We report the results of deuterium NMR experiments performed on macrocyclic columnar mesogens. The columnar hexagonal mesophase, aligned in a static magnetic field, exhibits an unusual positive anisotropy of the diamagnetic tensor so that the column axes tend to orient themselves parallel to the direction of the applied field. A different kind of alignment can be detected when, by rotating the sample, the average columnar axes direction is made perpendicular to the field: the molecular cores tend to orient their long axis perpendicular to the field direction. This is the first case, to our knowledge, where a field-induced transversal alignment is observed in columnar mesophases. This peculiar alignment allowed the assignment of the flattened cone conformation to the macrocyclic core in the mesophase. © 1994 American Chemical Society.

Molecular conformation and magnetic behavior of macrocyclic columnar liquid crystals / Ricco, M.; Dalcanale, E.. - In: THE JOURNAL OF PHYSICAL CHEMISTRY. - ISSN 0022-3654. - 98:36(1994), pp. 9002-9008. [10.1021/j100087a031]

Molecular conformation and magnetic behavior of macrocyclic columnar liquid crystals

Ricco M.
;
Dalcanale E.
1994-01-01

Abstract

We report the results of deuterium NMR experiments performed on macrocyclic columnar mesogens. The columnar hexagonal mesophase, aligned in a static magnetic field, exhibits an unusual positive anisotropy of the diamagnetic tensor so that the column axes tend to orient themselves parallel to the direction of the applied field. A different kind of alignment can be detected when, by rotating the sample, the average columnar axes direction is made perpendicular to the field: the molecular cores tend to orient their long axis perpendicular to the field direction. This is the first case, to our knowledge, where a field-induced transversal alignment is observed in columnar mesophases. This peculiar alignment allowed the assignment of the flattened cone conformation to the macrocyclic core in the mesophase. © 1994 American Chemical Society.
1994
Molecular conformation and magnetic behavior of macrocyclic columnar liquid crystals / Ricco, M.; Dalcanale, E.. - In: THE JOURNAL OF PHYSICAL CHEMISTRY. - ISSN 0022-3654. - 98:36(1994), pp. 9002-9008. [10.1021/j100087a031]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2964856
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