摘要:

Linear poly (ethylene glycol) (PEG) is able to complex with neutral molecular Iodine in the solution state and in solid state, to produce I−3ions detectable by conventional spectroscopy and by photoacoustic spectroscopy (PAS). This behavior of PEG is another instance of its ability to mimic the complexation features of the macrocyclic polyether 18-crown-6.

ISSN:0038-7010    

DOI:10.1080/00387017908069175

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Atoms of several elements are produced when metal and certain silica refractory samples are heated in a flame. When concentrated HCL is then aspirated a signal enhancement occurs. The peak height of this signal can be used for the analysis of Mn and Cu in nails, Fe in brass and MgO in silica refractory. The technique is very matrix dependant and detection limits are poorer than for conventional atomic absorption.

ISSN:0038-7010    

DOI:10.1080/00387017908069176

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

An NMR procedure is described for the quantitative determination of methylsalicylate as a drug entity and in wintergreen oil. For standard mixtures containing the pure drug a mean result of 99.9 ± 0.75% w/w was obtained. Analysis of a wintergreen oil sample for its contents of methyl-salicylate gave a mean result of 99.2 ± 0.17% w/w. The results are compared with those obtained using the official procedure.

ISSN:0038-7010    

DOI:10.1080/00387017908069177

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Excited state rate constants have been obtained for complexes of rhodamine B and tetrachloroanions of the group IIIA metals. The results were analyzed by comparison with a heavy atom effect model. Other interaction mechanisms were discussed as well as the suitability of this system for time resolved fluorescence analysis.

ISSN:0038-7010    

DOI:10.1080/00387017908069178

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Methods have been developed for measuring the equilibrium binding constants (K) for lanthanide shift reagents with donor substrates. Although Infrared Spectroscopy proved useful1for determining the binding of substituted anilines to the tris-tetramethylheptanedionate of Ytterbium, it was found that NMR was more sensitive and applicable to a wider range of substrates than simple alcohols and amines2,3. The NMR procedure of progressive

ISSN:0038-7010    

DOI:10.1080/00387017908069179

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The X-ray photoelectron spectra of M(N2)2(dppe)2, M(N2)2(PMePh2)4and M(N2)2(PMe2Ph)4; where M=W or Mo, Ph is phenyl, Me is methyl and dppe is (Ph)2P-CH2-CH2-P(Ph)2; have been investigated. The N(1s), P(2p3/2), Mo(3d5/2) and W(4f7/2) binding energies do not show significant differences between these complexes. The N(1s) signals show the separation of 1.3-1.4 eV.

ISSN:0038-7010    

DOI:10.1080/00387017908069180

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A rapid, accurate and precise PMR method is presented for the quantitative determination of codeine and codeine phosphate as bulk drugs and in tablet dosage form. The determination is based on the integration of the C-3 methylprotons or the two aromatic protons of codeine or its salt relative to that of the nine protons of t-butanol. Standard deviations of ± 1.39, 0.27 and 0.65% were obtained for codeine, codeine phosphate bulk drug and codeine phosphate tablets respectively. The method furnishes a specific means of identification of codeine as well as of the simultaneous detection and possible determination of morphine; thus fulfilling one of the most important pharmacopeial requirements for the purity of codeine.

ISSN:0038-7010    

DOI:10.1080/00387017908069181

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

A PMR analytical procedure is described for the quantitation of isoniazid (4-pyridinecarboxylic acid hydrazide) as a drug entity and in tablets dosage form. The method is accurate and precise with a standard deviation of ± 1.51 and ± 1.34 in the bulk drug and in tablets respectively. The results obtained comply with the official standards required by different pharmacopeias. The PMR spectrum, in addition, provides a very specific mean for identification of isoniazid.

ISSN:0038-7010    

DOI:10.1080/00387017908069182

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

We have recently extended our Infrared studies of the binding of anilines with lanthanide shift reagents1to an NMR examination of hindered phenyl-carbinols2and a series of aldehydes and ketones related to benzaldehyde and acetophenone3.

ISSN:0038-7010    

DOI:10.1080/00387017908069183

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

An analysis of the anticrossing of several magnetic hyperfine sublevels of the same fine structure level is made. An expression for the resonance fluorescence signal is derived. Physical requirements for observation are discussed and lineshapes computed.

ISSN:0038-7010    

DOI:10.1080/00387017908069184

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor