63989-79-7Relevant articles and documents
Synthesis, structure, spectroscopic properties, electrochemistry, and DFT correlative studies of N-[(2-pyridyl)methyliden]-6-coumarin complexes of Cu(I) and Ag(I)
Roy, Suman,Mondal, Tapan Kumar,Mitra, Partha,Torres, Elena Lopez,Sinha, Chittaranjan
, p. 913 - 922 (2011/05/04)
6-Aminocoumarin reacts with pyridine-2-carboxaldehyde and has synthesized N-[(2-pyridyl)methyliden]-6-coumarin (L). The ligand, L, reacts with [Cu(MeCN)4]ClO4/AgNO3 to synthesize Cu(I) and Ag(I) complexes of formulae, [Cu(L)2]ClO4 and [Ag(L) 2]NO3, respectively. While similar reaction in the presence of PPh3 has isolated [Cu(L)(PPh3) 2]ClO4 and [Ag(L)(PPh3)2]NO 3. All these compounds are characterized by FTIR, UV-Vis and 1H NMR spectroscopic data. In case of [Cu(L)(PPh3) 2]ClO4 and [Ag(L)(PPh3)2]NO 3, the structures have been confirmed by X-ray crystallography. The structure of the complexes are distorted tetrahedral in which L coordinates in a N,N′ bidentate fashion and other two coordination sites are occupied by PPh3. The ligand and the complexes are fluorescent and the fluorescence quantum yields of [Cu(L)(PPh3)2]ClO 4 and [Ag(L)(PPh3)2]NO3 are higher than [Cu(L)2]ClO4 and [Ag(L)2]NO3. Cu(I) complexes show Cu(II)/Cu(I) quasireversible redox couple while Ag(I) complexes exhibit deposition of Ag(0) on the electrode surface during cyclic voltammetric experiments. gaussian 03 computations of representative complexes have been used to determine the composition and energy of molecular levels. An attempt has been made to explain solution spectra and redox properties of the complexes.
6-amino-1,2-benzopyrones useful for treatment of viral diseases
-
, (2008/06/13)
Unsubstituted or substituted 6-amino-1,2-benzopyrones are potent, selective and non-toxic inhibitors and suppressants of viral infections in a mammalian host. The compounds are particularly useful for treatment of AIDS, herpetic episodes and cytomegaloviral infections. The method of treatment of viral diseases by 6-amino-1,2-benzopyrones is described.