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Partha Sarathi Mukherjee - One of the best experts on this subject based on the ideXlab platform.

  • electron rich triphenylamine based sensors for Picric Acid detection
    Journal of Organic Chemistry, 2015
    Co-Authors: Aniket Chowdhury, Partha Sarathi Mukherjee
    Abstract:

    This paper demonstrates the role of solvent in selectivity and sensitivity of a series of electron-rich compounds for the detection of trace amounts of Picric Acid. Two new electron-rich fluorescent esters (6, 7) containing a triphenylamine backbone as well as their analogous carboxylic Acids (8, 9) have been synthesized and characterized. Fluorescent triphenylamine coupled with an ethynyl moiety constitutes π-electron-rich selective and sensitive probes for electron-deficient Picric Acid (PA). In solution, the high sensitivity of all the sensors toward PA can be attributed to a combined effect of the ground-state charge-transfer complex formation and resonance energy transfer between the sensor and analyte. The Acids 8 and 9 also showed enhanced sensitivity for nitroaromatics in the solid state, and their enhanced sensitivity could be attributed to exciton migration due to close proximity of the neighboring Acid molecules, as evident from the X-ray diffraction study. The compounds were found to be quite ...

  • A fluorescent organic cage for Picric Acid detection
    Chemical communications (Cambridge England), 2014
    Co-Authors: Koushik Acharyya, Partha Sarathi Mukherjee
    Abstract:

    Dynamic covalent imine chemistry has been utilized to synthesize a fluorescent [3+2] self-assembled nanoscopic organic cage. The fluorescent nature of the reduced analogue of the cage was further exploited for the highly selective detection of the explosive Picric Acid (PA).

  • fluorescent tris imidazolium sensors for Picric Acid explosive
    Journal of Organic Chemistry, 2013
    Co-Authors: Bijan Roy, Arun Kumar Bar, Bappaditya Gole, Partha Sarathi Mukherjee
    Abstract:

    Two new anthracene-functionalized fluorescent tris-imidazolium salts have been synthesized, characterized, and proven to be selective sensors for Picric Acid, which is a common constituent of many powerful explosives. Theoretical studies revealed an unusual ground-state electron transfer from picrate anion to the sensor molecules.

Ramaswamy Murugavel - One of the best experts on this subject based on the ideXlab platform.

  • Triphenylbenzene Sensor for Selective Detection of Picric Acid
    Journal of Fluorescence, 2017
    Co-Authors: S. Nagendran, Pratap Vishnoi, Ramaswamy Murugavel
    Abstract:

    A C _3-symmetric triphenylbenzene based photoluminescent compound, 1,3,5-tris(4′-(N-methylamino)phenyl) benzene ([NHMe]_3TAPB), has been synthesized by mono-N-methylation of 1,3,5-tris(4′-aminophenyl) benzene (TAPB) and structurally characterized. [NHMe]_3TAPB acts as a selective fluorescent sensor for Picric Acid (PA) with a detection limit as low as 2.25 ppm at a signal to noise ratio of 3 . Other related analytes ( i.e. TNT, DNT and DNB) show very little effect on the fluorescence intensity of [NHMe]_3TAPB. The selectivity is triggered by proton transfer from Picric Acid to the fluorophore and ground-state complex formation between the protonated fluorophore and picrate anion through hydrogen bonding interactions. The fluorescence lifetime measurements reveal static nature of fluorescence quenching.

  • charge transfer aided selective sensing and capture of Picric Acid by triphenylbenzenes
    New Journal of Chemistry, 2015
    Co-Authors: Pratap Vishnoi, Saumik Sen, Naresh G Patwari, Ramaswamy Murugavel
    Abstract:

    A fluorescent chemo-sensor, 1,3,5-tris(4′-(N,N-dimethylamino)phenyl)benzene was synthesized by substituting the N–H protons of 1,3,5-tris(4′-aminophenyl)benzene with methyl groups. The chemo-sensor shows highly selective and remarkable fluorescence quenching in the presence of Picric Acid with a detection limit of 1.5 ppm. The origin of the selectivity was investigated using absorption, fluorescence emission and 1H NMR spectroscopic techniques. The solid state structure of 1,3,5-tris(4′-(N,N-dimethylamino)phenyl)benzene and its Picric Acid complex reveals multiple hydrogen bonds (N–H⋯O and C–H⋯O), π–π interactions and electrostatic interactions between 1,3,5-tris(4′-(N,N-dimethylamino)phenyl)benzene and Picric Acid. The proton transfer process from Picric Acid to 1,3,5-tris(4′-(N,N-dimethylamino)phenyl)benzene results in the formation of picrate anions and the triply protonated 1,3,5-tris(4′-(N,N-dimethylamino)phenyl)benzene species containing dimethylammonium (–NHMe2+) groups.

Christopher J. Destache - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Seven Fluoroquinolones on the Determination of Serum Creatinine by the Picric Acid and Enzymatic Methods
    The Annals of pharmacotherapy, 1993
    Co-Authors: Firouzan “fred” Massoomi, Herbert G. Mathews, Christopher J. Destache
    Abstract:

    OBJECTIVE:To investigate in vitro the interaction of seven fluoroquinolone antibiotics with the determination of serum creatinine by the Picric Acid and enzymatic methods.DESIGN:This blind, in vitro study assayed duplicate serum samples for creatinine by the Picric Acid and enzymatic methods with averaged spiked concentrations of 2.71, 13.56, 27.12, and 108.47 μmol/L of ciprofloxacin, fleroxacin, lomefloxacin, ofloxacin, 1-ofloxacin, sparfloxacin, and temafloxacin. Cefoxitin (in concentrations of 233.9, 1169.6, 1754.4, and 2339.2 μmol/L) was used as a positive control for the Picric Acid assay.SETTING:University-affiliated hospital, Department of Pharmaceutical Services and Clinical Chemistry section of the Department of Pathology.MAIN OUTCOME MEASURE:The serum creatinine samples spiked with the seven substituted fluoroquinolones and cefoxitin were assayed by both the Picric Acid and enzymatic assays. Statistical analysis compared the spiked samples with blank serum by Student's t-test and concentration r...

S. C. Mojumdar - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Picric Acid on SHG efficiency of tris (thiourea) zinc(II) sulphate (ZTS)
    Journal of Thermal Analysis and Calorimetry, 2014
    Co-Authors: P. Girija, S. Parthiban, S. C. Mojumdar
    Abstract:

    The influence of Picric Acid on second harmonic generation (SHG) of tris (thiourea) zinc(II) sulphate (ZTS) crystal is investigated. ZTS, a potential semi-organic nonlinear optical material, is doped with Picric Acid (1:1). Good quality crystals in the presence and absence of Picric Acid are grown by slow evaporation solution technique. XRD and FT-IR spectral analyses confirm that there is slight distortion in crystal structure due to doping. The surface morphology of the as-grown specimen which is changed with the nature and concentration of dopant is studied by scanning electron microscopy. TG–DTA study reveals that the sample is pure and there is no decomposition up to the melting point. Single crystal XRD indicates that the inclusion of Picric Acid is not to an appreciable extent. The SHG efficiency of the crystal is decreased substantially by the dopant.

Sanjio S. Zade - One of the best experts on this subject based on the ideXlab platform.

  • Highly emissive triphenylamine based fluorophores for detection of Picric Acid
    Tetrahedron Letters, 2014
    Co-Authors: Palas Baran Pati, Sanjio S. Zade
    Abstract:

    Abstract Triphenylamine based, dumbbell shaped, highly fluorescent compound 1 was designed and synthesized. Compound 1 showed blue emission with quantum efficiency as high as 0.78 in benzene solution. Compound 1 showed turn-off sensitivity to Picric Acid, which is a common constituent of many powerful explosives and unavoidable environmental threats. The turn-off sensitivity to Picric Acid is attributed to the excited state charge transfer from compound 1 to Picric Acid. Compound 1 selectively senses Picric Acid with a detection limit of ∼400 ppb.