¹H-NMR and ¹³C NMR of six pairs of α-halocinnamoyt piperidines with substituted aromatic ring are reported. By comparing the ¹H-NMR chemical shift and peak shape of α-H on piperidine ring at various temperatures, the effect of configuration and conformation arc discussed. The configurations of α-halocinnamoyl piperidines were assigned based on chemical shifts and peak shape of a-H on piperidine ring. The correctness of this deduction is also con-firmed by the coupling constants ³J_CCCH of the carbon of carbonyl group and β-proton on the olefinic bond on the ¹³C-NMR.

The active radicals produced in the photochemical hydrogen-abstraction reaction between five Tatty amines and five nitrofluorenones have been studied by means of spin trapping-ESR technique. The results show that the njtro-gen-centered free radicals arc formed in a first priority when there are N-H atoms and α-C-H atoms in amines, and the Carbon-centered free radical is founed only when there is no hydrogen linked to the nitrogen atom (N-H) in amine, as in the case of ceaction for the teitiary amines.

In this paper, the structures of two side products of morpholine were determined by ¹H-NMR, inverted gated decoupling ¹³C-NMR, H-H COSY, C-H COSY, helcronuclear 2DJ. and long-range C-H COSY.

In this paper, the ESR spectra of o-Bcnzoic sulfimide complexes of Mn (Ⅱ) and Cu examined it was observed that at low temperature in pyridinc and at room,emperature after adsorbed by zeolite the ESR spectra of Mn (Ⅱ) conplex exhibit unusual doublet. These spectra may be explained in tenns of a spinhamiltonium by considering unly the M=1/2 ←→M=-1/2 transitions, and theoccurence of forbidden △m=±1 transitions. The ESR spectra of Cu (Ⅱ) complexes in various solvents and at different temperatures were also studied, the bonding characteristic of complexes and their coordinating behaviours in various solutions are discussed.

The ¹³C-NMR spectra of three ethyl 3 (or 4)-x-benzenecarboximidates (1) and eight ethyl N-cyanomethyl-3 (or 4)-x-benzenecarboximidates (2) were determined. All ¹³C chemical shifts were assigned. The substituent chemical shifts (SCS) of -C-OCH₂CH₃=NCH₂CN was obtained. Correlations of the ¹³C chemical shifts of aromatic carbons with the appropriate substituent chemical shifts (SCS) for monosubstituted benzenes show nonadditivity at C-2, 6 in compounds lb-g and 2b-e, at C-1 in compounds 1h-j and 2f-h. Dual subslituent parameter correlations of the ¹³C chemical shifts were also performed in this paper.

A pulse sequence 45_x^°-t₁-90_±y^°-t₂ is proposed for the spin echo of I=3/2 spin systems in powder samples, which is confirmed theoretically and experimentally. It can effectively refocuse the magnetization of the central transition in spin-3/2 quadrupole nuclear systems. And the numerical calculated excitation bandwidth of the echo sequence is also given.

Reported here arc intramolecular process DNMR spectra of some diamagnctic complexes which were synthesized by the reaction of Cd、Hg、Pb and La with DTPA (dicthylcnelriamine pentaacetate), respectively. The rate constants and other thermodynamic parameters were obtained by complete line shape analysis. The intra molecular exchange process is also discussed in this paper, it was found that the activation energies of Cd、Hg and Pb-DTPA complexes are related to the size of the metal ions. The NMR spectrum of La-DTPA shows a double AB type in room temperature, but a single coalescent AB type as the temperature increases. it indicates that the △⇌Λ conversion and the N atom inversion are slow processes within the NMR lime scale.

By means of the spin trapping-ESR technique, the influence of the tube diameters and moisture content in the sample on the radicals produced in the microwave discharge of fatty ether at low pressure has been studied systematically. The results show that:the smaller the diameter of the tube, the faster the formative speed of carbon black, as well as the shorter the lifetime of H atom. With the increase of moisture content, the extent of carbonization becomes more serious. According to the mechanism of discharge, the reasons of the carbonization are discussed.

We observed the difference between the ST-ESR spectra caused by the difference of the dielectric properties of the samples directly. Then we tried to eliminate these differences and the error of the measured τ_C caused by them by using the "power compensation" method. We also studied the effects of the dielectric property of the sample in the whole range in which the ST-ESR spectra are sensitive to τ_C. The results show that the error of the measured τ_C is large and it is necessary to eliminate the error by using the "power compensation" method when we make use of the ST-ESR method.

C-13 CP/MAS spectra of nylon 6 were obtained on MSL-400 spectrometer. It was found that the ω carbon
α β γ δ ω-[CO-CH₂-CH₂-CH₂-CH₂-CH₂-NH]-_n, nylon 6,shows two peaks in the solid state. They are designated as ω₁ and ω₂ which originate from different crystalline components. The two peaks coalesced in solution spectrum of the same sample. It gives the evidence of coexistence of different crystalline regions in solid nylon 6. In the solid state the ω₂ peak is 2.2 ppm upfield from the ω₁ peak.
A series of CP/MAS spectra of nylon 6 was measured by varying the contact time to investigate the dynamic behavior. A SIMPLEX nonlinear least square optimization algorithm was applied to calculate the cross-polarization rates T_IS and T_1P^H. The dynamic parameters of solid nylon 6 were calculated according to Ngai formalism.

The dctermina of four of soman has been studied by NMR chiral shift reagents Eu (TFC)₃ and Eu (MFC)₃. It was found that the complexes of soman with Eu (HFC)₃ in C₆D₆ show larger ¹⁹F NMR shift difference, which can been used for the simultaneous qantitaivc determination of the four stcrcoisomcrs of soman.

The variation of conformation of DNA during its photosensitization damage rocess induced by the interaction of photofrin Ⅱ was studied by ³¹P NMR spectroscopy. The degree of damage and the possible mode of complexation are discussed.

In this paper, the mutual effect of relaxation processes of ¹³C and ¹H in a CH_n group is studied theoretically and experimentally.

The ¹H NMR and UV spectral data of 24 cinnamamides whose α-position was substituted with 13 types of groups are reported. The chemical shifts of β-H were calculated with empirical equation. The result shows that comparison of experimental values with calculated values can be used for concluding cis-or trans-configuration of these compounds. The chemical shifts of phenyl pretons can also give evidence for configuration. For the pairs of these compounds, the chemical shifts of protons on amide nitrogen and the UV spectra arc helpful for assigning configuration.

The ¹³C NMR spectra were recorded for eighteen organotin (Ⅳ) compounds containing alkyl, phenyl, atyl, five-membercd hclcrorings and other polar groups. All the ¹³C spectral lines were asslgned. The Sn-C bond property in alkyl and phenyl us cempouds, and the influcncc of polar substitucnts on C-1 δ values are Jiscassed.The magntudes and orders of carbon-tin coupling constants ⁿJ_C-Sn and the ationship between ⁿJ_C-Sn and ⁿJ_C-Sn were also investigated.

The carbon-13 nuclear magnetic resonance spectra of eight new compounds including 1-nicotinyl-4-phenylthiosemicarbazide and 3-(3-pyridyl)-4-phcnyl-1, 2, 4-triazoline-5-thione were recorded. The chemical shifts of various carbon resonances have been assigned on the basis of the application of proton broad band decoupling and off resonance decoupling techniques, the comparison of signal intensity, the calculation based on substituent effect, and comparison with the chemical shifts of the model compounds. The difference between thiosemicarbazides and 1, 2, 4-triazoline-5-thiones in ¹³C NMR was discussed. In addition, the data of the effect of substituent of hydrazide on the C-13 chemical shifts in 3-monosubstituted pyridines were obtained.

¹H and ¹³C chemical shifts of tert-butyl phenol compounds were determined by NMR. ¹³C-¹H one bond and long-range coupling constants (ⁿJ_COH). ¹³C-¹H gcminal coupling constants over the C-OH chain (²J_COH) and ¹³C-³¹P coupling constants (ⁿJ_CP) in It tert-butyl phenol compounds were obtained.
The coupling constants between aromatic hydrogen and aromatic carbon and the coupling constants between aromatic hydrogen (carbon) and aliphatic carbon (hydrogen) directly attached to aromatic are discussed. Induced and stcric effects on the coupling constants are also discussed.

The mechanism of coordination of isopropyl (diisopropoxy phosphoroyl) acetate (Ⅰ) and isopropyi (dibutoxy phosphoroyl) acetate (Ⅱ) with lanthanum nitrate has been investigated. Results show that the La³⁺ ion coordinates at P=O and C=O for the coordination compound Ⅰ and at P=O for the Ⅱ. Their coordination constants K were determined in CDCl₃ solvent, they are K=0.4 for Ⅰ and K=0.04 for Ⅱ.

Water-suppression is introduced into OSIRIS localized in Vivo spectroscopic technique. By combining presaturation and selective detection episodes, a suppression factor of > 1000 could be readily obtained. The technique could therefore be used to detect and study metabolites in Vivo.