摘要:

Electronic absorption and fluorescence spectroscopies are employed to show that anthrone and its cation are closer to carbonyl derivatives of benzene in electronic structure than to derivatives of anthracene. The anion derived from anthrone is, however, a phenolic anthracene anion by electronic structure and by chemical reactivity. The phenolic 9-anthranol tautomer observed in some nonaqueous media is not measurably present in water at room temperatures in the ground electronic state. However, although neither anthrone or 9-anthrol fluoresce in water, there is evidence from the pH dependence of the fluorescence of the anion, to indicate that at least some of the 9-anthrol tautomer is present in the lowest excited singlet state.

ISSN:0038-7010    

DOI:10.1080/00387017308065431

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

A number of workers have used molecular sieves to separate carbon monoxide from air (1,2,3) and it has been shown that PORAPAKÅ Ω is suitable for the resolution of carbon dioxide and sulphur dioxide from air (3,4,5). However, the sensitive detection of such gases frequently presents problems without recourse to the use of large sample volumes.

ISSN:0038-7010    

DOI:10.1080/00387017308065432

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The identification of the position of the C=S absorptions in the IR-spectra of thioureas, thioamides, thiolactams and similar compounds has been a difficult matter1. Just as with the carbonyl group, the C=S absorption was found to be sensitive to the nature of the surrounding structure. Mecke et al2,3compared the carbonyl and thioketone spectra of different compounds of various types. Their priliminary calculations indicated that the ratio νC=O/νC=Swould be about 1.5 and that the C=S frequency would be found in the 1200-1050 cm−1region. Thompson4suggested a range of 1400-1300 cm−1for this absorption. And Randall and his co-workers5have drawn attention to a strong band occuring between 1613 cm−1and 1417 cm−1in the thioureides they studied. Also the C(O)-NH absorption has been the subject of much controversy. The origin of a strong band at rather lower frequencies in secondary amides has been variously assigned as an N-H deformation mode, a C(O)-N stretching mode and as a mixed vibration involving both types of motions. The difficulty in assigning the C=S stretching frequency was in part due to relativey fewer compounds available for the study. Also, the structural dissimilarity of the compounds atudied led to variable assignments of the compounds studied led to variable assignments of the C=5 stretching frequency by different investigators.

ISSN:0038-7010    

DOI:10.1080/00387017308065433

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Spin-spin coupling ofperi-protons has been observed in 6,7-dichloroquinoline for which J45=0.4 Hz.

ISSN:0038-7010    

DOI:10.1080/00387017308065434

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Double magnetic non equivalence in the diisopropyl mercaptale of 2-phenlpropanal is observed.

ISSN:0038-7010    

DOI:10.1080/00387017308065435

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Application of isotopic substitution with65Cu to the study of the far infrared spectra of Bis(L-aminoacidato)copper(II) complexes reveals that metal sensitive vibrations lie atca.380 andca.330 cm−1. They are tentatively assigned as ν(Cu-N) and ν(Cu-O) respectively.

ISSN:0038-7010    

DOI:10.1080/00387017308065436

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

In view of previous studies of tetrafluoroborate solutions1, it appeared interesting to continue further investigations on the interactions of fluorocomplexes with different cations, in general, and of the MF62-fluoro complexes, in particular. In this communication, the high resolution19F NMR data are given for the aqueous and water-acetone solutions of silicon, germanium, tin and titanium hexafluorocomplexes, containing paramagnetic (Co2+, Ni2+, Cu2+, Cr3+) and diamagnetic (Be2+, Mg2+, Zn2+, NH4+) cations.

ISSN:0038-7010    

DOI:10.1080/00387017308065437

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

Rare earth β-diketonates are promising laser materials. Their solid state spectra is expected to give their spectral characteristics. The diffuse reflectance spectra of some rare earth β-diketonates and esters in ultraviolet region have been reported recently by the authors1. The ultraviolet absorption spectra of transition metal chelates have also been reported2,3recently. The spectra of the non-transition metal ion chelates usually consist4only of the metal charge transfer and ligand intramolecular transitions. The ligand transitions in all the cases are characteristic of the coordinated ligand. The spectrum of the ligand, however, helps in assigning the transitions of the co-ordinated ligand. A comparison of the spectrum of ligands and their rare earth complexes1,5,6shows that on complexation no new bands appear in ultraviolet suggesting that unliketransition metalβ-diketonates2,3, charge transfer bands do not appear in the present case. The ligand intramolecular transitions are expected mainly due to the carbonyl group.

ISSN:0038-7010    

DOI:10.1080/00387017308065438

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor

摘要:

The detection of residual pesticide levels in air and soils by remotely sensing their Raman Spectra is the objective of a recently initiated research program in the department. A necessary preliminary step in the endeavor has been to obtain data on the spectral distribution of scattered laser light from pure samples, under laboratory conditions.

ISSN:0038-7010    

DOI:10.1080/00387017308065439

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:10.1080/00387017308065430

出版商:Taylor & Francis Group    

年代:1973

数据来源: Taylor