摘要:

A method of investigating hydration of a solute (beginning with infinite dilution) with the use of vibrational spectra has been presented. The procedure has been applied to aqueous Ca(C104)2solution spectra of OD(HDO) fundamental stretching vibration and combination vibrations of H2O (1100 – 1300 nm). The number of Ca(c104)2-affected water molecules has been determined; the obtained hydration spectra reveal anion-affected and cation-affected water bands.

ISSN:0038-7010    

DOI:10.1080/00387018808082314

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A complete set of unambiguous1H and13C NMR assignments of Acridine in CDCl3has been made using nuclear overhauser (NOE) experiments and 2D NMR techniques. The usefulness of 20 Heteronuclear technique using long range (13C−1H) couplings leading to proper assignment of the two quaternary carbons in the molecule is also highlighted. Accurate (1H−1H) coupling constants obtained after a spectral simulation are presented. Several13C−1H couplings and 1-bond13C−13C couplings are also reported.

ISSN:0038-7010    

DOI:10.1080/00387018808082315

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A simple and rapid spectrophotometrie method for the quantitative determination of thioxanthene derivatives; chlorprothixene, thiothixene and methixene either in their pure form or in tablets was developed. The method is based upon, the formation of charge transfer complexes with iodine. The spectra of the complex show maxima at 360 and 275 nm with a high apparent molar absorptivity which facilitates the determination of 1–20 μg.ml−1of the intestigated compounds. The mean recoveries are: 100. 1/2 6 ± 1.38%, 100.32 ± 1.15% and 99.87 ± 1.12% for chlorprothixene, thiothixene and methixene respectively. The method is applied to determine these drugs as single, entities or in certain formulations and the results compare favourably to compendial methods.

ISSN:0038-7010    

DOI:10.1080/00387018808082316

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The reagent 5,5-dimethyl-1,2,3-cyclohexanetrione 1,2-dioxime 3-thiosemicarbazone (DCDT) has been used for the spectrophotometrie determination of cobalt (II). Various factors affecting the sensitivity of this determination have been studied. These factors include wavelength, standing time and pH. The range of applicability of Beer's law on this determination has been concluded and its sensitivity has been calculated and compared with other reagents used for

ISSN:0038-7010    

DOI:10.1080/00387018808082317

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A new simple and rapid quantitative proton magnetic resonance method has been developed for the determination of piroxicam in pure form and in pharmaceutical dosage forms.

ISSN:0038-7010    

DOI:10.1080/00387018808082318

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The infrared spectra (700–100 cm−1) of the complexes [M(ox)2(H2O)2] (ox = 8-hydroxyquinolinate anion, M = Mn, Fe, Co, Ni, Cu, Zn) are discussed. For the purposes of assignment of the metal ligand modes, deuterated 8-hydroxyquinoline-d7was prepared by the Skraup synthesis and the spectra of the deuterated complexes were compared with those of the unlabelled species. Furthermore, [64Zn(ox)2(H2O)2] and [68Zn(ox)2(H2O)2] were prepared by reaction of64ZnSO4and68ZnSO4with 8-hydroxyquinoline and the effects of metal isotope labelling on the spectra were examined and compared with earlier isotopic data on the nickel and zinc complexes.

ISSN:0038-7010    

DOI:10.1080/00387018808082319

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

An approach to the study of calcium binding proteins, is the chemical synthesis of analogues of the single metal ion binding site, and the comparison of their metal ion binding characteristics(1). Synthesized fragments were also characterized as biologically act ive(2).

ISSN:0038-7010    

DOI:10.1080/00387018808082320

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Absorption spectrum of MoN has been obtained in the 500–670 nra region by intracavity laser spectroscopy. Vibrational analysis of A > I Z transition has been carried out. Molecular constants for the upper (A4η) and ground (X4Σ) states have been determined.

ISSN:0038-7010    

DOI:10.1080/00387018808082321

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A low pressure electrical discharge for excitation of polycyclic aromatic hydrocarbons, PAHs, without fragmentation is described. The discharge characteristics as well as the plasma background spectra are given. The application of the discharge for the excitation of molecular spectra of PAHs is described. Difficulties with correction of the analyte emission spectrum for the background emission spectrum of the gas (He) are mentioned. Analytical use of the discharge for detection of PAH3 introduced by gas chromatography is described and is shown to be of marginal analytical use because of the rather poor detection limits of about 1 μg.

ISSN:0038-7010    

DOI:10.1080/00387018808082322

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Fast atom bombardment mass spectrometry (FAB-MS) and high resolution (400 Mz) proton nuclear magnetic resonance (NMR spectroscopy) on the competitive angiotensin II antagonist, |Sar1, Tyr(Me)4(ANGII (Sarmesin) and its he-ptapeptide homolog, [Tyr(Me)3|ANGIII, yield spectra which provide confirmation of structure and molecular weight. The characteristics of the spectra are discussed and compared with the spectra of natural ANG II, ANG III and |Sar1|ANG II. The NMR data are suggestive of interactions in angiotensin between: 1) the phenolic hydroxyl group and the imidazole ring, and 2) the N-terminal amino group and the Tyrring. These interactions may be important for the formation of the proposed charge transfer system in angiotensin II involving the phenoxyl and α-carboxylate groups.

ISSN:0038-7010    

DOI:10.1080/00387018808082323

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor