Dual fluorescence of 2-(4′-N,N-dimethylaminophenyl)benzoxazole: effect of solvent and pH

Krishnamoorthy, G.; Dogra, S. K.

doi:10.1016/s0301-0104(99)00074-9

Cited by 34 publications

(22 citation statements)

References 39 publications

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“…These values are consistent with earlier results which showed that the nitrogens of the imine functions become more basic in the excited state S1. [37] Moreover, these results suggest a decrease of the repulsive interactions between the two positively charged halves of the (L 2 )H 2 2 + species in the excited state (Scheme 4). For aryl-containing polyamine receptors, it has been demonstrated that unprotonated amine and/or imine groups are in most cases efficient intramolecular electron transfer quenchers of the aromatic excited state (photoinduced electron transfer, PET).…”

mentioning

confidence: 89%

Acid–Base Sensors Based on Novel Quinone‐Type Dyes

Elhabiri

Siri

Sornosa-Tent

et al. 2003

Chemistry A European J

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We present a detailed study on the acid-base behaviour of a family of "potentially antiaromatic" p-benzoquinonediimine ligands. These 12pi electron molecules can be considered as constituted of two chemically connected but electronically not conjugated 6pi-electron subunits. Upon successive protonation, "mono" and "double" cyanine-type chromophores are generated in solution and allow a precise and sensitive spectrophotometric detection. These molecules represent a new class of tunable quinones whose electronic and structural properties can be triggered by proton input, as established by a complete physico-chemical study involving a combination of potentiometric and spectrophotometric methods (absorption and emission).

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confidence: 89%

Acid–Base Sensors Based on Novel Quinone‐Type Dyes

Elhabiri

Siri

Sornosa-Tent

et al. 2003

Chemistry A European J

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“…A clear isosbestic point is noticed, indicating that a 1:1 inclusion complex was formed between DABA and CDs. [22,23] In both a-CD and b-CD solutions, the increase in the absorbance indicates that the aromatic ring of the DABA is encapsulated in the CD cavity. [22À26] The emission spectra of the DABA molecule in different a-CD and b-CD concentrations are shown in Figure 2.…”

Section: Absorption and Emission Analysismentioning

confidence: 99%

Nanochain and vesicles formed by inclusion complexation of 4,4′-diaminobenzanilide with cyclodextrins

Rajendiran

Sankaranarayanan

Saravanan

2014

Journal of Experimental Nanoscience

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The nanochain-like agglomerates and spherical nanovesicles were formed from supramolecular self-assembly of 4,4 0 -diaminonenzanilide (DABA) with a-and b-cyclodextrins. The DABA with a-CD and b-CD inclusion complex nanomaterials were prepared and characterised by transmission electron microscopy, scanning electron microscopy, FTIR, differential scanning calorimetry, 1 H NMR and powder X-ray diffraction. 1 H NMR analysis indicated that the benzamido ring of DABA was encapsulated into the cyclodextrin (CD) cavity. Absorption and fluorescence spectral studies suggested that DABA forms different types of nanomaterials in a-CD and b-CD solutions. Higher occupied molecular orbital, lower unoccupied molecular orbital, and thermodynamic parameter values confirmed DABA dye entrapped in the CD cavities.

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“…The behavior of potential photosensitizing molecules can be understood through a variety of photophysical and photochemical studies e.g., the influence of various medium properties such as pH, ionic strength, chemical contents of the medium and solvatochromic effects in particular [7][8][9]. Fluorescence spectroscopy is used for examining any change in local microenvironment of broad range of molecules.…”

Section: Introductionmentioning

confidence: 99%