Sm atoms in SmFe0.67 Ge1.33 are antiferromagnetically ordered with TN = 26°K, and with a Curie constant of 0.0737. Comparison with the Curie constant 0.082 of the free ion Sm3+, indicates that the Fe atoms do not contribute to the magnetic moment of the compound. The isomorphic GdFe(Co)0.4 Si1.6 compounds are paramagnetic above 4.2°K. The Fe and Co atoms are in a high spin state yielding Curie constants of 10.18 and 9.99 for the Fe and Co compounds respectively.
Primary normal alkylammonium halides crystallize in a preferred crystallographic orientation, forming single or twinned layers. The basal spacings are related to the number of carbon atoms within the homologous series, and are doubled in the twin layers. The orientation of the hydrocarbon chains between the ionic heads is discussed.
Long chain secondary ammonium chlorides, bromides and iodides crystallize in a preferred orientation. Values of the basal spacings of the salts indicate hydrocarbon chains oriented towards each other between planes of the ionic heads. The inclination angle of the chains was found to be 40°.
The interaction of lanthanide acetates with triethanolamine in pyridine medium yields mononuclear cationic complexes [Ln(teaH3)2(MeCOO)](MeCOO)2·0.5Py (teaH3 = N(CH2CH2OH)3, Py – pyridine) in cases Ln = Ce (1) and Pr (2), and binuclear heteroleptic complexes containing deprotonated triethanolamine [Ln2(MeCOO)4(teaH2)2] (Ln = Gd (3), Dy (4), Ho (5), and Er (6)). In the complexes of the first type, tetradentate chelating triethanolamine is a neutral ligand, while the metal core of the complexes of the second type is formed of lanthanide ions and bridging oxygen atoms of deprotonated teaH3. In the processes of thermal decomposition of complexes, systematic changes related to the character of the Ln3+ ions are noted. The complexes 1–6 were characterized by dc magnetic measurements, the Dy, Ho, and Er derivatives were also investigated in ac field. In the Gd complex, antiferromagnetic interactions between the Gd3+ ions were found. Results for complex 3, along with the literature data for eight complexes with the [Gd2O2] core, allowed to complement and to confirm the correlation between the value of the exchange interaction energy JGd–Gd′ and the interionic distances DGd…Gd′ for the complexes of this type that we found earlier. Complex of Dy exhibits field-induced slow relaxation of the magnetization.
