Thirteen germanium propionyl and substituted germanium propionyl amino acid esters sesquioxide compounds were synthesized by the reaction of trichlorogermanium propionyl chloride with the corresponding amino acid esters respectively, by the use of triethylamine as agent of tied acid followed by hydrolysis. ¹H NMR and ¹³C NMR chemical shifts of the above thirteen compounds were reported. Some relations among the substituent structure and ¹H NMR, ¹³C NMR spectra were first discussed.

This paper reports the ⁹⁵Mo and ³¹P NMR results of a series of heterometallic cluster compounds containing coinage metal and tetraselenomolybdate.The investigation results indicate that ⁹⁵Mo NMR chemical shifts and linewidths are not only related to the number of coordination of Cu atoms, but also very sensitive to structural variations.The ⁹⁵Mo NMR shielding effect is mainly caused by the coiage metal atoms in the tetraselenomolybdate system and the shielding order is Au > Cu > Ag.The saturation of Mo nucleus shielding effect from the coordination of MoSe₄ moiety by four Cu atoms and very little influence on ⁹⁵Mo nucleus from the outsphere ligands are observed. Additionally, kinetic ⁹⁵Mo NMR technique was used to monitor ligand substitution reactions and cluster skeleton transformation processes from MoCu₄ to MoCu₁₀ cores. A variety of characteristics of the ³¹P NMR chemical shifts of Mo(W)-Cu(Ag, Au)-Se compounds among different structural types are also discussed.

Total assignment of ¹H and ¹³C NMR spectral lines of 3, 3-ethylenedioxy-5α, 10α(and-5β, 10β)-cycloxy-Δ⁹⁽¹¹⁾-estrene-17α (1-propynyl)-17β-hydroxyl which are two intermediate isomers of new drug antiprogesterone RU-486, has been accomplished by 1D and 2D NMR techniques (COSY, TOCSY, HMQC and HMBC).

Complete ¹H and ¹³C NMR spectral assignments have been made by using H-H COSY, HMQC and HMBC techniques for active components extracted from green tea including (-) epicatechin (1),(-)-epigallocatechin (2), (-) epicatechin-3-O-gallate (3), (-) epigallocatechin-3-O-gallate (4), Theasinensin B (5)and strictinin (6).

Capsaicin, dihydrocapsaicin and their mixtures were studied by 1D ¹H NMR spectra, ¹H-¹H COSY spectra, 1D ¹³C NMR spectra and DEPT spectra.The ¹H and ¹³C chemical shifts were obained.A method based on NMR spectra was employed to determine the relative content of capsaicin to dihy drocapsaicin in natural capsaicins.

Reaction between NO_x andα-pinene, β-pinene have been studied by LMR. Through determination of NO signals under ultra-violet light and spark discharge respectively, reaction between NO/NO₂ and the above organic gas have been observed. α-pinene and β-pinene can react with NO/NO₂ in spark discharge and more α-pinene reacted than β-pinene. Both α-pinen and β-pinene can react with NO/NO₂ under ultra-violet light while not so acute. All of them are of great importance for understanding atmospheric chemical reaction and photochemical smog.

The novel generalized correlation of the nuclear spin-spin coupling constants with the atomic hybrids and net charges is employed to give new concrete relationships for calculating the directly bonded carbon-carbon and carbon-phosphorus coupling constants by use of the natural hybrid orbital procedure together with the MNDO/EHMO calculation.The calculated values are well in agreement with the experimental data, which suports the idea that the hybridization and bond polarity, and the Fermi contact term are dominant factors in determining carbon-carbon and carbon-phosphorus spin-spin coupling constants across one bond.Thus one is able to interpret and calculate the ¹J_CC and ¹J_CP values based on the simple valence bond theory.

For signals which have the damped amplitude and very low signal-to-noise ratio, the most commonly used methods to estimate parameters are FT, MEM, LPSVD and so on.The results yielded, however, are not satisfactory.Taking the features of the signals into consideration, this paper provides an algorithm modified according to ESPRIT (estimation of signal parameters via rotational invariance techniques)and better results are obtained. A comparison of simulated results with several estimation methods is also given.

Systematic investigation was made on Nuclear Magnetic Resonance (NMR).In this article, a series of various ligands of phosphorus fluoride (GPF₂)where G=F(PF₃), Et₂N, Me₂N, C₅H₁₀N, nPrO, PhO, neoPnO, 2, 5-diMePh, isoPr, etc., and their complexes with several metallic ions and/or atoms such as Ni (0), Cu(I), Mo(0)and Au(I)were examined deeply. Molecular modelling was quantitatively done for ¹⁹F NMR chemical shifts. Some useful rules were found.

Spatially localized one-and two-dimensional NMR spectroscopy has been demonstrated on a MRI system with a phantom sample of methyl methacry lete-naphtyl ethylene copolymer.The conventional STEAM pulse sequence has been implemented for 2D NOESY experiment by inco rporating increment time t₁. The results show high efficiency of suppression of the unwanted signal of H₂O by volume selection. The methods have potential application in vivo MRS study for obtaining valuable information.

In this paper the contribution of two constitutional factors in the sequence of EV copolymers to the ¹³C NMR chemical shift of methylene and methine in copolymer chain structure is describedsy stematically.
The SCS method and the semiempirical method are combined perfectly. The physical meaning of parameters δ_LE and δ₀ are explained clearly. On the basis of the parameter δ_t which is the chemical shift of the trans conformation of polyethylene chan, formula(6) is suggested for the calculation of ¹³C NMR chemical shift of methylene and methine in EV copolymers.
δ_c=δ_t +Σn_iS_i +ΣP_jγ_j
Based on formula (6), the sequences of polyethylene, polypropylene and ethylenevinyl copolymers are discussed respectively.

A formula is proposed for calculating the basic values of ¹³C NMR Chemical Shift:
B=-2.3 +12.95(ΣP) ^1/3sin^0.9θ₁sin^0.5θ₂f/s²+Σα_σ
Calculated chemical shifts of parent compounds accorded with the experimental data.The principle factors to influence chemical shift are the electronic cloud density around the nuclei and its deformation.

In recent years, the computer has been widely used in ESR spectroscopy. A new ESR data system had been developed which can carry out acquisition, processing and simulation of measured data.This sytemconsists of a floppy disk, an interface, a keyboard, a plotter and a graphic display terminal, and is based on a general IBM PC microcomputer. The interface includes a 12 bit DAC to control the magnetic field and to output data to a X-Y recorder and 12bit ADC which can be used to a digital acquisition of ESR spectra. This software has the following three functions:Data acquisition, data processing and spectrum simulation. Data processing composed of several modes:accumulation and average, smoothing, integration, subtraction, gvalue, calculation.This system had been used for analysis and simulation. The advantage of this system is low cost and easy operation.

In the present paper ¹³C chemical shifts of hundreds of tetra-coordinated organogermanium compounds, which were published in the past thirty years, are reviewed.