Conductometric Studies of Molecular Complexes of Charge Transfer Type Formed between Aza-Aromatics and Haloanils

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Title:Conductometric Studies of Molecular Complexes of Charge Transfer Type Formed between Aza-Aromatics and Haloanils
Creators:
Randhawa, Harbhajan S.
Lakhani, Rajni
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 58, 4, pp. 783-790

Abstract

Electrical conductivity technique has been employed to investigate the molecular interaction of aza-aromatics viz. pyridine, α-pikoline, β-picoline and γ-picoline with haloanils, namely chloranil, bromanil and fluranil. The stoichiometry of the charge transfer (CT) complexes has been established and molar conductivities of the complexes determined employing the method of Gutmann and Keyzer. A model has been proposed for determining the equilibrium constant (<i>K</i>) of 1 : 1 molecular complexes of CT type by conductometric measurements. The model involves the assumption: 1/σ = [(1 + <i>K c</i><sup>0</sup><sub>A</sub>)/q<sub>d</sub><i>K c</i><sup>0</sup><sub>A</sub>] (1/<i>c</i><sup>0</sup><sub>D</sub>) + (1/q<sub>d</sub> <i>c</i><sup>0</sup><sub>A</sub>), where σ is the conductivity of the molecular complex, q<sub>d</sub> is the extent of depolarization of the complex, <i>c</i><sup>0</sup><sub>A</sub>) and <i>c</i><sup>0</sup><sub>D</sub>) are the initial concentrations of the acceptors and donors, respectively. The values of <i>K</i> and q<sub>d</sub> follows the expected trend of the conductometric parameters determined by the method of Gutmann and Keyzer as well as ionization potential of donors, thereby substantiating the validity of the model proposed. The observed and theoretical values of thermodynamic parameters for the aza-aromatic-chloranil systems that the interaction of aza-aromatics with haloanils is occurring through the lone pair of nitrogen ring.

Title:Conductometric Studies of Molecular Complexes of Charge Transfer Type Formed between Aza-Aromatics and Haloanils
Creators:
Randhawa, Harbhajan S.
Lakhani, Rajni
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:58
Number:4
Page Range:pp. 783-790
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19930783UNSPECIFIED
ID Code:196
Item Type:Article
Deposited On:06 Feb 2009 16:59
Last Modified:06 Feb 2009 15:59

Citation

Randhawa, Harbhajan S.; Lakhani, Rajni (1993) Conductometric Studies of Molecular Complexes of Charge Transfer Type Formed between Aza-Aromatics and Haloanils. Collection of Czechoslovak Chemical Communications, 58 (4). pp. 783-790. ISSN 0010-0765

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