Fluorescence and physical properties of the organic salt 2-chloro-4-nitrobenzoate–3-ammonium-phenol

Mani, Rajaboopathi; Rietveld, Ivo B.; Nicolaı̈, Béatrice; Krishnakumar, V.; Louhi-Kultanen, Marjatta; Narasimhan, S.

doi:10.1016/j.chemphys.2015.07.004

Cited by 11 publications

(2 citation statements)

References 46 publications

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“…Such a characteristic peak appears to be sharper and shifts to 1645 cm –1 in the desorption sample (Figure b, green curve), which is assigned to the CO stretch of corresponding protonated free acid at pH 5.0. In the former case, proton transfer in ammonium–carboxylate ion pairs existing between SiO 2 –PEI NPs and CDs accounts for the diminished absorption and relatively low wavenumber. In the latter case, the breakup of such ionic hydrogen bonds due to protonation of carboxylic acid groups of CDs leads to a blue shift together with the increased absorption.…”

Section: Preparation and Characterization Of The Two Bbsmentioning

confidence: 99%

Dynamic Hybrid Colloidosomes via Electrostatic Interactions for pH-Balanced Low Premature Leakage and Ultrafast Cargo Release

et al. 2019

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A trade-off between minimized premature leakage and rapid cargo release on demand is an intractable obstacle faced by smart delivery systems that restrains them from lab to market. To address this dilemma, dynamic hybrid colloidosomes relying on strong yet reversible electrostatic interactions are developed, simply through one-pot cooperative self-assembly of silica nanoparticles and fluorescent carbon dots at the interface of emulsion droplets. Specifically, pH-driven charge reversal of zwitterionic carbon dots leads to immediate electrostatic conversion between the two building blocks from attraction to repulsion. This makes robust locking and instantaneous breakdown of the colloidosomes subtly balanced, thus enabling low off-state leakage (10.5% over 7 days) while ultrafast on-state release (>90% within 5 min) upon an acidic stimulus. We envision that such biocompatible, traceable, and smart colloidosomes will offer unique opportunities for broad applications as on-demand release is desired.

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Section: Preparation and Characterization Of The Two Bbsmentioning

confidence: 99%

Dynamic Hybrid Colloidosomes via Electrostatic Interactions for pH-Balanced Low Premature Leakage and Ultrafast Cargo Release

et al. 2019

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“…The vibrational changes in the functional groups that are involved in hydrogen bonding such as carboxylate and N-H in the benzimidazole can be identified in the FTIR and the Raman spectra. 41 The N-H stretching vibration of benzimidazolium appears at 3139 cm −1 in the FTIR spectrum. 42 In general, aromatic C-H stretching vibrations appear in the region of 3080-3010 cm −1 in the FTIR and Raman spectra.…”

Section: Vibrational Analysismentioning

confidence: 99%

Crystal growth and physical properties of the organic salt benzimidazolium 3-nitrophthalate

Mekala¹,

Mani

Rietveld

et al. 2016

CrystEngComm

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From the point of view of crystal growth and design, it is interesting to study the effect of different isomers on the resulting structure. Single crystals of the organic salt benzimidazolium 3-nitrophthalate (BZD + •mNPA − ) have been grown by slow evaporation from methanol solution. Single crystal X-ray diffraction demonstrated that the crystal structure belongs to the monoclinic system with space group P2 1 /c. The properties of the functional groups have been studied by FTIR spectroscopy, FT-Raman spectral analysis and 1 H and 13 C NMR spectroscopy. The emission spectra of BZD + •mNPA − were recorded in different solvents; they exhibit a negative solvatochromatic effect when the polarity of the solvent is increased. The thermal stability, dielectric constant and dielectric loss have been investigated and the HOMO and LUMO energy levels have been calculated using density functional theory (DFT). The crystal structure of BZD + •mNPA − has been compared with that of benzimidazolium 2-nitroterephthalate (BZD + •NTPh − ). The interactions of the isomers 3-nitrophthalate or 2-nitroterephthalate salts with benzimidazolium are very similar; however, the different positions of the carboxyl groups on the benzene rings changes the layout of the structure, which leads to undulating sheets for 3-nitrophthalate and flat antiparallel sheets for 2-nitrotherephthalate. The salt decomposes at around 180 °C.

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Multifunctional properties of bio-supramolecular gel with their structural transformation and its applications

Sasikala

Mani

Vignesh

et al. 2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Fluorescence and physical properties of the organic salt 2-chloro-4-nitrobenzoate–3-ammonium-phenol

Cited by 11 publications

References 46 publications

Dynamic Hybrid Colloidosomes via Electrostatic Interactions for pH-Balanced Low Premature Leakage and Ultrafast Cargo Release

Dynamic Hybrid Colloidosomes via Electrostatic Interactions for pH-Balanced Low Premature Leakage and Ultrafast Cargo Release

Crystal growth and physical properties of the organic salt benzimidazolium 3-nitrophthalate

Multifunctional properties of bio-supramolecular gel with their structural transformation and its applications

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