摘要:

Aldehydes and ketones derived from benzene are generally thought to phosphoresce but not to fluoresce (1). Although fluorescence has been observed from aldehydes and ketones derived from medium and large polycyclic aromatic hydrocarbons in hydroxylic solvents (2), benzaldehyde and aceto-phenone do not fluoresce even in water. However, in concentrated acid media we have observed intense fluorescence from the conjugate acids of benzaldehyde and acetophenone, an observation which has potential analytical significance. Moreover, in concentrated sulfuric acid media, we have observed phosphorescence from the cations derived from benzaldehyde and acetophenone enabling calculation of the dissociation constants of these cations in the lowest triplet state. These observations prompted the examination of the acidity dependences of the electronic spectra of benzaldehyde and acetophenone.

ISSN:0038-7010    

DOI:10.1080/00387017308065422

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The electronic spectra of the isomeric naphthaldehydes and acetonaphthones (naphthyl methyl ketones) have been studied in aqueous and hexane media. In the 2-isomers fluorescence originates from the1Lbstate. In the 1-isomers, solvent interactions in the excited state invert the order of states observed in the absorption spectrum so that the1Lastate is lowest. The 2-isomers show normal excited state ionization behavior indicating that these compounds are about 7-8 orders of magnitude more basic in the1Lbstate than in the ground state. The 1-isomers appear to form stoi-chiometric complexes with the protonating species (H3O+) and are truly protonated in the excited state at higher acidities than would be expected. The reasons for this are not understood but the phenomenon appears to have a kinetic rather than a thermodynamic origin.

ISSN:0038-7010    

DOI:10.1080/00387017308065423

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Infrared and Raman spectra of 2-chloro-4-nitro- and 4-chloro-2-nitroanilines have been recorded for the first time. Assuming Cssymmetry for the molecules, the observed bands have been assigned to different modes of vibration. With the help of these fundamental frequencies of these isomers, the thermodynamic functions have been calculated at various temperature ranging from 100-1500 °K for an ideal gas at one atmosphere under the usual approximations of rigid rotator, harmonic oscillator model and the result is reported here.

ISSN:0038-7010    

DOI:10.1080/00387017308065424

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A complete mass spectral fragmentation pattern of naturally abundant ethyldigermane is presented. The base peak occurs at m/e 148 in the Ge2H×=0←5+region and not in the parent region. Three metastable peaks are observed at m/e 52.70, m/e 59.36, and m/e 125.63 respectively.

ISSN:0038-7010    

DOI:10.1080/00387017308065425

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Force constants (G.V.F.F. and M.U.B.F.F.) for triply charged anions of Scandium, Iron and Gallium have been evaluated using Wilson's G.F matrix method and Muller's mathematical constraint. Generalised mean square amplitudes of vibration for bonded and nonbonded atom pairs and Coriolis coupling constants have also been evaluated.

ISSN:0038-7010    

DOI:10.1080/00387017308065426

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The thermodynamic functions (H0- H00) / T, -(G0- H00)/T, S0and Cp0of phosphirane and aziridine in ideal gas state at selected temperatures to 1000 °K were calculated by the methods of statistical mechanics. The rigid rotator, harmonic oscillator model was used for all fundamental frequencies.

ISSN:0038-7010    

DOI:10.1080/00387017308065427

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Isotopic and variable temperature studies of the far infrared spectra of a series of metal complexes suggest that, under certain circumstances, metal ligand modes may increase in energy markedly as the sample is cooled, whilst internal ligand modes are generally almost insensitive to temperature change.

ISSN:0038-7010    

DOI:10.1080/00387017308065428

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The angular distribution of synchrotron radiation gives no evidence against the Ritz emission theory.

ISSN:0038-7010    

DOI:10.1080/00387017308065429

出版商:Taylor & Francis Group    

年代:1973

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:10.1080/00387017308065421

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor