Solvent Effect on the Absorption and Fluorescence Emission Spectra of Some Purine Derivatives: Spectrofluorometric Quantitative Studies

Towards a Molecular Understanding of Cation‐Anion Interactions and Self‐aggregation of Adeninate Salts in DMSO by NMR and UV Spectroscopy and Crystallography

“…Conversely, the solvation of the adeninate anion by polar solvents stabilizes the π* orbital, resulting in a redshift of the λ max with increasing polarity and hydrogen‐acceptor properties of the solvent. [42] A M‐Ade concentration dependent redshift is observed in DMSO/H 2 O, having the Na‐Ade shift from 262 to 265 nm and K‐Ade shift from 264 to 269 nm, accompanied by the increase in shoulder band intensity at 278 and 287 nm, which are attributed to the presence of the cationic and anionic species. [42] These shoulder bands decrease in intensity as the concentration of Na‐ and K‐Ade decreases as the presence of water molecules assists the dissociation of ion‐pairs.…”

“… [42] A M‐Ade concentration dependent redshift is observed in DMSO/H 2 O, having the Na‐Ade shift from 262 to 265 nm and K‐Ade shift from 264 to 269 nm, accompanied by the increase in shoulder band intensity at 278 and 287 nm, which are attributed to the presence of the cationic and anionic species. [42] These shoulder bands decrease in intensity as the concentration of Na‐ and K‐Ade decreases as the presence of water molecules assists the dissociation of ion‐pairs. In DMSO, the concentration‐dependent redshift of the band around 265 nm for Na‐ and K‐Ade is absent and the band intensity at 278 and 287 nm is larger in magnitude than in DMSO/H 2 O, indicating the ion‐pairs are the predominate species.…”

A platform for high-throughput screening of DNA-encoded catalyst libraries in organic solvents

“…Importantly, PEG 40 000 enabled solubility in a range of organic solvents, while maintaining excellent solubility in water. Since nucleobase absorbance can be influenced by solvent effects, 31 and due to some organic solvents overlapping with the UV absorbance of DNA, we independently quantified solubility using qPCR (Fig. S2†).…”

Solvatochromism Effect Studies on Electronic Absorption Spectral of Some Hydroxy Tolyl Azo Benzaldehyde dyes.

“…Azo I: λ max = 292 nm) to polar solvent H 2 O (λ max = 300nm)). This shift is mainly due to solutesolvent interactions that cause stabilization of the π* orbital more than the π orbital in polar solvents (24) . All compounds possess an azo group conjugated to two arenes.…”