2CNR2)(3)] (Ln = Pr, Nd, Eu, Gd, Ho, Er, Yb, Lu, R = iPr; Ln = Nd, Eu, Gd, R = Bu; Ln = Nd, R = Et), using [LnCl(3)(ether)(x)] (ether = THE or dimethoxyethane, DME), NHR2, and CO2 are reported. X-ray diffraction of the diisopropylcarbamato derivatives, including a reinvestigation of [Yb-4(O2CNiPr2)(12)], showed these complexes to be tetranuclear and isotypical over a range of 12 atomic numbers. The lanthanide contraction has been evaluated based on the lengths of four different types of Ln-O bond. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.