Anisotropy of the magnetic susceptibility of mesogeneous lanthanide complexes

The anisotropic properties of a terbium-based liquid crystal complex

“…The obtained value ∆χ, that equals −12690 × 10 −6 cm 3 /mol, is one of the largest absolute values among the compounds using the same type of ligand environment but various lanthanide ions [13].…”

“…6a,b). The paramagnetic complex under study, as noted above, has a negative sign of the macroscopic anisotropy of the magnetic susceptibility [13]. In this case the long axes of the molecules Tb(CPDk 3−5 ) 3 Bpy 17−17 are perpendicular to the orienting magnetic field (Fig.…”

“…The sign of ∆χ was via optical birefringence measurements in a magnetic field (Cotton-Mouton effect) [13].…”

“…Rare examples of these compounds have a stable enantiotropic nematic phase within a wide temperature range, which was demonstrated by methods of differential scanning calorimetry and polarizing optical microscopy [11,12]. It was found that magnetic properties of lanthanidomesogens are strongly dependent upon the nature of the lanthanide ion and on the structure of the coordination center [13,14]. The first study of the dielectric properties of lanthanidomesogens -tris [1-(4-(4-propylcyclohexyl) [15,16].…”

Metallomesogens – Formation and Development

“…Важной особенностью полученных комплексов являлась их бифунк-циональность, а именно сочетание оптических свойств с регулируемой с помощью ориентации поляризацией излучения, т. е. появлялась возмож-ность управлять оптическими свойствами за счет ориентации образца или, другими словами, менять дихроичное отношение за счет магнитных и электрических полей. Были установлены факторы, определяющие магнитное и ориен-тационное поведение парамагнитных аддуктов трис(β-дикетонатов) лантаноидов в растворе и мезофазе [36].…”