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      Synthesis and Characterization of the Inclusion Complex of β-cyclodextrin and Azomethine

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          Abstract

          A β-cyclodextrin (β-Cyd) inclusion complex containing azomethine as a guest was prepared by kneading method with aliquot addition of ethanol. The product was characterized by Fourier Transform Infrared (FTIR) spectrometer, 1H Nuclear Magnetic Resonance ( 1H NMR) and Thermogravimetric Analyzer (TGA), which proves the formation of the inclusion complex where the benzyl part of azomethine has been encapsulated by the hydrophobic cavity of β-Cyd. The interaction of β-Cyd and azomethine was also analyzed by means of spectrometry by UV-Vis spectrophotometer to determine the formation constant. The formation constant was calculated by using a modified Benesi-Hildebrand equation at 25 °C. The apparent formation constant obtained was 1.29 × 10 4 L/mol. Besides that, the stoichiometry ratio was also determined to be 1:1 for the inclusion complex of β-Cyd with azomethine.

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          Physicochemical and release characterisation of garlic oil-β-cyclodextrin inclusion complexes

          Yanping Cao, Jing WANG, Baoguo Sun … (2011)
          Article 0 comments Cited 54 times – based on 0 reviews     Review now
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            Preparation and characterization of polypseudorotaxanes based on block-selected inclusion complexation between poly(propylene oxide)-poly(ethylene oxide)-poly(propylene oxide) triblock copolymers and alpha-cyclodextrin.

            Ya-Jun Li, Z. R. Zhou, X Ni … (2003)
            A series of new polypseudorotaxanes were synthesized in high yields when the middle poly(ethylene oxide) (PEO) block of poly(propylene oxide)-poly(ethylene oxide)-poly(propylene oxide) (PPO-PEO-PPO) triblock copolymers was selectively recognized and included by alpha-cyclodextrin (alpha-CD) to form crystalline inclusion complexes (ICs), although the middle PEO block was flanked by two thicker PPO blocks, and a PPO chain had been previously thought to be impenetrable to alpha-CD. X-ray diffraction studies demonstrated that the IC domains of the polypseudorotaxanes assumed a channel-type structure similar to the necklace-like ICs formed by alpha-CD and PEO homopolymers. Solid-state CP/MAS (13)C NMR studies showed that the alpha-CD molecules in the polypseudorotaxanes adopted a symmetrical conformation due to the formation of ICs. The compositions and stoichiometry of the polypseudorotaxanes were studied using (1)H NMR, and a 2:1 (ethylene oxide unit to alpha-CD) stoichiometry was found for all polypseudorotaxanes although the PPO-PEO-PPO triblock copolymers had different compositions and block lengths, suggesting that only the PEO block was closely included by alpha-CD molecules, whereas the PPO blocks were uncovered. The hypothesis was further supported by the differential scanning calorimetry (DSC) studies of the polypseudorotaxanes. The glass transitions of the PPO blocks in the polypseudorotaxanes were clearly observed because they were uncovered by alpha-CD and remained amorphous, whereas the glass-transition temperatures increased, because the molecular motion of the PPO blocks was restricted by the hard crystalline phases of the IC domains formed by alpha-CD and the PEO blocks. The thermogravimetric analysis (TGA) revealed that the polypseudorotaxanes had better thermal stability than their free components due to the inclusion complexation. Finally, the kinetics of the threading process of alpha-CD onto the copolymers was also studied. The findings reported in this article suggested interesting possibilities in designing other cyclodextrin ICs and polypseudorotaxanes with block structures.
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              Aromatic azomethine polymers and fibers

              Terry Pletcher, Stephanie Kwolek, Paul Morgan (1987)
              Article 0 comments Cited 17 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Int J Mol Sci
                Journal ID (iso-abbrev): Int J Mol Sci
                Journal ID (publisher-id): ijms
                Title: International Journal of Molecular Sciences
                Publisher: Molecular Diversity Preservation International (MDPI)
                ISSN (Electronic): 1422-0067
                Publication date Collection: 2013
                Publication date (Electronic): 07 February 2013
                Volume: 14
                Issue: 2
                Pages: 3671-3682
                Affiliations
                Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia; E-Mails: kavirajaa@ 123456live.com (K.P.S.); nmsarih@ 123456um.edu.my (N.M.S.); atiqahtariqa@ 123456yahoo.com (N.A.I.)
                Author notes
                [* ]Author to whom correspondence should be addressed; E-Mail: sharifahm@ 123456um.edu.my ; Tel.: +603-79676751; Fax: +603-79674193.
                Article
                Publisher ID: ijms-14-03671
                DOI: 10.3390/ijms14023671
                PMC ID: 3588064
                PubMed ID: 23434664
                SO-VID: 2b7eab27-27b2-4ba6-8240-97adf9b3619e
                Copyright © © 2013 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.
                License:

                This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/3.0/).

                History
                Date received : 08 December 2012
                Date revision received : 14 January 2013
                Date accepted : 25 January 2013
                Categories
                Subject: Article

                ScienceOpen disciplines: Molecular biology
                Keywords: β-cyclodextrin,azomethine,schiff bases,inclusion complex
                Data availability:
                ScienceOpen disciplines: Molecular biology
                Keywords: β-cyclodextrin, azomethine, schiff bases, inclusion complex

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