LANTHANOID COMPLEXES .6. MONOMERIC HOMOLE PTIC LN(R(DO)CP)(3) COMPLEXES (LN=LA, ND) WITH AMINO-FUNCTIONALIZED CYCLOPENTADIENYL LIGANDS

The complexes Ln(Me(2)NC(2)H(4)Cp)(3) [Ln = Nd (2), La (3)] were synth esized by reaction of LnCl(3) with potassium cyclopentadienide 1 in te trahydrofuran (THF) at room temperature (1:3 molar ratio), while the s ame reaction of lutetium(III) chloride yields the complex Lu(Me(2)NC(2 )H(4)Cp)(2)Cl (4). These complexes sublime below 175 degrees C/10(-3) mm Hg. Single-crystal X-Ray structures performed for 2 and 3 reveal mo nonuclear structures. Crystals were obtained by slow evaporation of sa turated n-hexane solutions (2: space group Pbca, orthorhombic, a = 129 4.3(3) pm, b = 1711.8(1) pm, c = 4785.7(6) pm; V = 10603 x 10(6) pm(3) ; Z = 16; D = 1.385 g cm(-1); R = 0.055, RW = 0.058; 3: space group Cc , monoclinic, a = 1241.3(13), b = 2458.9(2), c = 859.0(3), beta = 98.8 5(2); V = 2590.6 X 10(6) pm(3); Z = 4; D = 1.404; R = 0.038, RW = 0.04 5). Structural details are explained in terms of the metal ionic radii of La-III and Nd-III, while in 2 the trivalent neodymium is coordinat ed by three eta(5)-cyclopentadienyl ligands and the nitrogen atom of o ne N-donor functionality (Nd-N2 2.73(1), Nd-N6 2.70(1) Angstrom), the larger lanthanum(III) centre of 3 is approached by a further nitrogen donor group (La-N2 2.898(6) Angstrom, La-N1 3.688(5) Angstrom).