24922-39-2Relevant academic research and scientific papers
Schiff bases derived from 6-amino-2H-chromen-2-one. Synthesis and 1H NMR spectra
Ganushchak,Kobrin,Bilaya,Mizyuk
, p. 1064 - 1070 (2005)
A number of 6-arylmethylideneamino-2H-chromen-2-ones were synthesized by reaction of 6-amino-2H-chromen-2-one with aromatic and heterocyclic aldehydes. A linear relation was revealed between the chemical shifts of the azomethine CH=N proton and protons in
Intramolecular charge transfer in coumarin based donor-acceptor systems: Formation of a new product through planar intermediate
Phukan, Smritakshi,Saha, Mithu,Pal, Amarta Kumar,Bhasikuttan,Mitra, Sivaprasad
, p. 67 - 79 (2015/08/26)
Fluorescence behavior and intramolecular charge transfer (ICT) property of N,N′-dimethylamino substituted anil derivative of coumarinyl amine was studied by steady state and time-resolved fluorescence spectroscopy in combination with density functional theory calculation. Quantitative analysis of the effect of solvent hydrogen bonding on several spectral parameters was done using multiple regression analysis based on Kamlet-Taft model. The present system shows an additional long wavelength fluorescence band almost instantaneously in presence of methanol in sharp contrast to the model unsubstituted analogue. This new fluorescence band is believed to be due to the formation of a new isomer (cis-type) through a planar intermediate. While there is a substantial barrier (～50 kJ mol-1) in the ground state, the isomerization process in the excited state in polar-protic environment proceeds very fast and believed to be catalyzed by hydrogen bond formation at the imine nitrogen atom in combination with stabilization of the resulting species through ICT.
