New intercalation compounds of layered lanthanide oxychlorides LnOCl (Ln = Ho, Er, Tm, and Yb) with pyridine and substituted pyridines

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Chemistry of Materials; (United States)

DOI:https://doi.org/10.1021/cm00040a010· OSTI ID:7267561

Song, K; Kauzlarich, S M ^[1]

---

1. Univ. of California, Davis, CA (United States)

The lanthanide oxychlorides of Ho, Er, Tm, and Yb crystallize in the hexagonal space group, R[bar 3]m as a mixture of the SmSI- and YOF-type layered structures. The oxychlorides are prepared by heating Ln[sub 2]O[sub 3] (Ln = Ho, Er, Tm, and Yb) with excess NH[sub 4]Cl, followed by pyrohydrolysis. Crystalline phases of the lanthanide oxychlorides are obtained by heating LnOCl in LiCl/KCl fluxes at 450[degrees]C. The cell parameters obtained from X-ray powder diffraction are as follows: HoOCl, a = 3.7697, c = 27.766 [angstrom]; ErOCl, a = 3.745, c = 27.719 [angstrom]; TmOCl, a = 3.708, c = 27.72 [angstrom]; YbOCl, a = 3.704, c = 27.68 [angstrom]. A series of new pyridine intercalation compounds, (py)[sub x]LnOCl, have been prepared by reactions of pyridine with the LnOCl hosts. Intercalation compounds are characterized by X-ray powder diffraction, mass spectroscopy, elemental analysis, thermal gravimetric analysis, infrared spectroscopy, and temperature-dependent magnetic susceptibility. There is no reduction in the host lattice and pyridine apparently intercalates as the neutral molecule. An acid-base interaction is proposed for the mode of intercalation of pyridine into the lanthanide oxychlorides. Further studies on the intercalation of substituted pyridines, 4-ethylpyridine, and 2,6-lutidine, indicate that the C[sub 2] axis of pyridine is oriented perpendicular to the LnOCl layers. 38 refs., 7 figs., 6 tabs.

• OSTI ID: 7267561
• Journal Information: Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 6:4; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
AZINES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHLORINE COMPOUNDS
ERBIUM COMPOUNDS
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
HOLMIUM COMPOUNDS
KINETICS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYCHLORIDES
OXYGEN COMPOUNDS
OXYHALIDES
PYRIDINE
PYRIDINES
RARE EARTH COMPOUNDS
REACTION KINETICS
SPECTROSCOPY
THULIUM COMPOUNDS
YTTERBIUM COMPOUNDS