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Modeling and Optimisation of Comlexity by the β-Cyclodextrin of an Organic Pollutant Model: m-Methyl Red

Hassina Chekroud1, 2, Fayçal Djazi1, 2, Bouhadiba Abd alaziz1, Karima Horchani-Naifer3, Zeghdoudi Rachida3, Remache Malika1
1 Department of Petrochemistry and Process Engineering, Faculty of Technology, University August 20, 1955-Skikda, BP 26 Route El Hadaik, Skikda 21000, Algeria; 2 LRPCSI Laboratory, University of August 20, 1955, B.P 26 Skikda 21000, Algeria; 3 Laboratory of Physico-Chemistry of Mineral Materials and their Applications, National Center for Research in Materials Sciences, Technopole Bourj Cedria, Tunisia;
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Studies of cyclodextrin chemistry using quantum chemical methods are mainly adopted to investigate the formation of the inclusion complex causing changes in the physicochemical properties of the cyclodextrin guest. In this paper, we conducted a computational modeling study of the inclusion complexes of β-cyclodextrin (β-CD) with m-Methyl Red (m-MR) by using parametric method 6 (PM6), the semi empirical molecular orbital calculations and the natural bond orbital method (NBO). The inclusion process is carried out by maintaining the coordinates of the β-CD fixed and by displacing the guest molecule. The different relative positions between m-MR and β-CD are measured with respect to the distance between the reference atom (N) in the guest molecule and the origin of the coordinates from the equatorial plane of β-CD. The m-MR/β-CD (B) inclusion complex has a lower negative value of ΔG compared to another m-MR/β-CD (A) complex, highlighting the spontaneous behavior of the inclusion process. In addition, during the process of inclusion, the complexation energy is negative, which allows us to affirm that the complexation of m-MR in the β-CD is thermodynamically favorable. Among two directions A and B, the minimum energy generated from the PM6 was obtained in the orientation B and the guest molecule is partially encapsulated in the cavity of β-CD. In the NBO analysis, the stabilization energy is also usually used to characterize the hydrogen bond interaction between a lone pair (LP(Y)) of an atom Y and an anti-bonding orbital (BD٭(X-H)).

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