The charge transfer interaction energy against π-ionization energy plot for tetrachloro phthalic anhydride and a number of aromatic hydrocarbon and azahydrocarbon systems has been found to be linear with unit slope. The equilibrium constant for the charge transfer complexes has been found to increase with the lowering of the ionization energy of the donor, but the molar extinction coefficient-equilibrium constant relation was anomalous.

M CHOWDHURY

S BASU

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Transactions of the Faraday Society

The Benesi-Hildebrand equation and its modified forms have been rearranged to give equations which enable independent evaluation of K and ε{lunate} of molecular complexes from spectrophotometric data by graphical procedure. The equations have been tested with data on several 1:1 complexes. The results agree fairly well with those determined by other well-known procedures. © 1982.

Spectrochimica Acta Part A: Molecular Spectroscopy

Independent determination of equilibrium constant and molar extinction coefficient of molecular complexes from spectrophotometric data by a graphical method

The molecular charge-transfer absorption bands have been detected in mixtures of tetrahalo p-benzoquinones and polynuclear aromatic hydrocarbons in chloroform, carbon tetrachloride and methyl acetate solutions. The plot of charge-transfer interaction energies against ionization energies of hydrocarbons was found to be linear. For the isolated complexes, the charge transfer interaction was found to be in the order hv(iodanil)>hv (bromanil)>hv (chloranil) for all hydrocarbons, although in solution the order was anomalous. For the complexes of the same donor with different acceptors the oscillator strength of the charge-transfer absorption band was found to increase with an increase in equilibrium constant. No such correlation was noticed with complexes of different donors with the same acceptor. The equilibrium constant increased with the lowering of the ionization energy of the hydrocarbon. There was nearly a hundredfold increase in dipole moment of the complexes on electronic excitation. The evaluation of Mulliken's a and b coefficients showed that the charge transfer-complexes of tetrahalo p-benzoquinones with polynuclear aromatic hydrocarbons are weak complexes. © The Faraday Society and Contributors, 1964.

Charge transfer interaction between tetrahalo p-benzoquinones and polynuclear aromatic hydrocarbons

The absorption maxima and equilibrium constants of quinone-aromatic complexes have been determined spectrophotometrically. The charge-transfer transition energy is found to obey a linear relationship with ionization energy of hydrocarbons and aza-hydrocarbons. The equilibrium constants increase with decrease of ionization potential.

Journal	Transactions of the Faraday Society
Publisher	-
ISSN	0014-7672