摘要:

The general quadratic force constants, coriolis coupling constants and mean amplitudes of vibration have been evaluated for InCl63-using recent vibrational data. The results are employed to study the trend of variation in the isoelectronic sequences e.g. InCl63-, SnCl62-and SbCl6−.

ISSN:0038-7010    

DOI:10.1080/00387017208065406

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

A new electronic band-system in emission has been recorded in the region 6150-5250 Å using a transformer discharge through flowing SeO2vapor. Twentyfour weak red degraded bands have been observed and are attributed to the molecule SeO. A vibrational analysis of the observed bands leads to the conclusion that the upper state involved in the transition is new state b which is situated at 17338.5 cm−1above the ground state. The lower state involved in the transition is the ground state of the molecule. The values of ωe and ωe for the upper and lower states are found to be :

ISSN:0038-7010    

DOI:10.1080/00387017208065407

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

It has been shown1recently that Ag2CrO4has a crystal structure which is unique among simple anhydrous chromates studied to date. Like the chromates of potassium2, rubidium3, and cesium4, it may be assigned to the space group Pnma - D2h16with four formula units per unit cell and chromium atoms on Cssites. However, unlike the alkali-metal chromates, the cations are equally divided between sites of Csand Cisymmetries. Furthermore, metal-oxygen distances in Ag2CrO4range from 2.34 to 2.62Å, as contrasted with 2.7 to about 3.2Å in K2CrO4, and point to a greater degree of convalent bonding between cations and anions.1The present infrared and Raman data have been obtained with an interest in determining the spectral manifestations of this unique structure.

ISSN:0038-7010    

DOI:10.1080/00387017208065408

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

The emission spectrum of the Green Band System of BaF has been photographed on a 35-feet concave grating spectrograph in the second order. Some new bands have been observed and analysed. Precise measurements of the Q1band-heads are used to calculate the band-origins which have led to the determination of accurate molecular constants for the upperC2π1/2and the lower X2Σ states of the molecule. The constants determined are:

ISSN:0038-7010    

DOI:10.1080/00387017208065409

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

As part of an infrared investigation of the kinetics of the reactions of KMnO4in a KI disk and of KIO4in a KI disk, the stoichiometry of the two reactions was needed. A previous study1has shown that MnO4−reacts in a KI matrix to produce IO4−(which then reacts further to form IO3−) and MnO2. Iodate ion is the only observable product in the reaction of IO4−in a KI matrix1. The infrared absorption at 740cm−1, which is due to the presence of IO3−, was found to obey the Beer-Lambert Law. However, calibration curves for KMnO4in KI and for KIO4in KI could not be obtained because both species reacted with the dispersing medium during the preparation of the disk1. It was also observed that no immediate reaction occurred when KBr or KC1 disks containing KMnO4, or KIO4were prepared. Thus, an extrapolation method was sought which would permit the estimation of calibration curves for the reactive species.

ISSN:0038-7010    

DOI:10.1080/00387017208065410

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

Despite numerous studies on the BF4−anion1-6indicating to its complex behavior in different solutions in the presence of different cations, it is still quite difficult to explain this unambiguously. This is ostensibly due to the incompleteness of experimental data both for temperature dependencies and for solution compositions3. Taking this into account, we measured the dependencies of19F NMR spectra in a broad range of temperatures and concentrations in aqueous and water-acetone solutions of Co2+, Ni2+and Zn2+tetrafluoroborate salts on “RYA-2305” and “SWL 2-31/10” instruments in spherical and cylindrical ampoules. The said dependencies were recorded both for BF4−and BF3OH−signals, the latter forming in insignificant quantities due to the hydrolysis of the tetrafluoroborate anion in positively hydrated cation solutions1.

ISSN:0038-7010    

DOI:10.1080/00387017208065411

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor

摘要:

It has been shown recently that the fluorescence efficiency of Eu3+in organic solvents is reduced to a different extent by the solvent molecules located in the primary and in the secondary solvation spheres of the ion(1,2). The primary solvation sphere was associated with the nonradiative quenching processes of the rare-earth ion, kh, whereas molecules located in the secondary solvation sphere were associated with a secondary fluorescence quenching effect i.e. ksolvsecor KQsec. The structure of the primary solvation sphere was found to exert a marked effect upon the fluorescence efficiency and lifetimes of Sm3+in POCl3: SnCl4(3). Furthermore, a pronounced effect, due to both the primary and the secondary solvation sphere, was observed upon the intensity and the splitting of absorption and emission bands of Eu3+associated with electric-quadrupole transitions(4).

ISSN:0038-7010    

DOI:10.1080/00387017208065412

出版商:Taylor & Francis Group    

年代:1972

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:10.1080/00387017208065405

出版商:Taylor & Francis Group    

年代:1972

数据来源: Taylor