Charge–transfer complexes of pyrimidine Schiff bases with aromatic nitro compounds

Issa, Y. M.; Ansary, A. L.; Sherif, O. E.; Hassib, H.B.

doi:10.1016/j.saa.2011.03.022

Cited by 24 publications

(8 citation statements)

References 18 publications

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“…On the other hand, the charge-transfer reactions of certain p acceptors have been successfully utilized in pharmaceutical analysis [15][16][17]. They are also important in studying redox processes [18][19][20][21][22][23][24][25][26][27][28][29], second order nonlinear optical activity [30][31][32] and micro-emulsion [33]. Molecular complexes of the donor-acceptor type formed between aromatic amines and p acceptors were the subject of extensive studies [34].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, spectroscopic studies and thermal analysis of charge-transfer complex of 2,2′-bipyridine with 4-hydroxybenzoic acid in different polar solvents

Rzokee¹,

Ahmad²

2014

Journal of Molecular Structure

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Section: Introductionmentioning

confidence: 99%

Synthesis, spectroscopic studies and thermal analysis of charge-transfer complex of 2,2′-bipyridine with 4-hydroxybenzoic acid in different polar solvents

Rzokee¹,

Ahmad²

2014

Journal of Molecular Structure

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“…Equimolar quantities of 2-aminopyrimidine (0.01mol), substituted benzaldehyde (0.01mol) and 0.5ml acetic acid were refluxed for 3h with 20 mL of absolute ethanol [18,19]. The completion of the reaction was monitored by TLC continuously.…”

Section: Synthesis Of Substituted (E)-n-benzylidene-2-aminopyrimidinementioning

confidence: 99%

Synthesis, Spectral Correlations and Antimicrobial Activities of 2-Pyrimidine Schiff’s Bases

Senbagam¹,

Rajarajan²,

Vijayakumar³

et al. 2015

ILCPA

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ABSTRACT. In the present study, a series of substituted (E)-N-benzylidene-2-aminopyrimidine compounds have been synthesized by condensation reaction with 2-aminopyrimidine and meta-and para-substituted benzaldehydes. These synthesized Schiff's base compounds are confirmed by their physical constants, UV, IR and NMR spectral data. All the observed UV absorption maximum λ max (nm), IR frequencies νC=N(cm -1 ), NMR δ(ppm) of C-H & C=N chemical shifts have been correlated with Hammett substituent constants and F and R parameters using single and multi-linear regression analyses in order to study the effect of substituents on these spectral data has been studied. The antimicrobial activities of all the synthesized Schiff's base compounds have been studied using Bauer-Kirby disc diffusion method. 1.INTRODUCTION Schiff's bases are an important class of organic compounds possessing biological activities and structural significance. It has been proved that the incorporation of this molecule into the biologically active azomethine linkage (-CH=N-) produces compounds with high pharmacological activity [1]. Schiff's bases are represented by the general formula RCH=NR' where >C=N is the azomethine group [2]. The colour of the Schiff's bases is due to the presence of this azomethine (>C=N) linkage and can vary by introducing other auxochromic groups. When functional groups, such as -OH, -SH, -COOH are present in these ligands in suitably tailored positions, they enable them to be powerful chelating, biological and analytical reagents. On this basis of such groups present, the Schiff's bases may be di, tri, tetra or polydentate in nature. Compounds containing azomethine group are basic in nature, as N atom of this group has a lone pare of electrons and the double bond has electron donating character. Schiff's bases displayed the phenomenon of tautomeris[3], thermochromy and photochromy[4] and geometrical isomerism [5]. They possess both types of hydrogen bonding i.e. intra-molecular as well as inter-molecular [6]. Schiff's bases are widely studied and used in the fields of organic synthesis and metal ion complexation [7] for a number of reasons: their physiological and pharmacological activities [8] their use in ionselective electrodes [9] in the determination of heavy metals ions in environmental samples [10] and in the extraction of metals ions [11,12] and their many catalytic applications (e.g. for epoxidation of olefins, alkene cyclopropanation [13,14] trimethylsilylcyanation of ketones [15] asymmetric oxidation of methyl phenyl sulfide enantioselective epoxidation of silylenol [16] and ring-opening polymerization of lactide [17]. In recent years, correlation analysis has been applied by chemists for solving the effect of substituents on Schiff's bases through spectral data. Literature survey shows that there is no information available regarding the study of UV, IR and NMR spectral correlation and antimicrobial activities of substituted (E)-N-benzylidene-2-aminopyrimidine compounds. Hence the authors have taken efforts fo...

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“…A number of satisfactory chemosensors for NACs, with particular importance to TNT have been reported [1][2][3][4][5][6][7][8][9][10][11][12][13][14] to date. Mostly in all cases whether it is polymeric matrix, polymer imprinted fluorophore or electron rich discrete fluorophore, the fluorescence interaction exhibited quenching.…”

Section: Introductionmentioning

confidence: 99%

“…But in almost all cases only intensity based sensors are reported [1][2][3][4][5][6][7][8][9][10][11][12][13] till date. Wavelength ratiometric sensors for explosive are really scanty.…”

Section: Introductionmentioning

confidence: 99%

“…Wavelength ratiometric sensors for explosive are really scanty. Though analyte can modulate fluorescence emission in a number of ways, either by excited state or by ground state phenomena or even by a combination of the two, yet most chemosensors of NAC reported to date operate by the modulation of one photophysical process, namely the photoinduced electron transfer (PET) [1][2][3][4][5][6][7][8][9][10][11][12][13] and not the internal charge transfer (ICT) The only report of ICT is by Xu et al [14] for picric acid available as a ratiometric sensor to date to the best of our knowledge. Typically the Schiff base fluorophore contains both electron-donating and electron-accepting groups in its backbone.…”

Section: Introductionmentioning

confidence: 99%

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ICT based molecular recognition of 2,5-dinitrophenol in methanol

Chattopadhyay

Chaudhuri²,

Banerjee

2015

Journal of Luminescence

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Charge–transfer complexes of pyrimidine Schiff bases with aromatic nitro compounds

Cited by 24 publications

References 18 publications

Synthesis, spectroscopic studies and thermal analysis of charge-transfer complex of 2,2′-bipyridine with 4-hydroxybenzoic acid in different polar solvents

Synthesis, spectroscopic studies and thermal analysis of charge-transfer complex of 2,2′-bipyridine with 4-hydroxybenzoic acid in different polar solvents

Synthesis, Spectral Correlations and Antimicrobial Activities of 2-Pyrimidine Schiff’s Bases

ICT based molecular recognition of 2,5-dinitrophenol in methanol

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