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Substituent effects on 4,4 ' - disubstituted nitrogen benzylidene aniline derivative spectra properties and molecular structure of

Author: LuBingTao
Tutor: CaoChenZhong
School: Hunan University of Science and Technology
Course: Chemistry
Keywords: Substituent effects 4 , 4' - di-substituted benzylidene aniline derivatives of nitrogen UV spectrum Interaction substituent
CLC: O621.25
Type: Master's thesis
Year: 2011
Downloads: 21
Quote: 1
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Abstract


This synthesized a series of 4, 4'-di-substituted benzylidene aniline derivative of nitrogen, its melting point and NMR spectra were measured to determine the structure of the compound was measured in absolute ethanol are ultraviolet absorption spectrum. Studied the substituent effect on the conjugated system 4, 4'-di-substituted benzylidene aniline derivatives nitrogen UV absorption spectra were investigated. Substituted with excited state parameters and their UV spectra associated with the energy of the maximum wavelength, the results showed that: either monosubstituted or disubstituted-change-change, 4, 4'-di-substituted benzylidene aniline derivative nitrogen UV spectrum maximum wavelength energy is substituent can be excited state parameters, polar substituents good correlation parameters; comparative analysis of both polar parameter radicals parameters, and parameters of the excited state of the substituent 4, 4'-di-substituted benzylidene aniline derivative N The correlation result, the excited state that a substituent which parameters can be better correlation maximum wavelength UV energy. Exploration and research of 4, 4'-di-substituted benzylidene aniline derivatives of nitrogen in carbon and nitrogen double bond (C = N) nitrogen atom lone pair of electrons on the molecular structure effects. Synthesis of 26 4, 4'-di-substituted C, N-diphenyl nitrone derivatives found in ethanol UV absorption wavelength relative to the same substituent of a 4, 4'-di-substituted benzylidene aniline nitrogen derivatives occurred redshift. Substituent with the excited state parameters and 4, 4'-di-substituted C, N-diphenyl nitrone derivative UV spectra associated with the energy of the maximum wavelength, the results showed that: either mono-substituted or di-substituted group-change-changes its UV maximum wavelength of the energy spectrum of the excited state parameters can be used to correlate very well. Through 4, 4'-di-substituted benzylidene aniline derivatives of nitrogen and 4, 4'-di-substituted C, N-diphenyl nitrone derivatives of the molecular structure of single-crystal study explored two systems associated with the different forms of equation reasons, as well as ultraviolet wavelength redshift causes. Further expansion of the mutual effect between the substituents on the 4, 4'-di-substituted benzylidene aniline derivatives nitrogen double bond carbon and nitrogen (C = N) of the 13C NMR effects. Proposed new interaction term substituents representation and prove its legitimacy, while the conclusion: Impact carbonitride 13C NMR chemical shifts of the double bond δC (C = N) factors in addition to the inductive effect of substituents and conjugated effect, the interactions between the substituents can not be ignored.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Properties of organic compounds > Chemical properties of organic reactions
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