Biologically active damardne type ginsenoside-Re was economically isolated from aerial stem and leaves of ginseng and studled by two-dimensional NMR spectrosoopy(2D H,X-COSY,H,H-COSY and DQF-COSY).¹H chemical shift of ginsenoside-Re were as-signed. The ¹H coupling constants of ginsenoside-Re were obtained.

Crystallization of amorphous Ag⁺ ionic conductor 0.85AgI~0.15Ag₄P₂O₇ was studied by Electron-Spin-Resonanee(ESR).The samples were doped with trace amount Of Mn⁺² or V⁺⁴ as spin probe ions and their concentrations are about 10^-3 gram/gram in each sample,their ESR spectra intensities are weakened linearly with the increase of temperature,and the ESR signal disappears when the sample is completely crystallized.Thus the final crystallization temperatures are 98℃ for Mn-doped and 108℃ for V-doped conductors.The ESR spectra of Mn⁺² and V⁺⁴ are analysed.

In this work, several polycyclic aromatic radical cations have been studied for the first time by EPR and ENDOR methods.Among these are the radical cations of 1,4,5,8-tetramethylanthracene;9,10-dideuterio-1,4,5,8-tetramethylanthracene;2,6,9,10-tetramethylanthracene;2,6-dimethyl-9, 10-di(p-methylbenzyl) anthracene;3,6,11,14-tetramethyl dibenzo(a,c)triphenylenes.

The nonsymmetric 2D NOESY experiment has been used to investigate the conformation of cis-platinum complex Pt(NH₃)₂(Guo)₂Cl₂ in deuterium aqueous solution. The results showed that the cyclic conformation of sugar for guanosine in Cis-Pt(NH₃)₂(Guo)₂Cl₂ changes obviously as guanosine coordinates toward platinum.

Ten di-n-butyltin(IV)carboxylates{[ⁿBu₂Sn(O₂CR)]₂O}₂(A1~A5)and ⁿBu₂Sn(O₂CR)₂(B1~B5)(R=1:CCl₃;2:CHCl₂;3:CH₂Cl;4:PhCH=CH;5:2,2,3,3-tetramethylcyclopropyl) were synthesized. Compounds A4、A5 and B5 are first re-ported. All compounds were characterized by elemental analysis, IR,¹H,¹³C and ¹¹⁹Sn NMR spectra. The spectral featurcs of ¹³C and ¹¹⁹Sn NMR spectra and the relation between δ(¹³C or ¹¹⁹Sn)valucs and PKa valucs of the parent acids were disscussed in detail. On this basis, the molecular structures of these compounds were inferred.

This paper deals with the studies of 2D NMR and NOE difference spectra of mogroside V, mogrol-3-o-β-D-glucopyranosyl(1-6)-β-D-glucopyranoside-24-o-{[β-D-glucopyranosyl(1-2)] [β-D-glucopyranosyl(1-6)]}-β-D-glucopyranoside,which were isolated from fresh fruit of Siraitia grosvenorii (Swingle) C. Jeffery.The whole assignment of proton and carbon NMR spectra is given for the first time.

The coordinations of diamagnetic ions, Zn²⁺ and Cd²⁺ with alanine in the present of Fe³⁺ ions,have been investigated by means of NMR T₁ method. The Fe³⁺ ions make T₁ values of Carbons of ligand obviously decreased. After addition of diamagnetic ions,T₁ values are increased due to the competition of coordination and the replaeements of Fe³⁺ ions by diamagnetic ions.The relative coordinating ability of those diamagnetic ions can be elucidated according to the variation of T₁ values.Here a new parameter △ is introduced to represent the coordinating ability of diamagnetic ions.

A new flavonoloside which was isolated from Magnolia biondii Pamp,collected in Henan Provinee was found for the first time. Its chemical component was determined to be 4',5,7-trihydroxy-flavonol-β-7-O-(6"-P-coumoroyl)-D-Glucosyloside by using various NMR spectra(including PBB,APT,NOEDS,COSY,HETCOR,HMQC and HMBC etc.) and is named Biondnod A.

In this paper,the steric structures of the isomers,△(R)∧(S)and △(S)∧(R),for the new synthesized bis(3-substituted X-2,4-pentanedionato)(N-methyl-ethylenediamine)cobalt(Ⅲ) complexes.[Co (Xacac)₂(Me-en)]ClO₄(X=CH₃,Cl,NO₂) were assigned,and the rate constants of deuteration(k_D, 34.0℃) at the chiral nitro-gen for the complexes were measured by ¹H NMR method. The experimental results showed that the k_D values are remarkably affected by the substituent groups.

Several kinds of poly-α-olefines were synthesized as drag reduction agents for crude oils.The segment motion of poly-α-olefines was investigated by using 2,2,6,6-tetramethylpiperidone-1-oxyl as spin probe.It is found that the drag reduction effi-ciency of polyolefines is dependent on both their T_50G and segment motion.

Based on Zimmerman-Brittins model of spin exchange between two phases,the line-shape relaxation correlation technique, also called spin-grouping technique,was analysed.The programs processing experimental data are complied.This technique can be used in the study of NMR apparent and inherent relaxation characteristic of different components in heterogeneous system.In this paper the sample is the healthy fresh mouse muscle.T₁ experment(π-τ-π/2) was performed using h-h,s-h,s-s pulse sequence at high field(0.9T).The results indicate that the T₁=1050 ms,T₂=4500μs component is caused by "free water" in muscle, the proton relative content of which is 69%;the T₁=530 ms,T₂=26 μs component is caused by "bound water"in muscle,the proton relative content of which is 9%, the T₁=530 ms,T₂=1250μs component is caused by various large molecules and organic compounds in muscle,the proton relative content is 9%;the T₁=470 ms,T₂=1250 μs componentis eaused by the fat in the sample,the proton relative content is 13%. Between theproton in muscle tissues and the proton in water fast exchange is dominant but thereis no exchange between the proton in fat and other components.

The structural and spectroscopic properties of three spiroindolinonaphthoxazine derivatives in CDCl₃ and CCl₄ were studied by ¹H and ¹³C NMR spectroscopy. The methods of ¹H-¹H-¹³C COSY, relaxation rate seperation and theorietical simulation of the spin systems were used. The results indicate that compounds Ⅰ,Ⅱ and Ⅲ are in the spiro-like conformation in both solvents.

In this paper we have applied a new procedure to suppress the huge water reso-nanee in the NMR study of HBeAg P3 peptide which is predicted to be an ep itope of hepatitis Be antigens. Adding water selective relaxation reagents, we have success-fully carried out the 1D and 2D NMR experiments of HBeAg P3 pep tide in water solution and accomplished the resonanee assignments of the P3 peptide.

The ¹H and ¹³C NMR spectra for a series of X-substituted benzanilide were obtained and analyzed on the basis of dual parameter equation. The three constants in the equation were determined. The relative importance of resonance effect and field effect were calculated. It was found that the linear correlation between the chemical shifts of N-¹H、C₁、C₂、C₃、C₆ and substituent effect σR、σI was good straight line.

The conformation of 1-OCH₂CH₂C₈F₁₆Cl-maltose in solution has been determined by a combination of 2D NMR and molecular mechanics methods.From a series of NOESY expcriments,one with τ_m=400 ms was selected for H-H distances calculation.The molecular mechanics calculation started with the sugar-rings in chairform,CH₃ used instead of RF group.Conformer 1 is convinced as the stable one in polar solvents by energy minimization. Good agreement is observed between the calculated and expermental H-H distances of conformer 1.

Co-colloidald CS-TIO₂,stabilized with sodium hexameatPhosPhate was PrePared. The charge-transfer state and the free radical intermediates aPPcared during illumination of co-colloidal CdS-TIO₂ were studied by using teehniques of fluoresene and spin tarpping-ESR.It is coneluded that some Photorcaetions in co-colloidal system can carry out more efeetively than those insingle colloidal sys-tem.

Several technieal problems for the measurement of electron spin-lattice relaxation T₁ by the saturation methods are discussed.When the relaxation time T₁ is deter-mined at liquid N₂ temperature,the liquid N₂ in quartz Dewer containing samples usually boils,therefore T₁ is difficult to determine.If the cooling of samples is accomplished by cooling N₂ gas flow,then T₁ is determined.The results of determining spin-lattiee relaxation time T₁ of ZnS:Mn,Cu are attained,and the T₁becomes shorter with the formation of Mn²⁺ clusters.