摘要:

Spectral properties of some 2-Quinolones were investigate-ed. IR and1H NMR were applied to characterize the ligands. The hydrogen bond property is of important parameter for controlling the behaviour of the compounds. The N‒H, O‒H, C˭O, C‒H, and C‒N fundamental functional groups are characterized. The electronic transitions are assigned. The data are explained on the basis of molecular structure and substituents effects. The acid-base equilibria and the phenomena of tautomerism for these compounds are explained and discussed. The acid exponents (pKOH, and pKNH) are evaluated.

ISSN:0038-7010    

DOI:10.1080/00387018808062719

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Protonation and complexation of nucleic acid bases with metal ions have a profound influence on their structure and reactivity.1–3Although the interaction between carbony bases and the Li+ion has been studied by vibrational spectroscopy and ab initio calculations8–15, no experimental results are available for the complexation between this ion and carbonyl bases derived from nucleic acids. In this work, the interaction between 1,3-dimethyluracil (DMU)

ISSN:0038-7010    

DOI:10.1080/00387018808062720

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Hydration of Zn (II), Mn(II), and Mg(II) perchlorates has been studied by IR and near-IR spectroscopy, Salt-affected water spectra as well as the number of salt-affected water molecules have been determined and discussed in terms of ion hydration with relation to salt concentrations.

ISSN:0038-7010    

DOI:10.1080/00387018808062721

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Novel and simple technique suitable for spectroscopic studies of liquid samples is being described. Its validity has been experimentally verified using water as the specimen.

ISSN:0038-7010    

DOI:10.1080/00387018808062722

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The complexation of equimolar mixture of two biopolymers DNA and RNA bycis-platinum at rb−0.1 leads to 20% preferential binding to DNA as established by Electron Impact Pyrolytical Mass Spectrometry.

ISSN:0038-7010    

DOI:10.1080/00387018808062723

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The CIDEP characteristics of radicals derived from tetra-fluoro-p-benzoquinone have been studied. An alternating linewidth effect in the time-resolved CIDEP spectra was observed when a hydroxylic/non hydroxylic solvent mixture was used. The results are discussed in terms of chemical exchange between the neutral and anionic quinone radicals.

ISSN:0038-7010    

DOI:10.1080/00387018808062724

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Infrared and Raman spectra were obtained for 3-methylbutyronitrile and were interpreted with the aid of normal coordinate calculations. The presence of both possible conformers was verified in this way. Molecular mechanics calculations were made for both conformers, and structural and energy data were obtained.

ISSN:0038-7010    

DOI:10.1080/00387018808062725

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The PMR tuchnique was applied to the quantitative analysis of some drugs, fenfluramine HCl, diethylpropion HCl, methyldopa and 2-acetoxy-4-trifluoromethyiberroic acid in pharmaceutical forms.

ISSN:0038-7010    

DOI:10.1080/00387018808062726

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Analysis of the circular dichroism spectra of bilirubin-IXα amides ofS'-(-)-1 -phenylpropylamine reveals a preference in organic solvents for folded, intramolecularly H-bonded conformations involving the amide N-H hydrogen.

ISSN:0038-7010    

DOI:10.1080/00387018808062727

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The electronic absorption spectra of 2-nitrophenol, salicylic acid, 2-aEinophenol, catechol, pyrogallol and gallic acid, have been measured in different solvents. The solvent effects on the spectra have been discussed and the solvent Induced spectral shifts have been analysed as a function of different solvent polarity parameters. Moleculer orbital calculations of the different singlet-singlet and triplet-triplet transitions in these systems have been done using the PPP method.

ISSN:0038-7010    

DOI:10.1080/00387018808062728

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor