Carbon dots (C-dots) represent an emerging class of nontoxic nanoemitters that show excitation wavelength-dependent photoluminescence (PL) with high quantum yield (QY) and minimal photobleaching. The vast majority studies focus on C-dots exhibit the strongest PL emissions in blue/green region spectrum, while longer wavelength are ideal for applications such as bioimaging, photothermal photodyna...

A pyrimidine chromophore bearing an acridan fragment was synthesized and its photophysical properties were studied. In solution, this compound is characterized by important positive emission solvatochromism with a shift of 5800 cm-1 between nonpolar heptane dichloromethane (DCM) associated large Stokes shifts (up to 9100 in DCM). Mono-exponential fluorescence decays are observed whereas more co...

Petrosamine (1)—a colored pyridoacridine alkaloid from the Belizean sponge, Petrosia sp., that is also a potent inhibitor of acetylcholine esterase (AChE)—was investigated by spectroscopic and computational methods. Analysis petrosamine-free energy landscapes, pKa tautomerism, revealed an accurate electronic depiction molecular structure 1 as di-keto form, with net charge q = +1, rather than di...