Reported here are the DNMR spectra of intramolecular processes of some diamagnetic complexes which were synthesized by the reactions of Zn(Ⅱ), Cd(Ⅱ) and Hg(Ⅱ) with 1,3PDTA (1,3-propanediaminetetraacetic acid), respectively. The rate constants and other thermodynamic parameters were obtained by the complete line shape anaylsis. The intramolecular exchange processes are discussed in this paper. It was found that the activation energies of these metal complexes are related to the electrostatic potential of the metal ions.

A series of copolymcrs of β-Cyclodextrin (β-CD) with Epichlorohydrin (EP) was determined by means of ¹H NMR in D₂O or DMSO-d₆ at 60,300 and 400 MHz, and their spectral assignments were given out. Copolymerization mechanism could be ascribed to a nucleophilic addition of hydroxyl group to epoxy group as an active centre. When EP:β-CD=n ≤ 3,the copolymeric molecular chains showed linear or branched structure at β-CD matrix; n ≥ 5, crosslinking network appeared in the chains. The larger n value (here, n ≤ 12), the larger M. W., and the higher crosslinking degree.

The structural analysis of compound (1) was carried out using NMR. Several methods,including ¹H-¹H two-dimensional shift correlation spectroscopy, ¹³C-¹H two-dimensional shift correlation spectroscopy, COLOC (COrrelation spectroscopy via LOng rang Coupling) and DEPT were used for chemical assignment. This investigation demonstrates the power of two-dimensional NMR techniques in the structural determination of natural products.

An NMR method is presented for determining the rotational diffusion constants of the side-chains in polymer solutions and solids, that is, first, the correlation functions and spectral density functions of the rotation of the side-chains were derived, and then the rotational diffusion constants of these side-chains were determined with the aid of ¹³C spin relaxation data. Two applied examples are also discussed.

In this paper we have proposed a new method by which the eigenfield equation can be solved more easily. A general computer programme has been written to calculate EPR spectra using this method. The programme has been applied to investigate angular variation of the EPR Cr³⁺-doped aluminum ammonium alum. The angular variation of the EPR lines for Cr³⁺ has been fitted successfully by this method. The spin-Hamittonian parameters were obtained:
D=0.04845cm^-1, g₂=1.9752 g_x=g_y=1.9761
This example fully illustrates the utility of the eigenfield method.

The ferrichrome analogues mainly have the same function as natural ones. In this work, the relaxation times of the ferrichrome analogue B₂ at different Fe(Ⅲ) concentrations have been measured, and the relative distances from Fe(Ⅲ) ion to all the protons have been also worked out by using a simplified solomon-Bloembergen equation. The conformation of this complex in CDCl₃ solution can be imagined out.

The characters cf powder bilirubin free radicals under UV irradiation were studied by ESR method. It has been discovered that UV light only induced an increase in the concentration of bilirubin superoxide radical and semiquinone radical, but no new free radical forms are produced. It is suggested that the free radical medium[BR⁺ -O₂] of Foote's mechanism for photoxidation of bilirubin is really composed of both of the free radicals mentioned above with simulation of bilirubin ESR spectrum, a further mechanism about the formation of bilirubin free radical under UV irradiction was given. And the relationship between bilirubin photochemical characters and the both free radical concentrations as well as their activity in some conditions was also deduced.

A noninvasive ²³Na NMR technique was used to measure the intracellular sodium concentration of rat erythrocytes taken from animals fed on normal or low selenium content grain. The results showed that (1) selenium deficiency led to the sodium concentration increase (2) the red cells with higher sodium concentration were less resistant to temperature-induced hemolysis than the normal ones and (3) adding Na₂SeO₃ to low selenium grain could restore the sodium concentration of the cells to normal level and also lower the hymolysis rate.

The chemical structure of a new synthetic product 1,2,4,6-tetraphenyl-2 -hydroxyl-8-azabicyclo[3、2、1] octane was studied and identified by various NMR spectra (including NON, SD, BB, DEPT, COSY and HETCOR).

¹³C NMR spectra for the four pairs of new tetrahydro-β-carbolines are reported. Chemical shift assignments have been made for all carbons of the tetrahydro-β-carbolincs by APT, HETCOR & HETCOLOC spectra. The chemical shifts of 5-C & 6 -C can be used for configurational assignments of tetrahydro-β-carbolines, for 5-C & 6-C chemical shifts are easily recongnizable. The downfield one is assigned to 5-C & the upfield one assigned to 6-C. In the spectra of 3a, b & 4a, b, both 3-C & 5-C undergo downfield shifts, compared with the corresponding carbons of la, b & 2a, b. Meanwile, 2 -C & 6-C undergo upfield shifts, presumably owing to slight difference in polarization of the C -N bonding electrons.

The free radicals of hairs from sufferer from different kinds of diseases except cancer have been systematially investigated by ESR. It is found that the diseases have also made great influence on I and P values of patient hair's free radicals. Therefore, it is not allowed simply to take the differences of I and P values between patient's hair and healthy person's hair with the same age as an evidence for judgement of cancer. The ESR measurements of 633 healthy people's hair show again that the statistic rule proposed by authors is valid, that is, the free radical concentration of human hair changes with growing age.

A method for the design of phase cycles in multiple-pulse experiment is demonstrated. Phase arrangements of two kinds of nuclei were designed independently and then phase arrangements with equal columns were combined in parallel order.

A reverse magnetic field was added to a conventional ESR spectrometer in order to get a magnetic field scanning through zero, therefore the microwave signal of a sample at about zero field could be recorded. Two kinds of methods to add reverse magnetic field have been recommended, one is adding compensating Helmholtz coils, another is applying direct current to the rapid scan sweep coils of ESR spectrometer.

A method for prolonging the operation lifetime of klystron in EPR spectrometer was described. Based on this method, a severely degenerated klystron can be utilized for a time, so that the EPR spectrometer may operate continuously, as long as the operation state of the microwave bridge was tuned correctly and the power calibration level of the microwave power leveler was adjusted properly.