Spectroscopic properties of amino-analogs of luciferin and oxyluciferin were investigated to confirm the color modulation mechanism of firefly (beetle) bioluminescence. Fluorescence solvatochromic character of aminooxyluciferin analogs indicates that the bioluminescence of aminoluciferin is useful for evaluating the polarity of a luciferase active site.

BACKGROUND For the development of properties in molecular crystals, such as electrical conductivities, magnetic properties, or non-linear optical properties, not only the electronic properties of molecules themselves matter, but also the molecular arrangements in the crystals are very important. Therefore, the design of the crystal structures and the control of molecular arrangements have attra...

The excited-state dynamics of two donor-acceptor biaryls that differ by the strength of the acceptor, a pyridinium or a pyrylium moiety, have been investigated using a combination of steady-state solvatochromic absorption, ultrafast fluorescence, as well as visible and infrared transient absorption spectroscopies. The negative solvatochromic behavior of pyridinium phenolate indicates that the p...

Optical absorption and fluorescence emission spectral studies of acridine in different solvents namely, carbon tetrachloride, dichloromethane, propan-2-ol, ethanol, methanol, acetonitrile, and N,Ndimenthyl formamide have been investigated. Oscillator strength and transition dipole moment of the acridine have been elucidated from the optical absorption measurement. The ratio of the excited state...

The effects of solution-state dielectric and intermolecular interactions on the degree charge separation provide a route to understanding switching properties concentration dependence donor–acceptor Stenhouse adducts (DASAs). Through solvatochromic analysis open-form DASA in conjunction with X-ray diffraction computational theory, we have analyzed ionic character series DASAs. First- third-gene...

A reversible and pH-independent fluorescent ion optode is introduced with an ionophore and surface confined solvatochromic dye transducer doped onto microporous nylon membranes. The resulting film responds to K+ with excellent selectivity over the range of 10-7 to 10-2 M and a response time of t95 < 60 s above 10-6 M.

the solvatochromism of fluoresceine and its derivatives was studied in solvents of different hydrogen bond donor (hbd), hydrogen bond acceptor (hba), donor number (dn) and acceptor number (an) by their uv-vis spectra. results showed that position, intensity and shape of absorption bands change with type of solvent. these changes can be rationalized by solvatochromic parameters such as α, β, et ...

The Cover Feature illustrates how photoswitchable solvatochromic fluorophores can be used to distinguish lipid membrane domains with different ordering using super-resolution microscopy. More ordered membranes have lower water content than disordered so by detecting fluorescence in multiple spectral regions, the parts of mapped. design Kathryn G. Leslie. information found Research Article Andre...