Encapsulation of vanillylamine by native and modified cyclodextrins: Spectral and computational studies

Sivasankar, Thirugnanasambandam; Prabhu, A. Antony Muthu; Karthick, M.; Rajendiran, N.

doi:10.1016/j.molstruc.2012.06.025

Cited by 48 publications

(10 citation statements)

References 32 publications

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“…However, with α-CD/HP-α-CD solutions, the emission intensities of all the ABAs increased. Further, the absorbance and fluorescence intensity changes were different in α-CDs and β-CDs, which indicate all the CDs form different types of inclusion complexes [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Studies Of Abas With Cyclodextrinsmentioning

confidence: 99%

Guest-Host Inclusion Complex Formation of 2-, 3-, and 4-Aminobenzoic Acids with Native and Modified Cyclodextrins

Rajendiran

Thulasidhasan

Mamiro

2016

ILCPA

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Abstract. The inclusion complexation of 2-aminobenzoic acid (2ABA), 3-aminobenzoic acid (3ABA), and 4-aminobenzoic acid (4ABA) with α-cyclodextrin (α-CD), β-cyclodextrin (β-CD), hydroxypropyl-α-cyclodextrin (HP-α-CD) and hydroxypropyl-β-cyclodextrin (HP-β-CD) were studied in buffer solutions of different pHs (pH~1 and pH~7) and it was carried out using UV-Visible, steady-state and time-resolved fluorescence. Dual fluorescence was observed for all the compounds in aqueous and CD medium. All the ABAs forms 1:1 inclusion complex at pH ~ 1 solution and mixture of 1:1 and 1:2 inclusion complex at pH ~7. With CDs, dual luminescence appeared at pH ~ 1 indicates, both NH3+ and COOH groups are present in the interior of the CDs cavities. FT-IR, 1H NMR, results suggest ABAs formed a stable inclusion complex with the CDs.

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Section: Studies Of Abas With Cyclodextrinsmentioning

confidence: 99%

Guest-Host Inclusion Complex Formation of 2-, 3-, and 4-Aminobenzoic Acids with Native and Modified Cyclodextrins

Rajendiran

Thulasidhasan

Mamiro

2016

ILCPA

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“…A clear isosbestic point was observed in the absorption spectra and the changes were observed in the absorbance are very small. Further, no changes were observed in the absorbance of these solutions when recorded after 12 h. In general, the existence of an isosbestic point in the absorption spectra is indicative of the formation of well defined 1:1 complex [13][14][15][16][17][18][19][20][21][22][23][24][25]. With the addition of all the four CDs, the increase in absorbance along with a spectral shift indicates the formation of 1:1 HMBA/CD inclusion complexes.…”

Section: Cyclodextrin Effectsmentioning

confidence: 99%

“…In addition, CDs can mediate many organic reactions in which CDs represent a good model of mimicking enzymes [6,7] and have molecular recognition property to identify the small differences between compounds [8,9]. Due to the limitations of the experimental methods, in recent times molecular modeling has become very popular in CD chemistry [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Encapsulation of 4-hydroxy-3-methoxy benzoic acid and 4-hydroxy-3,5-dimethoxy benzoic acid with native and modified cyclodextrins

Rajendiran

Mamiro

2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…The binding energy of the isolated guest molecule was lower than that of the complex. [28,36] The higher negative energy (DE) values suggest that the SDIII and SDIV form thermodynamically favourable inclusion complexes. According to the semi-empirical calculation, there is no possibility of accommodating both dye molecules completely in to the CD's cavity.…”

Section: Molecular Modellingmentioning

confidence: 99%

Nanorod formation of cyclodextrin-covered sudan dyes through supramolecular self-assembly

Sankaranarayanan

Rajendiran

2013

Journal of Experimental Nanoscience

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Cyclodextrin-covered sudan III (SDIII) and sudan IV (SDIV) dyes produced various nanostructures such as pseudorotaxanes through supramolecular self-assembly, studied by absorption, fluorescence, time-resolved fluorescence, SEM, TEM, FT-IR, DSC, PXRD and 1 H NMR. Solvent study shows that azo-hydrazo tautomer is present in sudan dyes. Absorption and fluorescence spectroscopy data gave evidence for the formation of 1:2 inclusion complexes. Big nanorod ($36 nm) surrounded by small nanorod ($3 nm) was identified in SDIV/a-CD complexes. This confirms that the rigid molecular nanorod aggregates of a-CD and b-CD complexes are formed through the initial formation of smaller nanorods. An unequal morphology noticed in SDIII/CD suggests that the 1:2 inclusion complexes were self-assembled into irregular arrangement. The thermodynamic parameters (DH, DG and DS) of inclusion processes were determined from semi-empirical PM3 calculations.

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Encapsulation of vanillylamine by native and modified cyclodextrins: Spectral and computational studies

Cited by 48 publications

References 32 publications

Guest-Host Inclusion Complex Formation of 2-, 3-, and 4-Aminobenzoic Acids with Native and Modified Cyclodextrins

Guest-Host Inclusion Complex Formation of 2-, 3-, and 4-Aminobenzoic Acids with Native and Modified Cyclodextrins

Encapsulation of 4-hydroxy-3-methoxy benzoic acid and 4-hydroxy-3,5-dimethoxy benzoic acid with native and modified cyclodextrins

Nanorod formation of cyclodextrin-covered sudan dyes through supramolecular self-assembly

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