Ghosh, Ashish K. and Mukherjee, Ashok and Bagchi , Sanjib (2009) Absorption Spectrophotometric Study of Molecular Complexation of Asphaltene with Bromanil. Energy & Fuel , 23 (1). pp. 392-396. ISSN 0887-0624

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Abstract

It has been shown by UV-vis spectrophotometric method that p-bromanil forms inclusion complex of 1:2 stoichiometry with coal-derived asphaltenes. The absorption peak for the complex has been detected by difference spectral method and has been compared with those for complexes involving chloranils. The wavelengths of the maximum absorption are in the expected order of electron affinities of the chloranils and bromanil. The formation constants (K) have been determined using the Benesi-Hildebrand equation. The magnitudes of K are large compared to those of weak charge transfer complexes (for which K ≈ 101 to 103 dm3 mol-1) but are comparable to those of some recently reported supramolecular or inclusion complexes. The study reveals the presence of π-donor (i.e., aromatic) type of groups in asphaltene molecule. It also supports the view that bromanil molecules get included into structures provided by asphaltene molecules. Thermodynamic parameters ΔH° sand ΔS° for the complexation process have also been determined

Item Type:	Article
Subjects:	Fuel Scinece
Divisions:	UNSPECIFIED
Depositing User:	Dr. Satyendra Kumar Singh
Date Deposited:	19 Nov 2011 09:01
Last Modified:	19 Nov 2011 09:01
URI:	http://cimfr.csircentral.net/id/eprint/54

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