NIR Responding Chromophores
A precise control of the optical properties within detaily defined chromophore can be achieved by several factors. We have documented that the regiospecifically modified tetraphyrin(18.104.22.168) skeleton responds efficiently to fundamental inititors (protonation/deprotonation) changing both absorption and emission that eventually can be observed at about 800 nm. In addition the redox process performed on the same molecule causes efficient switching off the fluorescence.
See: Chem. Asian J. 2016, 11, 3329-3333; Chem. Commun. 2015, 51, 11362-11365.
Redox Switchable Chromophores
Aromatic and antiaromatic molecules play pivotal roles in many applications. Both electronic states are characterised by completely different spectroscopic behaviour what bring a consequence to optical properties. We conduct a research task that forms and characterise structures where both electronic states are interchangable by a redox process.
See: Angew. Chem. Int. Ed. 2015, 54, 1906-1909; Angew. Chem. Int. Ed. 2014 53, 2992-2995.
Tripyrranes, structures where three heterocyclic units are linked by two methylene bridges present interesting properties starting from coordination abilities but also optical properties have been recorded as intriguing response. During our work we have explored several examples with increased rigidity of triheterocyclic brace linked with a carbon chain of different length.