Interaction of Chromium(III) Complex of Glycylphenylalanine with Ninhydrin in Aqueous and Cetyltrimethylammonium Bromide (CTAB) Micellar Media

Dileep Kumar; Malik Abdul Rub; Mohamad Akram; Kabir-ud-Din

doi:10.3139/113.110296

Published by De Gruyter May 1, 2013

Interaction of Chromium(III) Complex of Glycylphenylalanine with Ninhydrin in Aqueous and Cetyltrimethylammonium Bromide (CTAB) Micellar Media

Wechselwirkung des Glycylphenylalanin-Chrom(III)-Komplexes mit Ninhydrin im wässrigen und mizellarem (Cetyltrimethylammoniumbromid (CTAB)) Medium

Dileep Kumar , Malik Abdul Rub , Mohamad Akram and Kabir-ud-Din

From the journal Tenside Surfactants Detergents

https://doi.org/10.3139/113.110296

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Abstract

In this paper, we are reporting the influence of cationic CTAB surfactant on the interaction of chromium(III) complex of glycylphenylalanine [Cr(III)-Gly-Phe]²⁺ with ninhydrin under varying experimental conditions. The reaction follows irreversible first-order reaction kinetics with respect to [complex] and fractional-order with respect to [ninhydrin]. With progressive increase in [CTAB], the rate constant (k_Ψ) for condensation of ninhydrin into [Cr(III)-Gly-Phe]²⁺ complex increased, reached a maximum value, and then decreased. The results are best accounted for by the distribution of substrate into micellar and aqueous pseudo-phases as well as combination of substrate molecules with surfactant molecule. On the basis of above results, template mechanism has been discussed.

Kurzfassung

Wir berichten über den Einfluss des kationischen Tensids CTAB auf die Wechselwirkung des Glycylphenylalanin-Chrom(III)-Komplexes [Cr(III)-Gly-Phe]²⁺ mit Ninhydrin unter verschiedenen experimentellen Bedingungen. Die Reaktion folgt einer irreversiblen Kinetik Erster Ordnung in Hinblick auf die Komplexkonzentration und einer Kinetik gebrochener Ordnung hinsichtlich der Ninhydrinkonzentration. Mit zunehmendem Anstieg der CTAB-Konzentration nimmt die Geschwindigkeitskonstante (k_Ψ) für den Einbau von Ninhydrin in den [Cr(III)-Gly-Phe]²⁺-Komplex zu; sie erreicht ein Maximum und fällt danach ab. Die Ergebnisse lassen sich am besten begründen mit der Verteilung des Substrats in der mizellaren und der wässrigen Pseudophase ebenso wie mit der Zusammenlagerung der Substratmoleküle mit den Tensidmolekülen. Auf Basis der Ergebnisse werden Templatmechanismen diskutiert.

Key words: Chromium(III) complex of glycylphenylalanine; [Cr(III)-Gly-Phe]2+; CTAB; Ninhydrin; Kinetics

Stichwörter: Glycylphenylalanin-Chrom(III)-Komplex; [Cr(III)-Gly-Phe]2+; CTAB; Ninhydrin; Kinetik

*Dr. Dileep Kumar, Department of Chemistry, Aligarh Muslim University, Aligarh-202 002, India, Tel.: +919452188336, E-Mail: dileepkmr271@gmail.com

Dr. Dileep Kumar received his M. Sc. and Ph. D. degrees from Aligarh Muslim University, (AMU) Aligarh. His current research interests are chemical kinetics, catalysis and surfactant systems.

Dr. Malik Abdul Rub received his M. Sc. and Ph. D. degrees from the Aligarh Muslim University. Now he has joined King Abdulaziz University as an associate Professor in the Center of Excellence for Advanced Materials Research. His current research interests are mixed micellization study of amphiphilic drugs with different additives, clouding phenomenon in amphiphilic systems, surfactant–surfactant interaction, surfactant–hydrotrope interactions and solubilization of polyaromatic hydrocarbons (PAH).

Dr. Mohd. Akram is currently associate Professor at AMU, Aligarh. He achieved his M. Sc. and Ph. D. degrees from the same university.

Prof. Kabir-ud-Din is currently a UGC-BSR Faculty Fellow at AMU, Aligarh, India, after completing a short stint as Emeritus Fellow. He has been a Professor of Physical Chemistry at the same university since 1993. He received his M. Sc. and Ph. D. degrees from AMU, Aligarh. He held post-doctoral positions at Prague (Czech Republic), Keele (UK) and Austin (USA). His research interests are in micellar catalysis, kinetics, electrochemistry, amphiphilic systems, and so on. He has authored over 300 research papers.

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Received: 2013-10-11

Revised: 2013-11-26

Published Online: 2013-05-01

Published in Print: 2014-03-17

Interaction of Chromium(III) Complex of Glycylphenylalanine with Ninhydrin in Aqueous and Cetyltrimethylammonium Bromide (CTAB) Micellar Media

Abstract

Kurzfassung

References

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