In the normal methods of T₁ measurement, say IR method, problems of dynamic range will arise when a strong solvent signal and weak mean signals are present together, which will reduce the accuracy of T₁ measurement and it is quite difficult to combine the normal T₁ experiments with available methods of solvent peak suppression. In order to solve this problem, a modified IR method is provided in this paper to measure T₁ with suppression of strong solvent peak. Theoretical explanation, calculation and experimental results are given. It is proved that the accuracy of this new method is the same as the normal IR experiment.

Three kinds of RCCo₃ (CO)₉ and their radicals have been studied with electrochemistry and ESR spectra. The reduction of RCCo₃ (CO)₉ are related to the nature of R and RCCo₃ (CO)₉^· are stable at room temperature. Based on the symmetry analysis of MO, the ESR spectra of cluster radicals are discussed in detail. The sign of hyperfine coupling constant and the nature of the orbital occupied by unpaired electron are determined. Furthermore, the spin density on 3d orbital and 4s orbital of cobalt are calculated from experimental results.

In this paper, ¹H, ¹³C, and ³¹P-NMR spectra of 5 bromide phosphonium salts of general formula (Ph₃ PCHRCHR CO₂H)Br were observed. ¹H, ¹³C, and ³¹P chemical shifts and ³¹P-¹³C coupling constants were determined. The relationship between molecular structure and NMR parameters are discussed.

The electric property and magnetic resonance of mixed conductors Li_1+xV₃O₈ (x=0.1) containing DSPP were studied. By AC measurement, the maximum of total conductivity for sample containing about 6 mol% α-Al₂O₃ was four or six times to that of pure Li_1+xV₃O₈ (x=0.1) at room temperature.
That the addition of DSPP increases the electron density of the sample and electronic and ionic transport frequencies, decreases Li⁺ ionic transport activation energies i e., increases total conductivity of the sample was proved by ESR and NMR qualitative and quantitative analysis of the samples.
The increment of the total conductivity mainly depends on the contribution of the Li⁺ ionic conductivity, the electronic conductivity has a definite influence on it, too.

¹H-NMR semi-quantitative determination of the edible oils was carried out with necessary adjustments of the partial peak integrations in order to correct the interference of the CCH₂C strong peak to the neighbouring weak ones. The amount of each functional group, ratio of quantities among various functional groups, esterification degree, unsaturation degree, average length of the saturated carbon chain, average carbon numbers in the combined fatty acids and average molecular weight per mole of oils were calculated.

Solution conformation of tetrandrine was studied by NMR ¹H NOESY and ¹H-¹³C HETCOR. The success in interpreting all NMR observations in terms of the x-ray crystal diagram is compelling evidence that the solution and solid state conformations are essentially the same.

The ¹³C NMR spectra of seven azo dyes derived from pyridones were measured. The assignment of the peaks was carried out with the aid of Selective Insensitive Nuclear Enhanced by Polarization Transfer technique (SELINEPT). It has been pointed out that the phenomenon of colour-change caused by acid-base is due to the shift of equilibrium in hydrazone-azo tautomerism according to the influence of pH values upon ¹³C chemical shifts, ¹H NMR spectra and UV-VIS absorption spectra. The enhancement of acidity and basicity is in favour of hydrazone and azo forms respectively. The different structures of the pyridone dyes change their colour at quite different pH values.

The ¹H spin-diffusion process of a series of polyurethane zwitterionomers was investigated by a modified Goldman-Shen pulse sequence on a solid NMR spectrometer. The Fickian's diffusion equation was solved according to appropriate boundary and initial conditions. The data treatment was greatly simplified by doing some reasonable assumptions and omissions. The domain sizes of two samples with different degree of ionization were obtained and the influence of ionization on the morphology of the samples is discussed.

The homogeneous photoexcited electron-transfer of PQ₊₊-isopropyl alcohol systems in benzene solution was studied by means of spin trapping-ESR technique. Results show that PQ⁺⁺ may be reduced, by the free radical (CH₃)₂ĊOH, to a free radical PQ_·⁺; the rate of electron transfer can be accelerated greatly when benzophcnone is added to the photoreaction systems.

Active intermediate produced during photolysis of[Rh(CO)₂Cl]₂ and eight cis-dicarbonyl (didentate N-donor ligand) Rh (Ⅰ) tetraphenyl borate[Rh(CO)₂ (Chel)] Bph₄ were investigated by combining spin trapping technique with ESR. The results show that the primary process of photolysis in[Rh(CO)₂Cl]₂ is homolytic cleavage of the Rh-Rh bond to produce Rhodium-centered free radicals. They can be trapped by PBN, ND and TBN. And the photolysis of cisdicarbonyl (bidentate N-donor ligand) Rhodium (Ⅰ) tetraphenyl borate produced ph radicals of Bph₄ anion, and stability of the spin adducts are related to the bidentate N-donor ligand.

We carried out a ¹³C NMR study of humic acid solution from Brown forest soil and Meadow soil under different conditions. The results have shown that the best signal-to-noise ratios in a given time can be obtained by using a large number of transients spaced at short intervals, rather than a smaller number spaced at longer intervals. This is adaptable to semi-quantitative determination of carbon types.

A linear correlation of g_‖ and A_‖ of cupric ion were found for some copper compounds of particular ligands. Relationships between the correlation and structures of coppercontaining compounds have been examined. It is indicated that the relation is concerned with molecular symmetry and properties of a bonding molecular orbit. It is shown that a higher symmetry and a lower covalency of the copper-ligand bondings result in increasing of g_‖ and decreasing of A_‖ absolute value. It is also shown that there is a linear relation between g_‖ vs. β₁² and A_‖ vs. β₁², respectively, for some Cu (Ⅱ)-compounds. By means of experimental values of g_‖and A_‖, an empirical method used to estimate approximate values of β₁² in molecular orbital coefficients is introduced.

In this paper, the hydrogen transfer of gossypol and its imino derivatives (dianilinogossypol, dipyrimidinyliminogossypol and di-n-butyliminogossypol) in various solvents (CDCl₃,DMSO-d₆,C₆D₆,CD₃COCD₃ and DMF-d₇) under different acidic or basic conditions was shudicd by ¹H NMR method. Results show that, three different tautomers existed for each of the above mentioned gossypol imino derivatives, Moreover, the forms of these three tautomcrs are interchangable or co-exist in the same solvent under different conditions.

It was found from the ³¹P NMR spectra that there were cis-and trans isomers in 4,5-dioxO^-2-thiO^-1,3,2,4-diazadiphospholanes. The chemical shifts of the cis-isomer appeared at highfield with larger ²J_PP coupling constant and the trans-isomer at lowficld with smaller coupling constant. It was explained in terms of van der Waals action and conjugated(P→d) π system. The relationship between the ³¹P NMR chemical shifts and substituent in phenyl is also discussed.

The configurations of β, β'-Diaminopinacols were discussed. The stcr-eo-isomers were determined with ¹H-NMR. Comparison of the ¹H-NMR at room temperature and lower temperature proved the results.

2D-NMR, developed in recent ten years, plays an important role in studying structures of organic molecules. four new compounds of 5-fluorouracil derivatives were thoroughly studied by homo-and heteronuclear chemical shift correlation, heteronuclear relayed coherence transfer, and long rangecoupling heteronuclear relayed coherence transfer, and long range coupling heteronuclear chemical shift correlation spectroscopies. The structures and assignments of their ¹H, ¹³C resonances were determined.

The carbon-13 NMR spectra of 1-(4-pyridine acyl)-4-phenyl thioscmicarbazide, 1-(4-pyridine acyl)-4-p-chlorO^-phenylthiosemicarbazide, 1-(4-pyridine acyl)-4-p-bromo-phenylthiosemicarba/ide, 3-(4-pyridinyl)-4-phenyl-1, 2, 4-triazoline-5-thionc, 3-(4-pyridinyl)-p-chloro phenyl-1, 2, 4-triazoline-5-thione, 3-(4-pyridinyl)-p-bromo phenyl-1, 2, 4-triazoline-5-thione and their derivatives were studied in this paper. The chemical shifts of various carbon resonance peaks were assigned by the proton-noise decoupling, Off-resonance, APT-technique, and use of empirical methods. At the same time, the substituent effects of 4-hydrazide in monosubstituted pyridinc were obtained. These parameters are Z₄₂ (Z₄₆) 0.1ppm Z₄₃ (Z₄₅)-3.3ppm and Z₄₄ 3.9ppm (solvent:polysol; reference:TMS).

The fundamental structure and the applied methods of retrieval system in the carbon-13 NMR data bank established by the author^[3] arc described. For the molecular structural discrimination, a pre-retrieval process was adopted, and a set of parameter-retrieval methods was developed in this work.

A pulse sequence of polarization transfer via long-range ¹H-¹³C couplings is introduced. This technique has been carried out on a JEOL FX-90Q NMR spectrometer. It is demonstrated that the selective insensitive nuclei enhancement by polarization transfer via long-range ¹H-¹³C couplings (SELINEPT) is a powerfull tool for measuring quaternary carbon atoms and assignment of the peaks in ¹³C spectra through determining some model compounds.

The ¹³C-NMR spectra of the toluene-alumium chloride-hydrogen chloride system were measured at room temperature. The fast chemical exchange between toluene and its protonated complex as will as complexes themselves in the solution has been verified by means of the ¹³C-NMR spectra, some anomalous phenomena in the experiments are interpreted in this paper.