Resonance Energy Transfer (RET) is investigated in pairs of charge-transfer (CT) chromophores. CT chromophores are an interesting class of π conjugated chromophores decorated with one or more electron-donor and acceptor groups in polar (D-π-A), quadrupolar (D-π-A-π-D or A-π-D-π-A) or octupolar (D(-π-A)(3) or A(-π-D)(3)) structures. Essential-state models accurately describe low-energy linear an...

Abstract A continuous-flow process is presented that enables the safe generation and derivatization of benzyne under photochemical conditions. This facilitated by a new high-power LED lamp emitting light at 365 nm. The resulting flow effectively controls release gaseous by-products based on an adjustable backpressure regulator delivers series heterocyclic products in short residence time 3 minu...

Although second harmonic generation (SHG) microscopy provides unique imaging advantages for voltage imaging and other biological applications, genetically-encoded SHG chromophores remain relatively unexplored. SHG only arises from non-centrosymmetric media, so an anisotropic arrangement of chromophores is essential to provide strong SHG signals. Here, inspired by the mechanism by which K-Ras4B ...

The aim of the present work is to demonstrate that combined spatial tuning of fluorescence and two-photon absorption (TPA) properties of multipolar chromophores can be achieved by introduction of slight electronic chemical dissymmetry. In that perspective, two model series of structurally related chromophores have been designed and investigated. One is based on rod-like quadrupolar chromophores...

Novel chromophores based on the alternation of electron-poor (pyridyl) and electron-rich (ethylenedioxythienyl) heterocycles were synthesized for the first time and shown to exhibit attractive optical properties in relation with their specific electronic and geometrical (coiled structure) features.

We report in this contribution the first photochemical study of benzene trapped solid nitrogen at low temperature (16 K) and irradiated with a mercury lamp (λ > 230 nm). identify three isomers (fulvene, Dewar benzvalene) two radicals (phenyl benzyne) as photo-dissociation products, along acetylene derivatives substituted benzene. present for time infrared spectrum fulvene ice, which is obtained...

The present study (see ref 1) delineates the scope and limitations of porphyrin chromophores for structural studies by the exciton coupled circular dichroic (CD) method. A distance dependency of the porphyrin coupling was investigated in the range between 10 and 50 Å. Over short interchromophoric distances, significant changes in the conformational distribution introduced by the bulky porphyrin...

Several proposals to construct artificial photoresponsive polymer systems have been described. chromophores in the backbone reversibly changed the conformation by ultraviolet light irradiation(410 > > 350 nm), which causes the trans to cis isomerization of the chromophores. Aqueous solutions of poly(N-isopropylacrylamide) with pendant azobenzene chromophores showed a photostimulated phase separ...