【摘要】 考察了溶剂介电常数对肉桂醛、肉桂酸的紫外最大吸收波长λmax的影响,测定了肉桂醛、苯甲醛和苯乙酮在乙醇—水混合溶剂中的λmax,研究了肉桂酸在甲醇—水和甲醇—乙醇、肉桂醛在乙腈—水中的紫外吸收变化规律。结果表明,溶剂对肉桂醛及其衍生物的λmax有显著影响。肉桂醛、肉桂酸、苯甲醛和苯乙酮的λmax值与两种混合溶剂的介电常数ε值有良好线性关系。更多还原

【Abstract】 In the present paper the effects of dielectric constant on the UV absorption maximum wavelength(λmax) of cinnamaldehyde and cinnamic acid was investiqated,the λmax of cinnamaldehyde,benzaldehyde and acetophenone in ethanol-water and UV absorption of cinnamic acid in methanol-water and methanol-ethanol,cinnamaldehyde in acetonitrile-water were measured.The results indicated that the solvent had significant effect on the λmax of cinnamaldehyde and its derivatives.The λmax of cinnamaldehyde,cinnamic acid,benzaldehyde and acetophenone had a good linear relationship with dielectric constan of the mixed solvent.更多还原