摘要:

The paper presents measurements of the luminescence spectra of anthracene, anthraquinone and fluorenone following the IR multiple photon excitation of the ground electronic state molecules and the dependence both of the intensity and of decay rates of induced delayed luminescence on excitation energy and foreign gas pressure. The time evolution of a delayed luminescence pulse, its pressure and the laser energy density dependences prove to be similar to those of electronically excited molecules. It is on these grounds as well as on the known spectra, Luminescence under study is a scribed to electronically excited parent molccules .

ISSN:0038-7010    

DOI:10.1080/00387019008054424

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

The reaction of pure 2–4 and 2–6 tolylene diisocyanate with an OH terminated ethylene oxide-dimethylsiloxane-ethylene oxide ABA block copolymer was carried out directly in a n.m.r. tube. The kinetic of the reaction was studied by1H nmr spectroscopy.

ISSN:0038-7010    

DOI:10.1080/00387019008054425

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

The microstructure of polythylene (PE) and chlorinated polythylene (CPE) from solid-phase chlorination have been studed by X-ray diffraction method. The Orientation factor f, crystallinity Xc. crystal size L. and degree of lattice distortion >e2> have been examined. The results shows, with increasing of chlorine content, all the f, Xc and L decrease and with the increase of tensile elongation, the f of stretch CPE increase.

ISSN:0038-7010    

DOI:10.1080/00387019008054426

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

New di-(β-keto) schiff bases were prepared. The molecular structure of those di-(β-keto) schiff bases was determined by1H and C-13 nmr spectroscopy.

ISSN:0038-7010    

DOI:10.1080/00387019008054427

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

The 60 MHz1H NMR spectra of paramethadione, 5-ethyl-3,5-dimethyl-2,4-oxazolidinedione,1, have been studied at 28° in CDCl3solution with the achiral reagent tris(6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionato)europium(III),2, and the chiral reagents tris[3-(trifluoromethylhydroxymethylene)−(+)-camphorato]europium(III),3, and tris[3−(heptafluoropropylhydroxymethylene)−(+)-camphorato]europium(III),4.SubstantiaΔδ values and spectral simplification are achieved with2or4. Significant enatiomeric shift differences, ΔΔδ, are observed with 4 that should provide direct optical purity determinations of − 1, using the C(5)CH3 or the NCH, signals with &:Iratios of 1.3–1.5. Valley height for the CCH, resonance as low as 4.8% was achieved, which should allow detection of as little as 3–4% of the minor enantiomer. Results are discussed in terms of the structural features of I and of the LSR. Substantial nb values and spectral simplification

ISSN:0038-7010    

DOI:10.1080/00387019008054428

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

The results of the investigations of deoxidation rate of oil-covered water obtained by measuring the11H NMR spin-spin relaxation time T2have been reported. This characteristics are related with oils quality and wear.

ISSN:0038-7010    

DOI:10.1080/00387019008054429

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

The solid state −13C-NMR of captopril and its zinc complex were determined by using combined techniques of cross polarization, high-power decoupling and magic-angle spinning. It was shown that the conformation of captopril in solution and solid state are nearly similar as indicated by the NMR studies. However, it was concluded that the captopril-zinc complex has K2ZnL2planartrans-structure (L=Ligand=captopril). This was confirmed also by determining the amount of potassium in the complex through titration with sodium tetraphenylborate.

ISSN:0038-7010    

DOI:10.1080/00387019008054430

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

The objective of the work was to study the nuclear magnetic resonance, of some N-(2-phenoxyethyl)-N,N-dialkylamine towards ortho substitution of a trialkylstannyl moiety and also idoine. A methodology which has shown to be successful in the preparation of radiolabelled tamoxifen (1) and methoxy tamoxifen. Also a study of the behaviour of the corresponding derivative of anisole was done.

ISSN:0038-7010    

DOI:10.1080/00387019008054431

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A simple, accurate and specific proton magnetic resonance (PMR) procedure is developed for the assay of praziquantel and its tablets. The method involves comparing the integral of the multiplet of praziquantel (positioned at δ 7.3 ppm) to that of the sharp singlet signal (positioned at δ 6.3 ppm) of maleic acid which is used as intenal standard. The method reported in this study gives accurate and reproducible results when applied for the analysis of both authentic drug and its tablets. In addition the PMR spectrum helps in confirming the identity and purity of the drug.

ISSN:0038-7010    

DOI:10.1080/00387019008054432

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A theoretical investigation and method of temperature remote sensing determination from the infrared emission line intensities in the fine structure of the rotation—vibration band of the molecules are performed. We have applied the method to some flames that thier combustions are unstationary, short time and violent. The temperature obtained by this method is good agreement with modified sodium line reversal method data. Our results show that the IR emission remote sensing method is a very sensitive, rapid and accurate measured temperature technique.

ISSN:0038-7010    

DOI:10.1080/00387019008054433

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor