Studies on solvatochromic behavior of some monoazo derivatives using electronic absorption spectra

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

“…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.…”

Solvent, substituents and pH effects towards the spectral shifts of some highly colored indicators

“…Bands observed at longer wavelength (e.g., at 500 nm in EBT) is attributed to the weak forbidden n-π* transitions. 20 It was observed that the main bands of the compounds (SO and AYR) which are located in the range of 310--550 nm exhibit an apparent shift towards longer wavelengths in different solvents according to the sequence: 1,4-dioxane < acetone < acetonitrile < EtOH < DMSO < H 2 O. This shift is in agreement with the change in the polarity of the organic solvents and could be considered as a result of the combination of the several solvent characteristics such as polarity and hydrogen bonding.…”