Synthesis and structure of new 3-pyrazolinylcoumarins and 3-pyrazolinyl-2-quinolones
作者:V. F. Traven、A. V. Manaev、I. V. Voevodina、I. N. Okhrimenko
DOI:10.1007/s11172-008-0195-4
日期:2008.7
The reactions of substituted 3-cinnamoyl-4-hydroxycoumarins and 3-cinnamoyl-4-hydroxy-2-quinolones with different phenylhydrazines gave 3-hetaryl-1H-4,5-dihydropyrazoles. The product structures were studied by 1H NMR spectroscopy and mass spectrometry. 4-Hydroxy-3-pyrazo-linylcoumarins exist in DMSO as two tautomers (4-enol and chromane-2,4-dione), while 4-hydroxy-3-pyrazolinyl-2-quinolones exist only in the enol form.
Functionalized heteroaromatic compounds for nonlinear optical applications
申请人:ENICHEM S.p.A.
公开号:EP0493716A1
公开(公告)日:1992-07-08
Heteroaromatic nonlinear optical compounds, alone, and in combination with a chemically inert medium to provide a combination exhibiting second order nonlinear optical properties, including combinations that dispose a layer of the nonlinear optical compounds on chemically inert substrates, blend guest molecules of the nonlinear optical compounds with a chemically inert host matrix of a thermoplastic polymer, or covalently bond pendant side chains of the nonlinear optical compounds to chemically inert polymers.
3,4-tetrahydroxanthylium heterocyclic system displaying absorption within the near-infrared were synthesized. The photochemical behaviour of these molecules was evaluated in dichloromethane, regarding their ground state absorption properties, fluorescence emission quantum yields and fluorescence lifetimes determinations. The singlet oxygen quantum yields of the new dyes were also obtained. The absorption
Environment-sensitive fluorogens based on a GFP chromophore structural motif
作者:Maxim M. Perfilov、Elvira R. Zaitseva、Alexander Yu Smirnov、Andrey A. Mikhaylov、Nadezhda S. Baleeva、Ivan N. Myasnyanko、Alexander S. Mishin、Mikhail S. Baranov