New 3-(Heteroaryl)-2-iminocoumarin-based Borate Complexes: Synthesis, Photophysical Properties, and Rational Functionalization for Biosensing/Biolabeling Applications
3‐(heteroaryl)‐2‐iminocoumarin ligands bearing both a phenolic hydroxyl group (acting as a fluorogenic center) and an N‐aryl substituent (acting as a stabilizing moiety) have been synthesized in good yields by applying a straightforward two‐step method. These novel fluorogenic dyes belong to the family of “Boricos” (D. Frath et al., Chem. Commun. 2013, 49, 4908–4910) and are the first examples of phenol‐based fluorophores
作者:A. A. Karasev、L. L. Lukatskaya、M. I. Rubtsov、Z. A. Sizova、A. O. Doroshenko
DOI:10.1023/a:1021616027620
日期:——
3-(Benzoimidazol-2-yl)-2-phenylimino-2H-chromenes were synthesized. The protolytic equilibrium constants in 50% ethanol were determined. The correlations of the pK(a) values for the compounds in the ground and excited states and the PM3-calculated heats of formation with the sigma(+) constants of substituents were established. The nitrogen atom of the benzoimidazole fragment is the center of protonation in the studied compounds.