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

N. Boden School of Chemistry, The University, Leeds, LS2 9JT, England

K. W. Jolley Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand

M. H. Smith Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand

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.

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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

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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

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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