摘要:

AbstractThe polarized Raman spectrum in crystalline anthracene is recorded using an Ar+laser as the light source. With the polarization data, empirical criteria of assigning molecular vibrations to Agand Bsgrepresentations are derived. These criteria are discussed in the light of the theory developed in Part I of this series.1The lack of vibrational exciton structures in the spectrum of anthracene crystal is the strongest evidence to discredit the conventional polarizability theory and to support the theory presented in Part I.The assignments of 11 Agand 9 Bsgvibrations in anthracene‐h10, and also 12 Agand 7 Bsgvibrations in anthracene‐d10are repor

ISSN:0009-4536    

DOI:10.1002/jccs.196700014

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe ultraviolet absorption spectra of berbines and ϕ‐berbines consist of a single, weak and narrow band in which λmaxposition dependeds on the kind of auxochrome groupi. e., methylenedioxy‐or dimethoxy group attached to 2–3 position. The effect of the auxochrome group at 11–12 position or 12–13 position is very small.The shape of the band of oxyberberine, oxy‐ϕ‐berberine and oxyprotoberberine are similar, especially those of the latter two substances resemble closely.Comparing with isoquinoline, the bands (b), (c) and (d) of G‐berberines and protoberberine are considered as characteristic of isoquinoline structure, while the band (a) in visible region is of berberinium structure, however, the absorption curve of ϕ‐berberines does not show any characteristic of isoquinoline or

ISSN:0009-4536    

DOI:10.1002/jccs.196700015

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThirty alkaloids were separated by polyamide layer chromatography. The Rf values on seven solvent systems were tabulated and their behavior discussed.

ISSN:0009-4536    

DOI:10.1002/jccs.196700016

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY