The CIDEP signal generated in the photochemical process in phenothiazine and 2,2,6,6-tetramethyl piperidingloxyl system can be interpreted by the radical-triplet piar mechanism(PTPM) prposed by Blätter. Furthermoce, the results obtained from fluorescence quenching and photoacoustic calorimetric measurements provide direct confirmation that the assumption of radical (TEMPO) only selective quenching the triplet in the doublet spin state of the radical-triplet pair.

The photoinduced hydrogen transfering reaction in phenothiazine/1,4-naphthoquinone/ethylene glycol system has been investigated by time-resolved electron spin resonance technique. From the measured emission CIDEP signals of neutral 1,4-naphtho semiqinone radical NQH·^*, it is concluded that the rate of hydrogen transfering reaction between ethylene glycol and 1,4-naphthoquinone is much faster than the rate of electron transfering reaction between phenothiazine and 1,4-naphthoquinone. The broadened CIDEP spectra obtained in acidic solution of 1,4-naphthoquinone/ethylene glycol systems indicate that a fast proton exchange process must exist between the spin polarized radicals NQH·^* and NQH·₂^+*.

The photolytic processes of N-phenyl-α-naphthylamine and N-phenyl-β-naphtylamine in benzene solution have been studied by ESR method. Three intermediates, H·, C₆H₅(H)N· and C₁₀H·₇ free radicals, could be detected in the photoreaction system. It is interesting that the carbon-centered free radicals are produced in the processes of photolysis, which implies that the cleavage of C-N bond takes place and C₁₀H·₇ free radicals are produced. Furthermore, research results also show that the ratio of spin adductings can be changed by adjusting the relative concentration of spin trap and the addition of photosensitizer C₆H₅COC₆H₅. In order to ascertain the mechanism of photoreaction processes, some semi-empirical calculations of quantum chemistry were also carried out.

Three aromatic DTPA-bis(amide) gadolinium complexes have been investigated for use as hepatobiliary contrast agents for magnetic resonance imaging. The lipophilicity of the complexes was determined by means of octanol-buffer partition coefficient. The measured and theoretical lipophilicity exhibited good correlation. Protein binding studies show that the more lipophilic complex has higher BSA binding affinity. T₁-weighted spin-echo images of rabbits demonstrated hepatobiliary specific uptake and excretion could also be achieved by adding aromatic rings to the molecule of a paramagnetic complex and were sensitive to the substituents on the aromatic rings.

Time-proportional-phase-increment (TPPI) techique is used to remove the radiation damping related harmonic peaks from two-dimensional correlation (COSY) and multiple-quantum (MQSY) spectra. In 2D experiments, the mixing ^c/2 pulse usually changes the phase of the water magnetization nonlinearly. The combination of this nonlinear phase change with radiation damping results in chemical-shift-offset dependent harmonic peaks. However, if the phase of the mixing pulse is proportional to the evolution time t₁, the harmonic peaks disappear completely while the water peak remains unchanged.

Aqueous solution of inclusion complexes of host 2,3,6-tri-O-methylated β-Cyclodextrin with guest hydroquinone and semiquinone have been studied by ¹H NMR spectroscopy in this paper. The inclusion complex ion resulted from insertion of hydroquinone into the host cavity occurs easily, accompanyed with obvious changes of chemical shift of host methoxyl protons; whereas the same is not true for semiquinone.

A flavonoid compound was isolated from the extract of Acanthophora spicifera, a red alga collected from the South china Sea. Its structure was identified to be 5,7-dihydroxy-2-(4-hydroxyphenyl)-3-O-(6-O-(4-hydroxyphenylcinnamoyl)-β-D-fucopyranoxyl)-4H-1-benzopyran-4-one by IR, UV, FABMS, ¹H-¹H COSY, ¹³C-¹H COSY, HMBC, and its ¹³C NMR data was assigned clearly. This is the first report about a flavonoid compound isolated from a red alga.

The norfloxacin is an effective and safe anti-infective with broadspectrum, and can be taken orally. The interaction of norfloxacin with β-CD has been studied by several analytical techniques, including 1D ¹H NMR, ¹³C NMR, and fluorescence spectra. The experimental results confirmed the existence of a 1:1 inclusion complex of norfloxacin and β-CD. The formation constant of the complex was determined by use of 1D NMR data, a modified Benesi-Hildebrand procedure was employed to calculate the formation constant. A spacial configuration of the complex has been proposed based on these date.

A new sesquiterpene named calamenone was isolated from Acorus calamus L. The relative and absolute structure of the new compound was elucidated on the basis of NMR and CD spectra.

The unique carbon skeleton of 2(5H)-furanone is widely present in a variety of bioactive natural products, optically active γ-substituted butenolides are also useful as chiral synthons for synthesis of a lot of biologically active natural products. It is significant to study the NMR properities of these kinds of compounds because there has been a considerable interest in the synthesis and properities of γ-substituted butenolides recently. In this paper the ¹H NMR and ¹³C NMR of a series of compounds of optically pure 5-((-)-bornyloxy)-3,4-disubstituted-2(5H)-furanone has been made. The effect of substituent groups on structure and chemical shift has been studied also.

Four types of images of kiwifruit, i.e., proton density、diffusion coefficient D distribution、T1 distribution、T2 distribution magnetic resonance image, have been measured on a 4.7T mini imaging system. The T1、T2 and D values corresponding to different parts of kiwifruit were extracted. Three water suppressed ¹H localized spectra were obtained and compared with a high resolution NMR spectrum of kiwifruit juice. The useful information about the morphological structure and material composition of the kiwifruit has been therefore noninvasively gotten.

In this paper, the telechelic star polymer that was synthesized by method of GTP was studied by means of ¹H NMR and ¹³C NMR. The numbers of arms and molecular weight of star polymer was determined by NMR technique.

Compounds 1-8 belong to oleanane type triterpenoids with similiar structures, ¹³C NMR spectra of β-amyrin (1); 3-oxo-olean-11,13(18)-diene (2); 3β-hydroxy olean-11,13(18)-diene (3); 3β,24-dihydroxy-olean-11,13(18)-diene (4); 3,11-dioxo-olean-12-ene (5); 3-oxo-olean-9(11),12-diene (6); 3-oxo, 11α-hydroxy-olean-12-ene(7); 3β,11α-dihydroxy-oean-12-ene-(8) were studied, and spectral assignments were carried out. The assignments were checked by their DEPT spectra. They were divided into three guoups, 2-4 in the first guoup; 1,5,7,8 in the second and 6 in the third. This paper investigated and discussed mainly the changes of their ¹³C NMR chemical shift values which were taken place by the structural characterization and substituted groups. Some significant results of chemical shifts in relation to structures were obtained.

The calculation of ¹³C NMR chemical shift of benzene ring in Aurone, isoAurone, chalcone and dihydrochalcone is reported in this paper.

The structures of two flavones, 5,7-dihydroxy chromone 3-0-α-L-rhamnoside(1) and 7,6'-dihydroxy 3'-methoxylisofavone (2), isolated from Smilax glabra were studied by 2D NMR spectra analyses. The attached positions of substituted groups in 1 and B ring of 2 can be determined by illustrating the COLOC and ¹H-¹H COSY spectra. All the proton and carbon signals of 1 were assigned in detail also.

The solvent effect on the ¹H chemical shifts of N,N'-dicarboxymethyl macrocyclic ether-bislactones was investigated. The experiments show the ¹H chemical shifts of methylenes a、b、c in the title compounds (1-4) which increase with the solvent polarity. The instability of the compound 1 was confirmed by ¹H NMR method. The characteristics of ¹³C NMR spectra of compound 4 due to slow conformation exchange were also discussed in this paper.