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4-Dinitrophenol Lab Report

602 Words3 Pages

This paper talks about what effect the reaction speed when 2,4-dinitrophenol (24-DNP) is going to be decomposed by nature light. In an aqueous environment, decomposition speed of 24-DNP is significantly slower than which dissolved in secondary organic material (SOM) which generated through a-pinene. Low temperature also do great effect to this reaction in organic solvent. Author make a assumption that the increase of viscosity,due to low temperature, suppresses the moment of atom reaction.The temperature, the matrix structure and the viscosity are first time be reported. The result will increasing the research of reaction between 24-DNP and nitro-aromatic modular and the research of their effect on environment.
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Secondly, the difference in photochemical rates in different organic media. The mechanism of photochemical reaction shows that the matrix is key point.Same matrix will result in same reaction product. But the effect of temperature in different system is different. In octanol the temperature do little effect. But in SOM the temperature effects is obvious. Even their matrix is like the same. The author assuming that because DNP cannot easily abstract a hydrogen atom from surrounding SOM because it loses its energy in low temperature.
And the viscosity changes and the function of temperature is connecting. Viscosity will effects the activation energy which will effects the reaction rate. In SOM the viscosity is lower so the reaction rate is significantly higher. In low temperature the viscosity of
SOM ’s increase directly effect the photochemistry of DNP speed and make it decrease significant fast.
The research in this area proofs that the photochemistry is concerning viscosity and will decrease in high viscosity material. And it makes an assumption about the mechanism of photochemistry in atmosphere. Glassily and high viscosity areo-gel particle

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