Of a series of 4-substituted 1,8-naphthalimides, fluorescent 4-(6-piperidinyl-1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl)benzoic acid (4) was found to be a sensitive molecular probe for ZnO nanoparticles. We investigated in detail one- and two-photon absorption properties of this fluorophore. In nonpolar solvents, the acid 4 absorbs at about 400 nm and fluoresces at 500 nm with a fluorescence l...

Aclacinomycin A was observed to effect the thermal denaturation of DNA and to increase Tm. The visible absorption spectrum of the antibiotic showed bathochromic and hypochromic shifts upon reaction with native and heat-denatured DNA. [14C]Aclacinomycin A was demonstrated by equilibrium dialysis to bind to DNA. Native calf thymus DNA appeared to possess one binding site per ca. 6 nucleotides for...

New derivatives of 3,3′-di-((( E )-(5-substituted-thiophen-2-yl)methylene)amino)- N -methylpropylamines ( 3a,b ) were synthesized from the dehydration -methyl-diaminopropylamine and 2-thielylcarboxaldehyde derivatives; spectroscopically characterized by 1 H- 13 C-NMR, IR, LC-MS, UV-Vis elemental analysis. The nature electronic transitions SB compounds was investigated using Time-Dependent Densi...

A novel donor-?-acceptor fluorescent dye as a chemosensor for Cu2+ ions is herein presented. The fluorophoric core consists of 3,5-diphenyl-dicyanomethylene-4H-pyran (DCM), with extended styryl chains on positions 2 and 6, bearing terminal di-(2-picolyl)amine (DPA) groups metal coordination. Optical characterization the reveals an absorption maximum at ca. 500 nm strong bathochromic shift in em...

The synthesis of the new diethyl ammonium salt of diethylammonium(E)-5-(1,5-bis(4-fluorophenyl)-3-oxopent-4-en-1-yl)-1,3-diethyl-4,6-dioxo-2-thioxohexaydropyrimidin-5-ide 3 via a regioselective Michael addition of N,N-diethylthiobarbituric acid 1 to dienone 2 is described. In 3, the carboanion of the thiobarbituric moiety is stabilized by the strong intramolecular electron delocalization with t...

The effect of solvents of varying polarity on the absorption and fluorescence emission of the Schiff base, 2-{[3-(1H-benzimidazole-2-yl) phenyl]carbonoimidoyl}phenol, was studied using Lippert-Mataga bulk polarity function, Reichardt's microscopic solvent polarity parameter and Kamlet's multiple linear regression approach. The spectral properties follow Reichardt's microscopic solvent polarity ...

The binding of bromosulphthalein to human and bovine Serum albumin was studied by infrared spectroscopy, laser-Raman spectroscopy, visible spectroscopy and pH measurements in order to obtain information on the binding forces involved. No conformational change of the proteins was observed during the tight binding of the first three bromosulphthalein molecules as indicated by the kinetics of the ...

Three sensitive, selective, rapid and easily reproducible spectrophotometric methods (A-C) have been developed for the determination of propranolol hydrochloride (PPH) as a hydrochloride free base propranolol (PPL) in bulk sample and in its dosage forms. These methods are based on ion-pair formation between propranolol as a hydrochloride and free base and three acidic (sulphonphthalein) dyes; n...

A new mononuclear Pt(II) complex, [Pt(DMP)(DIP)]Cl(2).H(2)O, in which DMP is 4,4-dimethyl-2,2-bipyridine and DIP is 4,7-diphenyl-1,10-phenantroline, has been synthesized and characterized by physicochemical and spectroscopic methods. The binding interaction of this complex with calf thymus DNA (CT-DNA) was investigated using fluorimetry, spectrophotometry, circular dichroism, viscosimetry and c...

Article history: Received on: 02/03/2013 Revised on: 29/03/2013 Accepted on: 15/04/2013 Available online: 12/05/2013 This study is an investigation of the physicochemical interaction of Losartan potassium (LST K), an angiotensinII receptor (type AT1) antagonist, with micelles of triton X, a nonionic surfactant. The effect of micelles on the spectral properties of LSTK was monitored on at pH 7.4...