A novel cationic, photoresponsive azobenzene derivative with the characteristic of self-assembly, 2-4-[(E)-(4-[11-(dodecylthio)undecyl]oxy}phenyl)diazenyl]phenoxy}-N,N,N-trimethylethanaminium bromide (1), has been synthesized. Self-assembled monolayers (SAMs) of 1 on ultrathin, transparent platinum electrodes have been fabricated and the reversible trans â cis interconversion has been demonstrated by absorption spectroscopy in transmission mode and contact angle measurements. It is shown that such photoresponsive SAMs promote the binding of anionic porphyrins at the metal surface and trigger their release upon light excitation exploiting the different light-controlled electrostatic interactions with the two isomeric forms of 1.
                                    一种具有自组装特性的新型阳离子光致伸缩
偶氮苯衍
生物--2-4-[(E)-(4-[11-(
十二烷硫基)
十一烷基]氧基}苯基)偶氮]苯氧基}-N,N,N-三甲基
溴化乙
铵(1)被合成出来。在超薄透明的
铂电极上制作了 1 的自组装单层(S
AMs),并通过透射模式吸收光谱和接触角测量证明了反式-顺式的可逆相互转化。研究表明,这种具有光致伸缩性的 S
AMs 能促进阴离子
卟啉在
金属表面的结合,并利用光控制下与 1 的两种异构体之间不同的静电作用,在光激发时引发
卟啉的释放。