Ordering processes in chiral and racemic monolayers of three phenylalanyl-substituted ω-thiol alkanoic acids on gold have been investigated with the use of infrared reflection absorption spectroscopy. For chiral molecules, packing is influenced by both hydrogen-bonding interactions between the end groups at the air/monolayer interface and the length of the spacer chain within the monolayer. Results for a mixed monolayer of octadecylmercaptane and phenylalanyl-substituted ω-thiol docosanoic acid indicate that formation of large islands of either one of the compounds can be excluded. For a racemic monolayer of phenylalanyl-substituted ω-thiol undecanoic acid, a dense, yet unregular, packing is observed.
利用红外反射吸收光谱技术,研究了三种苯丙氨酰取代的ω-硫醇烷酸在金表面手性和非手性单层中的排序过程。对于手性分子,包装受到空气/单层界面末端基团之间的氢键作用和单层内间隔链的长度的影响。八十二十硫醇和苯丙氨酰取代的ω-硫醇二十二烷酸混合单层的结果表明,可以排除任何一种化合物形成大岛的可能性。对于苯丙氨酰取代的ω-硫醇十一烷酸的非手性单层,观察到了密集但不规则的包装。