Professor Lothar Beyer zum 65. Geburtstag gewidmet Inhaltsu È bersicht. Die Pyridin-Komplexe [YCl 3 (Py) 4 ] (1), [LaCl 3 (Py) 4 ]´0,5 Py (2´0,5 Py) und [ErCl 3 (Py) 4 ]´0,5 Py (3´0,5 Py) entstehen durch Verdra È ngungsreaktion der Diacetonalkohol-Komplexe [LnCl 3 (DAA) 2 ] oder direkt aus den Trichloriden LnCl 3 mit u È berschu È ssigem Pyridin als farblose, wenig feuchtigkeitsempfindliche Kristalle. Sie werden durch ihre IR-Spektren und durch Kristallstrukturanalysen charakterisiert.1: Raumgruppe Pbca, Z = 16, Gitterkonstanten bei ±80°C: a = 1647,4(1); b = 1743,1(1); c = 3190,5(1) pm; R 1 = 0,031.2´0,5 Py: Raumgruppe P2 1 /n, Z = 4, Gitterkonstanten bei ±80°C: a = 978,9(1); b = 1704,5(1); c = 1589,5(1) pm; b = 103,61(1)°; R 1 = 0,0281.3´0,5 Py: Raumgruppe P2 1 /n, Z = 4, Gitterkonstanten bei ±80°C: a = 970,1(1); b = 1706,4(1); c = 1566,1(1) pm; b = 103,46(1)°; R 1 = 0,0232.Alle Komplexe haben monomere Moleku È lstrukturen mit dem Metallatom in verzerrt pentagonal-bipyramidaler Koordination. Eines der Chloratome und die vier Pyridin-Moleku È le sind a È quatorial angeordnet.Abstract. The pyridine complexes [YCl 3 (py) 4 ] (1), [LaCl 3 -(py) 4 ]´0.5 py (2´0.5 py), and [ErCl 3 (py) 4 ]´0.5 py (3´0.5 py) have been prepared from the diacetone-alcohol complexes [LnCl 3 (DAA) 2 ] or directly from the metal trichlorides with excess pyridine to give colourless, only sparingly moisture sensitive crystals. They were characterized by IR spectroscopy and by crystal structure determinations.1: Space group Pbca, Z = 16, lattice dimensions at ±80°C: a = 1647.4(1), b = 1743.1(1), c = 3190.5(1) pm, R 1 = 0.031.2´0,5 Py: Space group P2 1 /n, Z = 4, lattice dimensions at ±80°C: a = 978.9(1), b = 1704.5(1), c = 1589.5(1) pm, b = 103.61(1)°, R 1 = 0.0281. 3´0,5 Py: Space group P2 1 /n, Z = 4, lattice dimensions at ±80°C: a = 970.1(1), b = 1706.4(1), c = 1566.1(1) pm, b = 103.46(1)°, R 1 = 0.0232.All complexes realize monomeric molecular structures with the metal atom in a distorted pentagonal-bipyramidal coordination. One of the chlorine atoms and the four pyridine molecules are in the equatorial plane.
