Vaniyambadi, India
Vaniyambadi, India

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Boobalan G.,Annamalai University | Imran P.M.,Islamiah College | Nagarajan S.,Annamalai University
Superlattices and Microstructures | Year: 2012

Effect of side-chain length on self-assembly, optical and electrochemical properties of N,N′-di(1-pentylbutyl)perylene-3,4,9,10-tetracarboxylic bisimide and N,N′-di(1-hexylpentyl)perylene-3,4,9,10-tetracarboxylic bisimide has been studied. The photo-physical, thermal and electrochemical properties were studied using UV-Vis and fluorescence, differential scanning calorimetry, and cyclic voltammetry, respectively. The molecules self-assembled as 1D - rods and molecular bundles, self-assembly was studied using SEM, optical and fluorescence microscopic techniques. The results concluded that the compound with short tail exhibits low solubility and self-assembled faster. The photo-physical properties of the compounds were not much affected by varying the alkyl chain length. The compounds geometries were optimized at 6-31G using DFT and the potentials were correlated with molecular orbitals. © 2012 Elsevier Ltd. All rights reserved.

Boobalan G.,Annamalai University | Imran P.M.,Islamiah College | Nagarajan S.,Annamalai University
Chinese Chemical Letters | Year: 2012

Designed and synthesized a new highly water soluble N,N′-bis(2-((5- ((dimethylamino)methyl)furan-2-yl)methylthio)ethyl)perylene-3,4,9, 10-tetracarboxylic diimide from 2-((5-((dimethylamino)methyl)furan-2-yl) methylthio)ethanamine and perylene-3,4,9,10-tetracarboxylic dianhydride. The compound was characterized by 1H, 13C, 2D NMR, mass and IR techniques. The compound is highly fluorescent with good solubility in water and other polar solvents. © 2011 Samuthira Nagarajan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

Boobalan G.,Annamalai University | Imran P.M.,Islamiah College | Nagarajan S.,Annamalai University
Supramolecular Chemistry | Year: 2012

Well-defined nanobelts with strong fluorescence were fabricated from a perylene tetracarboxylic diimide molecule modified with specific side-chain substitution. The new perylene diimide was characterised by 1H, 13C NMR, mass and IR spectral techniques. The photophysical and electrochemical properties were investigated by UV-vis absorption, fluorescence, differential scanning calorimetry and cyclic voltammetry. 1D nanobelt self-assembly of the compound was studied with optical, fluorescence and scanning electron microscopic techniques. The observed self-assembly was supported by computational studies using density functional theory and natural bond order analysis. The optimised molecule was fit into crystal space theoretically, and the observed band gap was correlated well with optical and electrical properties. © 2012 Copyright Taylor and Francis Group, LLC.

Boobalan G.,Annamalai University | Imran P.M.,Islamiah College | Nagarajan S.,Annamalai University
Journal of Electronic Materials | Year: 2011

Highly fluorescent and water-soluble N,N′-bis(2-((5-((dimethylamino) methyl) furan-2-yl)methylthio)ethyl)perylene-3,4,9,10-tetracarboxylic diimide was synthesized, and characterized using various spectral techniques. The compound was highly fluorescent and exhibited strong absorption and emission in the visible spectral region. Computational studies predicted the highest occupied molecular orbital to lowest unoccupied molecular orbital band gap as 1.96 eV. The molecule self-assembled into a novel ball-like structure unlike the expected one-dimensional nanowire or nanobelt of other perylene bisimides. Molecular geometry optimization and computational studies at density functional theory as well as semiempirical levels strongly supported the observed self-assembly. © 2011 TMS.

Boobalan G.,Annamalai University | Imran P.K.M.,Islamiah College | Manoharan C.,Annamalai University | Nagarajan S.,Annamalai University
Journal of Colloid and Interface Science | Year: 2013

Perylene diimides are typical n-type organic semiconductors with interesting optical and electronic properties. Versatile properties of these compounds are deeply related to the morphologies of the self-assembled nanostructures. Self-assembled strong red fluorescent nanofibers of N,. N'-bis(1-dodecyl)perylene-3,4,9,10-tetracarboxylic diimide (D-PTCDI) were successfully prepared by a solution based phase-transfer method. Morphology of the nanostructure was characterized by optical, fluorescence, scanning, and transmission electron microscopic techniques. Observed molecular self-assembly was supported by the computational predictions. Thin film of the D-PTCDI was casted on glass substrate by spin-coating. UV-vis absorption maximum of the thin film was shifted to longer wavelength than in solution. Conducting properties of the thin films were evaluated by current-voltage measurements. © 2012 Elsevier Inc.

Mansoor S.S.,C Abdul Hakeem College | Shafi S.S.,Islamiah College
Journal of Molecular Liquids | Year: 2010

The oxidation of benzyl alcohol (BnOH) and a few para-substituted benzyl alcohols by tripropylammonium fluorochromate (TriPAFC) in dimethylsulphoxide (DMSO) leads to the formation of corresponding aldehydes. The reaction is first order each in TriPAFC and the alcohols. The reaction is catalysed by hydrogen ions. The hydrogen ion dependence has the form: kobs = a + b[H +]. The oxidation of α α′-dideuterio benzyl alcohol exhibited a substantial primary kinetic isotope effect (kH/k D = 5.45 at 303 K). Oxidation of benzyl alcohol was studied in 19 different organic solvents. The solvent effect has been analysed using Kamlet's and Swain's multiparametric equation. A mechanism involving a hydride ion transfer via chromate ester is proposed. © 2010 Elsevier B.V. All rights reserved.

Suresh A.S.,Islamiah College | Suresh A.S.,Syngene International Ltd | Baburajan P.,Syngene International Ltd | Ahmed M.,Islamiah College
Tetrahedron Letters | Year: 2014

A simple one-pot synthesis of phthalazinones by the condensation and intra-molecular carbonylative cyclization of 2-bromobenzaldehydes with hydrazines is reported. This method utilizes solid Co2(CO) 8 as carbonyl source making it readily accessible in small-scale laboratory applications. © 2014 Elsevier Ltd. All rights reserved.

Sheik Mansoor S.,C Abdul Hakeem College | Syed Shafi S.,Islamiah College
Arabian Journal of Chemistry | Year: 2014

The oxidation kinetics of some para-substituted anilines by benzimidazolium fluorochromate (BIFC) have been studied in aqueous acetic acid media in the presence of perchloric acid. The reaction is first order with respect to both aniline and BIFC and is catalysed by a hydrogen ion. The rate data obey Hammett relationship. The products of oxidation are the corresponding azo benzenes. Based on the kinetic results and product analysis, a suitable mechanism has been proposed for the reaction of BIFC with anilines. © 2010.

Mansoor S.S.,C Abdul Hakeem College | Shafi S.S.,Islamiah College
Reaction Kinetics, Mechanisms and Catalysis | Year: 2010

The kinetics of oxidation of benzhydrols (BH) by tributylammonium chlorochromate (TriBACC) to the corresponding benzophenones have been studied. The reaction is first order each in the concentration of TriBACC, benzhydrol and H+. The oxidation of (α-C-D) benzhydrol indicates the presence of a primary kinetic isotope effect. The reaction rate have been determined at different temperatures and activation parameters calculated. With an increase in the amount of acetic acid in its aqueous mixture, the rate increases. The reaction does not induce polymerization of acrylonitrile. A mechanism involving hydride ion transfer has been proposed. © Akadémiai Kiadó, Budapest, Hungary 2010.

Andrews B.,Islamiah College | Ahmed M.,Islamiah College
Asian Journal of Chemistry | Year: 2013

In the present investigation, synthetic methods of 4-aryl-6-methyl-2-oxo-1, 2,3,4-tetrahydro pyrimidine-(5)-1,3,4-thiadiazole-2-amine (3) and 4-aryl-6-methyl-2-oxo-1,2,3,4-tetrahydro pyrimidine-(5)-1,3,4-oxadiazole-2-amine (3a) and 4-aryl-6-methyl-2-oxo-1,2,3,4-tetrahydro pyrimidine-(5)-1,3,4- triazole-2-thiol derivative (3b) are described. Compound 1 is converted to carbothiamide 2 by the reaction with ethyl ester followed by thiosemicarbazide. Compound 2 acts as key intermediate for all series of the final compounds. In one pathway, 2 is converted to corresponding thiadiazole 3 by treatment with conc. H2SO4 and NH3 and compound 3a by treatment with I2 followed by KI and NaOH and compound 3b by treatment with 10 % of NaOH to furnish the final compound. Structural elucidation is accomplished by IR, 1H NMR and mass spectral data of the synthesized compounds.

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