Ground and excited state proton transfer of some carbazole derivatives: a linear correlation between the acidity constant and charge density on the deprotonation centre

Purkayastha, Pradipta ; Ch. Bera, Subhash ; Chattopadhyay, Nitin (2000) Ground and excited state proton transfer of some carbazole derivatives: a linear correlation between the acidity constant and charge density on the deprotonation centre Journal of Molecular Liquids, 88 (1). pp. 33-42. ISSN 0167-7322

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0167-7322(00)00135-5

Abstract

The acidity constants of carbazole (CZ), 2-nitrocarbazole (NC), 2-methoxycarbazole (MOC) and 3-methylcarbazole (MC) have been determined in the ground as well as in the lowest excited singlet state. The excited state acidity constant (pK∗) has been estimated following Weller's fluorometric titration technique and the ground state acidity constant (pK) has been determined therefrom using the Förster cycle principle. Semi-empirical calculations (AM1-SCI) have been performed to calculate the charge density on the deprotonation centre (>N-) for the different probes. A good linear correlation exists between the acidity constants and the charge densities on the deprotonation centres in the respective electronic states.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:67477
Deposited On:31 Oct 2011 04:50
Last Modified:31 Oct 2011 04:50

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