Liesbet Jongen

Lanthanide(III) Dodecanoates: Structure, Thermal Behaviour, and Ion-Size Effects on the Mesomorphism

Rare-earth salts of dodecanoic acid (lauric acid) have been prepared and characterized. The compounds have the stoichiometry Ln(C11H23COO)3, where Ln = Y, La, Ce-Lu (except Pm). The thermal behaviour of these rare-earth dodecanoates has been investigated by hot-stage polarized optical microscopy, differential scanning calorimetry (DSC), thermogravimetry (TG), and high-temperature X-ray diffraction analysis. The compounds have a lamellar bilayer structure in the solid state, with the alkyl chains in an all-trans conformation normal to the ionic sublayer. The size of the

Thermal behaviour of lanthanum(III) alkanoates

The mesophase behaviour of the lanthanum(III) alkanoates [La(CxH2x+1COO)3] (x =3-19) has been investigated by hot-stage polarizing optical microscopy, differential scanning calorimetry and high-temperature X-ray diffraction. Lanthanum(III) butyrate monohydrate shows no mesomorphism, whereas for the remaining short chain homologues (x = 4-9) a highly viscous mesophase M and a smectic A phase were observed. The longer chain lanthanum(III) soaps (x = 10-19) exhibit only a smectic A phase. However, the chain length has a pronounced effect on the transition temperatures. The thermal behaviour of lanthanum(III) alkanoates is compared with that of other lanthanide(III) alkanoates.

Orbital order in the low-dimensional quantum spin system TiOCl probed by ESR

We present electron-spin-resonance data of

Mesomorphic behaviour of praseodymium(III) alkanoates

{\mathrm{Ti}}^{3+}

Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl.

{(3d}^{1})

Optical properties of vitrified rare-earth soaps

ions in single crystals of the novel layered quantum spin magnet TiOCl. The analysis of the g tensor yields direct evidence that the

Optical study of orbital excitations in transition-metal oxides

{d}_{\mathrm{xy}}

Crystal structure of lanthanum(III) butyrate monohydrate

orbital from the

Dipotassium hexa­chloro­tantalate(IV), K2TaCl6

{t}_{2g}