摘要:

The electronic absorption spectra of a series of 4-aryl-azopyridylpyrazolones were investingated in different organic solvents of different polarities. The ir-spectra analysis suggested the presence of enol-azo and hydrazono-keto tautomeric structures. The1H-nmr-spectra of these compounds were analysed and assigned in term of these proposed tautomeric structures. An additional proof of this finding was given by mass spectral fragmentation analyses.

ISSN:0038-7010    

DOI:10.1080/00387018708081550

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Summary-A 2D NMR study of proton-carbon through space dipolar connectivities has been performed on procaine in DMSO solution. A suitable pulse sequence generated vicinal and geminal heteronuclear Overhauser effects. Long distance dipolar interactions could not be detected due to the low sensitivity of this 2D approach. A combined use of ID and 2D NMR measurements is illustrated for elucidating molecular structures and dynamics by the analysis of heteronuclear through space dipolar interactions.

ISSN:0038-7010    

DOI:10.1080/00387018708081551

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The direct introduction of solid samples into an inductively coupled plasma (ICP) has been studied using ablation of metals by a focused XeCl excimer laser. The laser pulses form a very energetic microplasma at the metal surface from which the ablated species are carried into a stream of argon and are detected using a gated integrator/boxcar averager. This method is applied to the analysis of Ni and Cr in stainless steels.

ISSN:0038-7010    

DOI:10.1080/00387018708081552

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The triplet-triplet (T-T) spectra of twelve symmetrical cyanine dyes have been recorded, using flash photolysis in the presence of triplet state sensitizers. Three sets of dyes have been studied, each set comprising four members which differ from one another by the length of the bridge joining two identical nuclei (quinoline or benzthiazole); the internuclear linking is made by one =CH-, or by a chain composed of three, five, or seven such groups. Excluding the shortest member of each set, the remaining nine dyes are found to follow a common trend: the wavenumber of the 0-0 vibrational peak of the most intenseT-Tabsorption band is linearly related to that of the 0-0 peak of the first singlet-singlet absorption band.

ISSN:0038-7010    

DOI:10.1080/00387018708081553

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Water s-retching bands of crystalline hydrates demonstrate a relative small effect of ions on water spectra. Water band shifts are mainly not bigger than in ice with some exceptions. The reasons of this observation are discussed.

ISSN:0038-7010    

DOI:10.1080/00387018708081554

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Normal coordinate calculations were made for 1-butyne and propionitrile, using a thirty-parameter modified valence force field. Only the C=X stretching force constant was assumed to be different in the two molecules. Fifteen force constants were refined to fit forty frequencies of the two molecules, with the average error being only 2.0 cm−1, or 0.16%.

ISSN:0038-7010    

DOI:10.1080/00387018708081555

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The carbon shifts induced by hydrogen bonding have been measured for complexes between benzylic alcohol and Φ or n bases (from benzene to collidine) of largely varied strengths. Linear relationships are obtained between corrected induced shifts and the IR frequency shifts ΔνOHbut reverse slopes result for the C-1 and C-α carbons of benzylic alcohol.

ISSN:0038-7010    

DOI:10.1080/00387018708081556

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A QR decomposition and the modification of the Gram-Schmidt method in least-squares analysis are presented, as well as a detailed description of the numerical calculation of the rotational constants. The ordinary least-squares technique with the construction of normal equations and the corrected least-squares technique with QR decomposition are compared. These procedures were tested using well-defined synthetic data and the published microwave data on the CS2. molecule.

ISSN:0038-7010    

DOI:10.1080/00387018708081557

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The sensitivity of flame atomizers can be significantly improved. This was achieved using a thermospray injection system. The system eliminated solvent effects on the sensitivity. The atomizer was also attached to the end of an high performance liquid chromatography (HPLC) column permitting direct injection of the effluent without loss of chromatographic resolution.

ISSN:0038-7010    

DOI:10.1080/00387018708081558

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0038-7010    

DOI:10.1080/00387018708081549

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor