摘要:

An improved correlation between the binding energy of oxygen core electrons (Eb(Ols)) and the effective charge of the oxygen atom (qo) is proposed: Eb(01s) =4.23-qo+534.1.

ISSN:0038-7010    

DOI:10.1080/00387018708081542

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Titanium dioxide is one of the most throughly investigated chemicals for photochemical conversion of solar energy through splitting of the water molecule. However, its photoresponse is mainly located in the near u. v. region, and so dopants are generally used to extend its photoresponse towards the visible range of the solar spectrum1–4.

ISSN:0038-7010    

DOI:10.1080/00387018708081543

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Some time ago Fournier et al1showed that the “mirage effect”2[the deflection of a light beam by refractive index (n) gradients in a fluid above a heated surface] was two orders of magnitude greater when the fluid was a liquid than when it was a gas. The larger beam deflections arose because of the larger dn/dT changes found with liquids than with gases. Advantage has been taken of this higher sensitivity in a variety of nonspectroscopic and spectroscopic studies (in the visible region of the spectrum) of solids submerged in liquids, and recently Palmer and Smith3, 4and also Varlashkin and Low5have extended the spectral measurements into the infrared (IR) range; IR Fourier transform (FT) spectra of solids submerged in CC14were obtained.

ISSN:0038-7010    

DOI:10.1080/00387018708081544

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

EPR, UV-Vie, and IR measurements were performed to determine the molecular structure of Cu(3-picoline)2(N3)2in solid state. Single crystal EPR spectra indicate non-coupled copper (I1) complexes with gn= 2.265 and g⊥= 2.056. A binuclear complex structure is suggested with end-to-end azido copper (I1) bibridges which are not optimiaed for exchange coupling transmission.

ISSN:0038-7010    

DOI:10.1080/00387018708081545

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Pterocarpin (Fig.1) is a naturally occuring coumarochroman involved with many of its derivatives, which are known for their antifungal activities, in the physiology and the pathology of plants1–7. The UV spectrum already published in the literature(1)has been used for empirical identifications. Its puzzling features have never been explained. The widths of the three observed bands (Fig.2) are obviously too different to assume that these bands are the remains of the vibrational structure of a single electronic transition and they are packed on too a narrow wavelength range to be three different electronic transitions. The bandawhich is the most intense, and the widest one, appears at 310 nm (ϵ-6650). Two sharper ones, respectivelybandc, lie at 286 nm (ϵ 4750) and 280 nm (ϵ =4050). The intensity ofb, when corrected from the overlap withais reduced to ϵ = 2800.

ISSN:0038-7010    

DOI:10.1080/00387018708081546

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The proton spin-lattice relaxation times T1in 2,6-dihydroxynaphtalene-1,3,6,8-tetranitro-naphtalene complex measured at magnetic field 2.1 Tesla as a function of the temperature, are generally long below the room temperature (10–20 Sec.) and exhibit two minima.

ISSN:0038-7010    

DOI:10.1080/00387018708081547

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

We have been interested in the synthesis of branched peptides, by grafting an amine, eg histamine, to the carboxylic group of aspartic acid side chain of Boc-β Ala-Trp-Met-Asp-Phe-NH2also called Pentagastrin (or α-PG). Depending on the coupling conditions used, the main product obtained might be either the wanted derivative or a side-product identified a6 amino-succinyl-pentagastrin (or ASC-PG). Acid or base treatment of this product cleaved the amino-succinyl ring and yielded either α-PG or/and (β-Aspartyl)4-PC or β-PG. Amino-succinylation being a general problem in peptide synthesis of aspartyl residue containing peptides, synthesis of α-PG, β-PG, Asc-PG and their corresponding C-terminal dipeptide amides were performed to be analyzed by mass spectroscopy.

ISSN:0038-7010    

DOI:10.1080/00387018708081548

出版商:Taylor & Francis Group    

年代:1987

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:10.1080/00387018708081541

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor