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Linear Free Energy Relationships and Optical Spectroscopy

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Advances in Linear Free Energy Relationships

Abstract

In this chapter we aim to provide a general indication of the present situation in the correlation of the frequencies and intensities of absorption bands with substituent effects. We have made no attempt to include all the extant references to this subject. Since 1947 many authors have compared spectral parameters with sigma values; however many of the series of compounds used were extremely limited in substituent type and many of the experimental procedures employed gave only approximate results, or are ill-defined. We have therefore usually omitted reference to such work. Further, in order to limit the length of this chapter we have not often discussed, or in many cases specifically mentioned, work published before 1960. Two books by C. N. R. Rao provide reasonable coverage of references to infrared1 and ultraviolet spectroscopy2 until 1960, and other summaries and reviews appeared in the 1950s and early 1960s covering correlations of features of infrared3–10 and ultraviolet11 spectra with substituent effects. More recent reviews12–15 of Linear Free Energy Relationships make little or no mention of correlation with quantities derived from optical spectroscopy. Thus, in his recent book, Wells12 makes only passing mention of the subject and, in fact, suggests that as far as the ultraviolet region is concerned ‘no real success has been obtained in attempts to correlate this type of spectroscopic data’. This, we believe, may give the erroneous impression that little progress has been made or can be made in this field. Equally, a recent review by Shorter15 devotes little space to correlations of infrared spectral results with sigma values and gives only one example for ultraviolet spectra.

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Katritzky, A.R., Topsom, R.D. (1972). Linear Free Energy Relationships and Optical Spectroscopy. In: Chapman, N.B., Shorter, J. (eds) Advances in Linear Free Energy Relationships. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8660-9_3

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  • DOI: https://doi.org/10.1007/978-1-4615-8660-9_3

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