The ¹³C T₁s of side-CH₃ group in PPU/PS, AB-crosslinked polymer were measured by using high resolution solid state NMR technique. The motion of side-CH₃ group in this system was analyzed by means of the average spectral density functions of internal rotation. The results showed that the motion of side-CH₃ group of PPU in PPU/PS ABCPs depends on the content of PS. There is a transition in-CH₃ motion when the phase is reversed. The motion of-CH₃ group is related closely to the macroscopic properties of the ABCP. The measurements of ¹H T_lρ were also carried out.

In this paper, we describe a new type of two-dimensional resolved MAS experiments involving a preparation period utilizing cross polarization, several π pulses applied at the TOSS timings and a π/2 pulse, an evolution period in which the magnetization vector is in the z axis and a mixing period composed of a π/2 pulse and a TOSS sequence. The experimental schemes proposed in this paper can yield a complete separation of isotropic and anisotropic chemical shifts, which is a complementary method to the Kolbert's experiment^[5].

The cross polarization theory is generalized by taking into consideration the contribution of non-secular part of heteronuclear dipolar interaction Hamiltonian in laboratory frame (NSH) to cross polarization relaxation. The rapid lattice fluctuation (~10⁸Hz) of a spin system will enhance the effect of NSH. The general formula of cross polarization relaxation rate is given. The application of this theory to cross polarization experiments is analysed and discussed.

The ¹H and ¹³C NMR of a series of arenediazomium salts and their 18-crown-6,dibenzo-24-crown-8 complexes have been recorded to deduce the structure of these complexes from the chemical shift changes before and after complex formation. The bonding of the complexes was also discussed.

The ¹H chemical shifts of ginsenoside-Rb₁ were assigned completely by means of COSY and homonuclear RELAY spectroscopy. Some external cross peaks were observed in single and mutiple homonuclear RELAY spectra, the results of calculation of product operator indicated that these external cross peaks originated from the relayed coherence transfer of long range coupling interaction of protons.

Using Pictet-Spengler condensation, ammonification, methylation, dehydration and decyanation, N^b-methyl-tetrahydroharman and the synthetic intermediates 1S,S、1S,R、2S,S、2S, R、3S,S、3S,R、4S,S、4S, R were obtained. Their ¹H NMR spectra were assigned based on COSY spectroscopy and their configurations of 1-C were determined by NOE experiments. It was shown that for all of the S, S isomers there were NOE relationships between 1-H and 3-H and for all of the S, R isomers NOE relationships between 1-CH₃ and 3-H. Based on the results of NOE and the help of Dreiding stereomodels their conformations were discussed.

ESR spectra of Gadolinium (Ⅲ) complexes with amino acids have not been reported up to now. Synthesis of five amino acid-Gd(Ⅲ) complexes is reported in this paper. The ESR spectra of their powder samples and that of Gd (Ⅲ) complexes in Y zeolite were determined at various temperatures. The crystal field, symmetry and the bonding character of these complexes are discussed.

Off-resonance effect in ¹⁴N remote NQR was studied in detail. It is discovered that the observed ¹⁴N remote NQR signal intensity is strongly dependent on the strength of off-resonance and reaches its maximum value when the offset is close to the rf field strength. This dependence of signal intensity upon off-resonance may be used to increase the sensitivity of the ¹⁴N remote NQR spectrometer. The result is discussed and explained theoretically by the numerical calculation of pulse excitation bandwidth.

Using the method of CO intracavity laser magnetic resonance (LMR), we have detected the σ (△M_J=±1) transitions of υ₂ band of free radical NH₂. About 115 zeeman components in 14 laser lines were detected. Among them 24 Zeeman components in 6 laser lines agree with the previous reported and 91 Zeeman components in 9 laser lines haven't been reported previously.

2,4-diamino-5-methyl-6-substituted-benzyl pyrido-(2,3d) pyrimidines are a kind of promising anticancer drugs. ¹³C NMR spectra of 24 kinds of 7-chloro and 7-oxo compounds have been studied in this paper. The chemical shifts of all carbons in the parent nuclei and subitituted benzyl have successfully been assigned. The influential factors on chemical shifts of all carbons in parent nuclei for two substituted groups have been approached in depth. To date, the data in this paper have not been published in the world.

The studies of the ¹³C NMR and ¹H NMR spectra of the glycerin-ester of 3'-long straight-chain saturated carboxylic acid show that these spectra display striking regularity, and the relationship of NMR with molecular structure is discussed, we have discovered the typical proton's peaks of ABMX₂ system in the ¹H NMR spectrum and the phenomena of magnetically nonequivalent protons.

An alkaloid was isolated from Zhanthoxylum avicennae (Lam). DC.Selective long-range DEPT ¹³C NMR new technique has been used to identify ¹³C nuclei and to connect spin systems separated by quaternary carbons and heteroatoms in the compound. Total assigment of ¹H and ¹³C NMR spectra of the compound were achieved. Its structure has been elucidated as (1).

In this paper, we have introduced some general principles and methods for noise elimination and data compression of 2D NMR spectral data, including phase-sensitive mode, power mode and absolute mode spectra. The idea was originated from the necessity of alleviating some problems of NMR spectrometer, such as user-time tramming and limit storage device. Some technicalities were notified combined with a brief description of the implementation of those methods on Sun SPARC workstation. To show the applicability and feasibility of the methods, we present an experiment instance which gain a 10:1 compression ratio with respect to the original spectral data.

The effect of some pulse parameters on both of the accuracy and the accumulation efficiency in quantitative FT NMR measurements is discussed, which provides a theoretical basis for the optimum choice of these parameters.

Based on the principle of electron spin resonance(ESR) a program for the spectral simulation of solution free radical has been developed written in advanced BASIC language. The electronic energy levels of free radical and their resonance lines are calculated using a first-order approximation theory by assuming a mixed lineshape of Lorentzian and Gaussian function. The range of nuclear spin is from 1/2 to 7/2. Up to 10 different kinds of non-equivalent nuclei are supported, but the number of equivalent nuclei, in principle, is unlimited. The program has been successfully performed on IBM-PC computer. In this paper two examples, the simulation of both the perylene cation radical and nitrobenzene anion radical, are presented.