RESUMO
This paper demonstrates the basic character (polarity, solubility, colour, absorption and fluorescence quantum yield) of synthetic dimethylaminochalcone (1) and its cyclic analogues measured in toluene, chloroform, dimethylsulfoxide and ethanol, which have been studied by absorption and fluorescence spectroscopy. The biologically active dye 4'-dimethylaminochalcone (1b) and its less flexible analogues 4-dimethylaminoindanone (2b), -tetralone (3b), and -benzosuberone (4b) are lipophilic molecules that displayed the best solubility in toluene and chloroform. The highest fluorescence and quantum yields of compounds 1 and 2 have been obtained in DMSO and chloroform. Quenching effect of fluorescence compounds (1-4) has been studied in the mixture of the most polar organic solvents DMSO and water. In the presence of water, fluorescence of compound 1 has been quenched the best from all studied chalcones and emission maxima of molecules 1-4 have been shifted to the longer wavelengths. Quenching effect of fluorescence by water was in order 1 > 2 > 3 > 4.
Assuntos
Chalconas/química , Absorção , Dimetil Sulfóxido/química , Espectrometria de Fluorescência , Água/químicaRESUMO
The synthesis of novel 1',1''-(acridin-3,6-diyl)-3',3''-dialkyldiureas was reported. Their biological activity to inhibit cell proliferation was assessed by a MTT assay on two cell lines, HeLa and HCT-116, at micromolar concentration. 1',1''-(Acridin-3,6-diyl)-3',3''-dihexyldiurea hydrochloride was active on a HCT-116 cell line with an IC(50) value of 3.1 microM. The interaction of these compounds with calf thymus DNA was investigated by a variety of spectroscopic techniques including UV-vis, fluorescence and CD spectroscopy. From spectrofluorimetric titrations, binding constants for the DNA-drug complexes were determined (K=0.9-4.2x10(5) M(-1)). Antiproliferative activity of synthesized derivatives might be related to their intercalation into DNA.
