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Location of the discotic lamellar-nematic tricritical point and isotope effects in the caesium pentadecafluorooctanoate (CsPFO)/water system as established by 133 Cs N.M.R. spectroscopy

1989; Taylor & Francis; Volume: 6; Issue: 4 Linguagem: Inglês

10.1080/02678298908034192

1366-5855

N. Boden, K. W. Jolley, Mark H. Smith,

Spectroscopy and Quantum Chemical Studies

Abstract 133Cs N.M.R. spectroscopy has been used to locate the discotic lamellar (smectic A)-nematic tricritical point in the CsPFO/H2O and CsPFO/2H2O systems. In both systems this occurs at the same volume fraction of 0·25, but at different temperatures (302·05 and 304·80 K, respectively). The phase diagram for the CsPFO/H2O system has also been studied for the first time and a comparison of the corresponding fixed points shows there to be large isotope effects.