Wide temperature range mesomorphic behaviour of highly fluorinated 15‐membered macrocycles and their open trisulphonamide precursor

Abstract

The mesomorphic properties of 15‐membered azamacrocycles containing long hydrocarbon or highly fluorinated long chains have been explored along with those of their open precursors. The liquid crystalline behaviour is determined by the presence of different heteroatoms or long fluorinated chains and the substitution pattern of the aryl units of the sulphonamides. The presence of highly fluorinated long chains in the para position with regard to the sulphonamide group was found to favour the formation of smectic mesophases with wide temperature ranges. All of the mesophases were studied by polarizing optical microscopy and differential scanning calorimetry.

**Deceased on 20^th February 2006.

Acknowledgements

We acknowledge financial support from “Ministerio de Educación y Ciencia” of Spain (Projects BQU2002‐04002 and CTQ‐2005‐04968/BQU), C.I.C.Y.T. (MAT 2003‐07806‐CO2‐01) and “Generalitat de Catalunya” (Projects 2001SGR00181 and 2005SGR00305). One of us (R.M.S.) has been incorporated into the research group through a “Ramón y Cajal” contract (MCYT‐FEDER/FSE). The “Ministerio de Educación y Ciencia” is also gratefully acknowledged for predoctoral scholarships to R.S., E.B. and F.V.

Notes

**Deceased on 20^th February 2006.