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- W894794593 abstract "Spectral properties of (E)-1-[(2-hydroxynaphthalen-l-yl) methylene] semicarbazide (HNLSC) have been investigated by means of absorption and fluorescence spectra in different solvents. By increasing concentration of acid and base in different solvents, its different configurations were studied, and found that HNLSC was a typical compound with excited state intramolecular proton transfer (ESIPT). The molecule HNLSC exists mainly as the intramolecularly hydrogen bonded closed conformer in non-polar solvents, and shows ESIPT characteristics. Cyclohexane solvent and high acidity in the polar solvents HNLSC shows two bands at~415nm and~435nm, and found to be due to the normal fluorescence and the anomalistic ESIPT fluorescence respectively. In polarity proton solvents, there is a absorption band arises at 395 nm due to intermolecular hydrogen bonding between solute and solvent and the further deprotonation. Open conformer and the anion can block the intramolecular proton transfer channels, so fluorescence spectra of HNLSC in protonic solvent show only emission at~447nm. Further experiments by TEA and diluted sulfuric acid solution system regulating the polarity and the acidity of the environment, confirms HNLSC molecules exist in a variety of conversion balances of tautomer, not only cause by the change in hydroxyl on the naphthalene ring, but also enol and keto's intertransform structures domain of-CH=N-NH-CO-NH2." @default.
- W894794593 created "2016-06-24" @default.
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- W894794593 date "2010-09-25" @default.
- W894794593 modified "2023-09-23" @default.
- W894794593 title "激发态分子内质子转移分子2-羟基－1-萘甲醛半碳酰腙的光谱特性" @default.
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