Solvatochromic effect studies on the absorption spectra of 4-((2-ethylphenyl)diazenyl)benzene-1,3-diol and 2-((2-ethylphenyl)diazenyl)benzene-1,3,5-triol molecules

DNA and BSA binding, anticancer and antimicrobial properties of Co(ii), Co(ii/iii), Cu(ii) and Ag(i) complexes of arylhydrazones of barbituric acid

“…The wavelength (l max ) and molar absorption values (3) of all free ligands, their metal complexes and cocrystals in the UVvis region 220-600 nm are reported in Table 4S (ESI †). In the spectra of H 4 L 1 and H 3 L 2 the bands at 262-266 nm are due to pp* electronic transition in C]O, while the bands at 388-414 nm are mainly of n-p* type in N]N. [24][25][26] Similarly the sodium complex 1 shows analogous features, even if the band at the lower wavelength seems splitted into two very close absorptions.…”

An experimental study on relationship between hammett substituent constant and electronic absorption wavelength of some azo dyes

“…As expected in non-polar solvents benzene and CCl4, azo dyes show three electronic absorption bands. These bands are due to the conjugation between the azo bridge and aromatic rings, the lone-pair located on the azo bridge and hydroxyl (OH) groups and intramolecular O-H…N hydrogen bond formation, respectively (Issa et al 1972;Gülseven et al 2009;Gülseven et al 2011a;Gülseven et al 2011b). According to Table 2, the induction of electrons in substituents (OH, OCH3, C2H5) of benzene ring produce bathochromic shifts on the band wavelength absorption maximum as compared to that of Az1 in solvents.…”

“…Investigated azo dyes show mostly bathochromic effect. When azo dyes have electron donor properties, it brings about bathochromic effect due to increasing conjugation and so photosensitization (Gülseven et al 2009;Sıdır et al 2009;Gülseven Sıdır et al 2011ab).…”

“…In our previous works, absorption spectra of azo dyes in different solvents were examined with linear solvation energy relationship using refractive index functions, dielectric functions and Kamlet-Taft parameters (Issa et al 1972;Gülseven et al 2009;Sıdır et al 2009;Gülseven Sıdır et al 2011ab). In this present work, ultraviolet absorption spectra of 16 azo dyes have been recorded in the region of 200-600 nm in different solvents.…”

Solvatochromic Effect Studies on the Stability of Dioxovanadium(V) Complexes with Ethylene Glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic Acid in Different Water + Methanol Mixtures

“…Although several multiparameter equations have been proposed, the KAT equation seems to be the most widely applied multiparameter approach. A literature survey reveals that in spite of several papers about application of the KAT equation [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] there are no reports on the complexation of dioxovanadium(V) with ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid (EGTA) in different aqueous solutions of methanol by using the KAT equation. The present study deals with the aforementioned system to investigate the contribution of the KAT parameters.…”