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NMR basic principles and progress. Volume 9: Lyotropic liquid crystals
JOURNAL
OF MAGNETIC
RESONANCE
241,471
(1976)
Book Review NMR Basic Principles and Progress. Volume 9: Lyotropic Liquid Crystals. C. 2. Khetrapal, A. C. Kunwar, A. S. Tracey, and P. Diehl. Springer-Verlag, New York/ Heidelberg/Berlin, 1975. 85 pages. $16.40.
NMR spectroscopy of solutes partially oriented in nematic lyotropic liquid crystalline materials was reported by Lawson and Flautt in 1967, but interest and activity in this area was initially slow to develop in spite of the widespread occurrence and the potential importance of multicomponent mesophase systems. In fact, the first volume in this NMR series only seven years ago carried a review of NMR studies of molecules oriented in (thermotropic) nematic liquid crystals which devoted but four lines in passing mention of lyotropic media, The present survey is the first to be devoted exclusively to lyotropic systems, and with its more than 450 references, reflects the very substantial and still growing interest in the subject. The review is both systematic and comprehensive. A well-organized table of contents provides ready access to the topics covered. Space is about equally divided between NMR studies of lyotropic phases themselves and the use of these phase as partially ordering solvents for NMR studies. The extensive, documented tabulations of systems studied in both these groups should prove very valuable. Literature coverage of NMR topics appears complete and up to date, but readers interested in the nature of mesophase systems will probably want to consult additional specialized sources. The authors state (p. 17) that the spectral spread of solutes is usually much smaller in lyotropic than in thermotropic media (and correspondingly for the ordering). They also suggest (p. 56) that lower ordering of solutes can be correlated with higher solubilities in water. While thesle statements may be true in many cases there are now significant exceptions (e.g., pyridine, cresol) suggesting the need for detailed consideration of individual cases. Apart from a few such minor comments, however, the review turns out to provide very useful and readable coverage of an interesting and active area of NMR spectrascopy. J. H. GOLDSTEIN R. C. LONG, JR. Department of Chemistry Emory University Atlanta, Georgia
Copyright Q 1976 by Academic Press, Inc. All rights of reproduction in any form reserved. Printed in Great Britain
471
OF MAGNETIC
RESONANCE
241,471
(1976)
Book Review NMR Basic Principles and Progress. Volume 9: Lyotropic Liquid Crystals. C. 2. Khetrapal, A. C. Kunwar, A. S. Tracey, and P. Diehl. Springer-Verlag, New York/ Heidelberg/Berlin, 1975. 85 pages. $16.40.
NMR spectroscopy of solutes partially oriented in nematic lyotropic liquid crystalline materials was reported by Lawson and Flautt in 1967, but interest and activity in this area was initially slow to develop in spite of the widespread occurrence and the potential importance of multicomponent mesophase systems. In fact, the first volume in this NMR series only seven years ago carried a review of NMR studies of molecules oriented in (thermotropic) nematic liquid crystals which devoted but four lines in passing mention of lyotropic media, The present survey is the first to be devoted exclusively to lyotropic systems, and with its more than 450 references, reflects the very substantial and still growing interest in the subject. The review is both systematic and comprehensive. A well-organized table of contents provides ready access to the topics covered. Space is about equally divided between NMR studies of lyotropic phases themselves and the use of these phase as partially ordering solvents for NMR studies. The extensive, documented tabulations of systems studied in both these groups should prove very valuable. Literature coverage of NMR topics appears complete and up to date, but readers interested in the nature of mesophase systems will probably want to consult additional specialized sources. The authors state (p. 17) that the spectral spread of solutes is usually much smaller in lyotropic than in thermotropic media (and correspondingly for the ordering). They also suggest (p. 56) that lower ordering of solutes can be correlated with higher solubilities in water. While thesle statements may be true in many cases there are now significant exceptions (e.g., pyridine, cresol) suggesting the need for detailed consideration of individual cases. Apart from a few such minor comments, however, the review turns out to provide very useful and readable coverage of an interesting and active area of NMR spectrascopy. J. H. GOLDSTEIN R. C. LONG, JR. Department of Chemistry Emory University Atlanta, Georgia
Copyright Q 1976 by Academic Press, Inc. All rights of reproduction in any form reserved. Printed in Great Britain
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