An evanescent-field-driven self-assembled molecular photoswitch for macrocycle coordination and release.

摘要: Two self-assembled monolayer (SAM) films containing the photoswitchable 4-pyridylazophenoxy chromophore have been deposited onto a gold-coated glass substrate. One film contains as single component, 1 SAM, and other is doped with nonphotoactive component 1:1 mixture, 2 SAM. The reversible photoswitching performances of SAM via evanescence field using light appropriate wavelengths investigated by UV spectroscopic electrochemical monitoring. In principle, trans-form SAMs present coordinating surface, "on" state, that can be switched "off" in cis form. This has illustrated immersing both as-deposited (trans form) photoswitched (predominantly into solutions cobalt zinc tetraphenylporphyrin (CoTPP ZnTPP, respectively) an octaoctyl-substituted phthalocyanine. further phase this study, remote control binding events at surface demonstrated through evanescent-field-driven coordinated surfaces examples these metallomacrocycles. was undertaken constructs immersed neat toluene, macrocycles were released from solvent. release measured monitoring material remaining on constructs. study extended to develop situ release/coordination cycle. Thus, irradiation construct ZnTPP bound waveguided 365 nm releases macrocycle toluene solution ZnTPP. Further now its form, 439 regenerates trans which recoordinates solution. results demonstrate potential for molecular within