We have considered the ESR cavity as a photo-chemical reactor under various flow and temperature conditions.Our model system under investigation is the kinetic studies of alkyl nitrites in alcohol media.Various di-hydroxyalkyl and alkoxy-alkyl nitroxide free radial were formed and characterized by their ESR spectra.Of particular interests are the unequivocal detection of enantiomeric di-hydroxylethyl nitroxide radicals and other alkyl-alkoxyl nitroxide radicals. The determination of their conformations has been in terms of vibronic interactions and we find,from the standard valence theory,bond lengths and bond angles,the strong evidence for the intramolecular hydrogen bond formation in these nitroxide radicals,which may be of greater greater importance in other areas of science,such as biochemistry,biology and medicine.

The chemically synthesized tetrasaccharide,protected by acetyl and benzyl,is a keyintermediate of tumor-associated oligosaccharide.¹H NMR and ¹³C NMR chemical shifts of the compound were assigned and its structure was studied in detail by ¹H-¹H COSY、¹³C-¹H COSY、HMBC、TOCSY and ROESY 2D NMR techniques.

Analysis of ¹H and ¹³C NMR spectra of Rhodium compounds trans-((3-MBPA)₂Rh(CO)Cl)(1) and trans-((3-MBPA)₂Rh(CO)Cl)(2),with the aid of H-H COSY,H-C HMQC, H-H LR COSY experiments, has allowed unambiguous chemical shift assignments of all protons and carbons of the compounds.The trans geometry of the compounds has been determined by means of the coupling constants(J_P-Rh,J_P-CO,J_Rh-CO).

This paper reprots the first time on the possibility of an NO₂ molecular magnetometer using Zeeman modulation-magnetic rotation spectroscopic (ZM-MRS)technique.The dependence of intensity of NO₂ ZM-MRS signal at 16846.20cm^-1 on the modulation magnetic field has been measured.Therefore, we provide the design Conception of the magnetometer and discuss its major characteristics in the paper.

The microstructures of impact polypropylenes were investigated by ¹³C NMR spectroscopy.It was found that the ethylene sequence distributions were different in various impact polypropylenes made through distinctive manufacturing procedures. Isotacticity in the porpylene sequences of these copolymers were determined directly from ¹³C NMR spectra in methyl region with the aid of methine Peaks.

Suppression of water peak with pulsed field gradient has been widely used in NMR experiments of biological samples. p selective 90° pulse followed by a z gradient pulse is expected to result in a good suppression.In this paper,the spin dynamics in the presence of gradient field is quantitatively analyzed,and the longitudinal relaxation and the radiation damping effects during the gradient pulsing are discussed.It is shown that high strength and short duration of the gradient are a choice for better water signal suppression.

¹H and ¹³C NMR spectra of polysubstituted xanthones and corresponding xanthone-O-glycoside, which are obtained from the plants of Qinghai-Xizang plateau,have been observed.The discussion are mainly focused on the relation between the chemical shifts and mode of substituted groups on 1,8 position of polysubstituted xanthone.¹H chemical shifts of substituted hydroxy on 1,8 position of xanthone have been summarised.The changes of chemical shift of carbon on xanthone ring caused by -O-sugar have been calculated and discussed.The result can be used to elucidate the structure of polysubstituted xanthone and xanthone-O-glycoslde.

²⁹Si and ¹³C MAS NMR methods have been applied to examine the products in the pyrolysis of several kinds of organic silicon polymers for preparing SiC ceramic.Their structures have been analysed by means of ²⁹Si and ¹³C MAS NMR spectra.The results indicate that the SiC phase can be obtained from the pyrolysis of PC and PCO polymer precursors.

By using the method of ESR elimination of the spin of N-O radical,the photoinduced primary process of photosensitizer aluminum phthalocyanine (A1PCS)was studied.The results showed that the photoproduced anion radical of A1PCS was observed during the A1PCS photodynamic reaction in the presence of Pyrogallo or Cys under anoxic conditions, reflecting that the anion radicals may be another mechanism of A1PCS photosensitization besides the singlet oxygen.

Nitrogen oxide is one of the main pollutant.In nature lightning is a sparkdischarge.Atmosphere molecules react with each other during lightning.Reaction ofnitrogen oxides with other atoms and molecules is one of many reactions.We studiedspark discharging reaction of nitrogen oxide using high sensitivity laser magneticresonance method in laboratory.NO₂ was dissociated to NO after spark discharging.When NO₂ reacted with NH₃,NO₂ was reacted thoroughly after spark discharging.When NO₂ reacted with H₂O,98% of NO₂ was changed after spark discharging.While NO reacted With NH₃,90% of NO was changed after spark discharging.When NO reacted with H₂O,80% of NO was changed after spark discharging. These data are useful for dealing with atmosphere pollution.

The 6-substituted 3-acety1-1,4,6,7-tetrahydro-4-oxoindolo-[2,3-a]quinolizines exhibited antitumer activity and the potency related to 6-substituent.In the present paper 6-methoxycarbonyl-,6-carboxy-,6-amido-,6-hydroxymethyl-and 6-acetylacetomethy1-3-acety1-1,4,6,7-tetrahydro-4-oxoindolo[2,3-a] quinolizine were synthesized,their ¹H NMR are reported,the relationships between HL₆₀ inhibitions and the chemical shifts for some protons are discussed.

This paper deals with the studies of full assignments of ¹H and ¹³C NMR chemical shifts of 2-hydroxy-3,4,6,7-tetramethoxy-9,10-dihydrophenanthrene isolated from Epimedium koreanum by means of 2D NMR spectroscopic analyses.The assignments of ¹³C NMR chemcial shifts of similar compounds published in literatures were reappraised.

The HMQC and HMBC spectra of icariin,a natural flavonoid isolated from theaerial parts of Epimedium grandiflorum,whid showh evident hypotensive action,were studied for the first time.The signals of protons in ¹H NMR and carbons in ¹³C NMR of the Compound were assigned definitely.Some mistakes about assignments of carbon signals were revised by 2D NMR.The attached positions of methoxy,isoprene,rhamnose and glucose in the molecule of the compound were directly confirmed according to the correlated cross peaks in HMBC spectrum.The results of the paper indicate that HMQC and HMBC spectra exert significance on structural elucidation of new natural microcompounds.

A program for baseline correction of EPR spectra is presented.The method in this paper used a polynomial with appropriate order to fit an experimental spectrum baseline.Then the distorted nonlinear baseline is subtracted from the spectrum.After baseline correction,the spectrum is integrated and then the integral result is calculated and tested until the baseline is satisfied.The program written in Borland C⁺⁺ for Windows runs in a few seconds on 486 PC.Experimental results show that the program D simple and very reliable in using and management,especially when used in connection with EPR data acquisition system.