Errata - Sites and Thermodynamic Quantities Associated with Proton and Metal Ion Interaction with RIbonucleic Acid, Deoxyribonucleic Acid, and their Constituent Bases, Nucleosides,and Nucleotides.

Synthesis, characterization and spectroscopic properties of some new phenylazo-6-aminouracil

“…For this purpose, the absorption spectra of phenylazo-6-aminouracil dyes (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) were measured in various solvents at a concentration of approximately 10 -6 -10 -8 M and were run at different concentrations. The dyes were not fully dissolved, and any insoluble material in all solvents was filtered off.…”

“…The pyrimidine nucleus was the key feature of various drugs. Pyrimidine dyes are used as hypnotic drugs for the nervous system [1], in detecting cancer, as chemotherapeutic agents, and are involved in the structure of nucleic acids in living cells [2]. In addition, some pyrimidine derivatives have biological and pharmacological activities [3][4][5][6].…”

A study on tautomeric investigation of new hetarylazo-6-aminouracil

“…Generally, most of the substituted dyes have higher absorption maxima than their unsubstituted analogs. In the present study, spectral data for the various substituted hetarylazouracil dyes (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) show that there is a general tendency for the visible absorption band to move bathochromically in accordance with the electron donor-acceptor groups in the diazo and coupling component. These involve a migration of electron density from the donor group toward the azo group.…”

“…The absorption spectra of hetaryl-azouracil dyes (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) were measured in various solvents at a concentration approximately 10 -6 -10 -8 M, run at different concentrations because of solubility problems ( Table 1). All the dyes have low solubility in chloroform which is the least polar solvent I used, and the absorption spectrum was only recorded in chloroform for dye 12.…”

“…2 Some pyrimidine derivatives have biological and pharmacological activities. [3][4][5][6] Uracils are a very important class of pyrimidine derivatives, that continually attract organic chemists, medicinal chemists and photobiologists.…”