Synthesis, Structure and Spectroscopy of the Complexes Tetrakis μ-Trichloroacetato)Bis[Trichloroacetato-Ethanol-(1,10-Phenanthroline-N,N')LN(III)] (LN = Pr, Nd and Er)

Abstract

Tetrakis(μ-trichloroacetato)bis[trichloroacetatoethanol-(1,10-phenanthroline-N,N)Ln(III)] (Ln = Pr, Nd and Er) complexes have been synthesized and their crystal structures have been determined by X-ray diffraction at reduced temperatures. The three structures are isomorphous: monoclinic, P2 ₁/c. For the praseodymium complex, a = 12.418(6), b = 18.444(5), c = 17.742(9) Å, β0 = 131.71(3)°, R = 0.051, and R _w = 0.057. For the neodymium complex a = 12.396(6), b = 18.498(4), c = 17.339(8) Å, β = 131.50(2)°, R = 0.054, and R _w = 0.060. For the erbium complex a = 12.186(3), b = 18.462(4), c = 17.478(4) Å, β = 131.12(1)°, R = 0.041, and R _w = 0.045. Each lanthanide ion is coordinated by four bridging bidentate trichloroacetate ligands, one monodentate trichloroacetate ligand, one ethanol ligand and one phen-anthroline ligand, yielding a distorted square antiprismatic configuration. The two lanthanide ions are connected by the four bridging bidentate trichloroacetate ligands to form a dimer. The NMR spectra of the complexes confirm the coordination of ethanol ligands to the lanthanide ions.