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Acta Cryst. (2008). E64, m984-m985  [ doi:10.1107/S1600536808019296 ]

Tris(ethanol-[kappa]O)tris(picrato-[kappa]2O1,O2)lanthanum(III) tri-2-pyridylamine solvate

E. J. Chan

Abstract: The title compound, [La(C6H2N3O7)3(C2H6O)3]·C15H12N4, has two molecular building blocks, namely the neutral mononuclear adduct of lanthanum picrate with ethanol [i.e. La(pic)3:EtOH (1:3); La(pic)3 = lanthanum picrate and EtOH = ethanol] and the oligodentate aromatic nitrogen base tri-2-pyridylamine (tpa). The asymmetric unit contains two formula units. The compound was prepared during an investigation of the stereochemistry of lanthanoid picrate complexes with O-donor ligands. The metal-ligand adduct adopts a nine-coordinate tricapped trigonal-prismatic metal atom environment. The stereochemical arrangement of the ligands about the metal core is typical of a fac-isomer with stoichiometry M(bidentate)3(monodentate)3. Face-to-face hydrogen bonds are found between the tpa molecule and the ethanol ligands. One ethanol ligand is disordered over two positions, with site occupancy factors of ca 0.7 and 0.3. The oxygen atoms of a nitro group are also disordered over two positions; the site occupancy factors are ca 0.6 and 0.4.

Online 5 July 2008


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