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    • T Lekshmana Thanulingam

      Articles written in Journal of Chemical Sciences

    • Volume 104 Issue 3 June 1992 pp 431-436 Physical and Theoretical

      Correlation of ground and excited state dissociation constants oftrans-para- and ortho-substituted cinnamic acids

      R Murugesan B Rajasekar T Lekshmana Thanulingam A Shunmugasundaram

      More Details Abstract Fulltext PDF

      The ground and excited state dissociation constants oftrans- para- and ortho-substituted cinnamic acids have been determined in 50% (v/v) dioxan-water mixture at 30°C using the Forster cycle. The measured dissociation constants are analysed in the light of single and dual substituent parameter (DSP) equations. Excited state dissociation constants ofp-substituted cinnamic acids correlate well with the exalted substituent constants. The DSP method of analysis shows that resonance effect is predominant relative to inductive effect in the excited state than in the ground state for the para-substituted acids. The single parameter equation gives poor correlation for the ortho-substituted acids. However, the DSP analysis shows fairly good correlation. The inductive effect is predominant relative to the resonance effect in the excited state than in the ground state

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