Molecular fluorescent signalling with ‘fluor–spacer–receptor’ systems: approaches to sensing and switching devices via supramolecular photophysics

Modification of Fluorescent Photoinduced Electron Transfer (PET) Sensors/Switches To Produce Molecular Photo‐Ionic Triode Action

“…This is as expected for fluorescent PET sensors and switches carrying fluorophores with pp* excited states, [25,34] since only f F is pH-dependent and since the pK a value of the excited state is essentially identical to that of the ground state in these cases. The latter feature contributes to the operational simplicity of fluorescent PET systems compared with other sensing approaches based on fluorescence.…”

“…Some of these molecular systems have unique applications which are inconvenient for their electronic counterparts, such as wireless operation in micrometric spaces. [16] The first molecular logic gate [17][18][19][20][21][22][23] 1 (an advanced molecular switch [24] ) was a fluorophore-spacer 1 -receptor 1 -spacer 2 -receptor 2 system, [25,26] where two photoinduced electron transfer (PET) [4, 27] channels arising from the two receptors were controlled by binding H + and Na + ions, respectively, and thus the fluorescence output corresponded to photo-ionic AND logic. Strong fluorescence emerges only when all PET processes are suppressed (Figure 1 a).…”

Taking baby steps in molecular logic-based computation

“…When the receptor captured the target species, the oxidation potential is raised, to the point that PET is 75 not possible so that we have fluorescence resurrection. This photoelectro-chemical mechanism shows the modular behaviour 52,53 of the 'fluorophore-spacer-receptor' system, which is molecular engineering in action. It is gratifying that such a design tool with several quantitative features 52,53 has been taken 80 up by around 300 laboratories.…”

“…This photoelectro-chemical mechanism shows the modular behaviour 52,53 of the 'fluorophore-spacer-receptor' system, which is molecular engineering in action. It is gratifying that such a design tool with several quantitative features 52,53 has been taken 80 up by around 300 laboratories. 2 A snapshot of the developments of this tool during the past year or two is contained in a recent review.…”

Dendronized Polymers with Ureidopyrimidinone Groups: An Efficient Strategy To Tailor Intermolecular Interactions, Rheology, and Fracture

“…[1][2][3] The versatility of their properties, which can vary from solid-like (for example, gels) to liquid-like, gives them a central role in several technological advances, including self-healing 4 and reinforced materials [5][6][7] , sensors 8,9 , cosmetics 10 , and drug delivery. 11,12 Despite the large body of literature on the dynamics of transient networks from associating polymers, tailoring the molecular features of polymers in order to achieve optimal properties, e.g.…”