摘要:

Spectral properties of Schiff base complexes involving diamines and aldehydes are widely studied1,2. Platinum (II) complexes of protonated diamines have been synthesised and are reported to possess antitumour activity.1In recent years, there has been considerable interest in the study of structural properties of metal complexes of quadridentate nature. Synthesis of some novel binuclear metal complexes, containing both square planar and tetrahedral metal ions has been Investigated by MacDermott.4They are formed by the reaction of coordinated diamines with an α-hydroxyketone. Other studies involving diamines include the isolation of thorium (IV) and uranium (VI) complexes with tetradentate Schiff bases derived from substituted salicylaldehyde and 1,2-ethanediamine or o-phenylenediamine.5The X-ray crystal structure reveal that the 8-coordi-nated complex molecules have a slightly distorted dodecahedral geometry.

ISSN:0038-7010    

DOI:10.1080/00387018808082288

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The spectrum of singly ionized krypton emitted by a pulsed light source has been studied. Fifty-two lines are classified in the range 1700 - 8700 Å.

ISSN:0038-7010    

DOI:10.1080/00387018808082289

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

A normal coordinate analysis has been carried out for the series Cs2NaLnCl6where Ln represent a trivalent lanthanide cation such as Pr+3, Sm+3, Eu+3, Tb+3, HO+3and Tm+3by using a general valence force field (GVFF). A convenient parametrization has been developed to obtain symmetrized F-matrix elements which are able to reproduce both the experimental frequencies and the expected potential energy distribution for these systems, It is shown that these force fields may be of great interest to calculate vibronic intensities for these complex ions, when a molecular model is adopted, The force fields developed throughout this work have been used to calculate mean amplitudes of vibrations, mean square perpendicular amplitudes and Bastiansen-Morino shrinkage effects at 0 and 298 K.

ISSN:0038-7010    

DOI:10.1080/00387018808082290

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The reagent 1-(2-quinolylazo)-2,4,5-trihydroxybenzene (QAT6) has been used for developing a method for the spectrophotometric determination of cobalt (II). Various factors influencing the sensitivity of this method have been studied. These factors include wavelength, standing time and pH. The range of applicability of this method for the determination of cobalt has been determined. The sensitivity of the method has been compared with other spectrophotometric mthods used for the determination of cobalt. The effect of several ions as interferents with the determination of cobalt has been investigated. The Composition of the Co-QATB complex, its stability constant and its free energy of formation have been determined.

ISSN:0038-7010    

DOI:10.1080/00387018808082291

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Vanadium(III) ions form with cyanoferrate(II) and cyanoruthenate(II) complexes a series of polymeric compounds displaying strong intervalence transfer bands in the visible region. The intervalence transfer energies are linearly correlated with the redox potentials of the cyanometallates, and follow very closely the corresponding data for the Prussian blue complexes.

ISSN:0038-7010    

DOI:10.1080/00387018808082292

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

1H and13C NMR spectra of para-substituted o-HOC6H4CH˭NC6H4X and YC6H4CH˭NC6H4OH-o were determined in CDC13. Reasonable correlations between the azomethine proton and13C chemical shifts and Hammett's σPconstants were obtained. The observed through-resonance effect was attributed to intramolecular hydrogen bonding between the hydrogen at the phenolic group and the imine nitrogen in the molecule.

ISSN:0038-7010    

DOI:10.1080/00387018808082293

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Emission spectrum of the (B-X) band system of HgX-radicals (X˭C1, Br, I) has been observed by passing electrical discharge through flowing vapors of mercury ha1ides. The emission intensity of the most intense band of the (B-X) system of these radicals has been observed to decrease in the presence of other mercury halide vapors at temperatures higher than 130C.

ISSN:0038-7010    

DOI:10.1080/00387018808082294

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Complete13C NMR resonance assignments of a guaianolide 1(10)-epoxide were performed by the use of 2D Heteronuclear Relayed NMR Spectroscopy. This technique allowed detection of connectivities between carbons and directly attached protons and concomitant correlations between vicinal protons.

ISSN:0038-7010    

DOI:10.1080/00387018808082295

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Highly congested terpenoid proton NMR spectra are generally intractable to detailed analysis and assignment. Analyses of the proton-proton connectivity networks in such spectra are, however, possible using the proton double quantum coherence two-dimensional NMR experiment. Natural cycloseychellene, which contains resonances for twenty four protons within a 1.2 ppm wide region is used as an example to demonstrate this technique.

ISSN:0038-7010    

DOI:10.1080/00387018808082296

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Infrared and Raman spectra were obtained for 3,3-dimethylheptane and were interpreted with the aid of normal coordinate calculations. The presence of only three conformers could be verified in this way. Molecular mechanics calculations showed the probable presence of all eleven possible conformers, with concentrations ranging from 27% to 33%. Structural parameters and the heat of formation were obtained from the calculations.

ISSN:0038-7010    

DOI:10.1080/00387018808082297

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor