Abstract
Sixteen new bisurea compounds incorporating versatile proteinogenic amino acids as well as nipecotic acid have been synthesized via addition reaction to aryl diisocyanates. The products were analytically characterized and their ability for anion recognition was studied by UV/Vis spectroscopy. In the presence of fluoride, acetate or dihydrogenphosphate ions, hyperchromic and bathochromic peak shifts were determined. By way of contrast, bromide, iodide, or hydrogensulfate ions cause no significant change of absorbance. The special effect of heterocyclic derivatives was explained by molecular modeling calculations. In addition, the crystal structure of the byproduct dimethyl N,N′-(1,4-phenylene)dicarbamate is discussed.
摘要:已合成十六种新的双脲化合物,其中包含多功能蛋白质原料氨基酸以及尼佩考酸,通过加成反应与芳香族二异氰酸酯发生反应。对产物进行了分析表征,并通过紫外/可见光谱研究了它们对阴离子识别的能力。在氟化物、乙酸盐或二氢磷酸盐存在下,确定了超色素和巴托色素峰位移。相比之下,溴化物、碘化物或硫酸氢盐离子不引起吸光度的显著变化。异环衍生物的特殊效应通过分子建模计算进行了解释。此外,讨论了副产物二甲基N,N′-(1,4-苯基)二氨基甲酸酯的晶体结构。