Twisting-based spectroscopic measure of solvent polarity: The PT scale

Wei Jen Lo, Yi Hui Chen, Kuangsen Sung

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


The PT scale, which is correlated well with the E T(30), Y, and Z scales, is the first twisting-based spectroscopic measure of solvent polarity. It is based on two combined mechanisms: (1) the solvent-dependent intramolecular charge-transfer absorption that displays a regular hypsochromic band shift in polar solvents and (2) overcoming the intramolecular hydrogen-bond of o-1 by its differentiated solvation in polar solvents, causing a C-C bond to twist that leads to a regular hypsochromic shift of its lowest energy electronic absorption band.

Original languageEnglish
Pages (from-to)5925-5931
Number of pages7
JournalJournal of Organic Chemistry
Issue number12
Publication statusPublished - 2013 Jun 21

All Science Journal Classification (ASJC) codes

  • Organic Chemistry


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