Ye Chaohui

Synthesis and structures of cis -WO2 complexes with 2,3-dihydroxynaphthalene

{Na(OCH3)[H3N(CH2)2NH2]2}[WO2(C10H6O2)2] (1) was obtained by the reaction of Na2WO4 · 2H2O with 2,3-dihydroxynaphthalene and ethylenediamine. [H2N(CH2)3NH3]2[WO2(C10H6O2)2] (2) was synthesized by the reaction of Na2WO4 · 2H2O with 2,3-dihydroxynaphthalene and 1,3-propylenediamine. Complex 1 was a one-dimensional chain-like structure and the Na atom is in the structure, while complex 2 was a discrete monomer without Na in its structure. The two complexes were synthesized in the same reaction conditions, except that protonated ethylenediamine was used in reaction 1, but 1,3-propylenediamine in reaction 2.

Single-Shot Magnetic Resonance Imaging of a Moving Object Based on the High-Speed Spiral-Scan Echo Planner Technique at 4.7 T

The single-shot spiral magnetic resonance imaging (MRI) technique was implemented and optimized on a Bruker Biospec47/30 scanner. The technique includes the pulse sequence for generation and detection of the k-space MRI signal (free induction decay (FID)), and PC-based programs for the data grid and image reconstruction. The temporal resolution is 70 ms (14 images per second), which consists of a data acquisition time as short as 13.7 ms, a spin-echo time of 13.6 ms and a magnetization recovery time of 43 ms. This makes it possible to take real-time images of moving objects. The technique is demonstrated using a pendulum (tube) filled with water.

31P and 29Si solid nuclear magnetic resonance studies on the Na3Zr2-xYxSi2-xP1+xO12 system

Abstract 31 P and 29 Si magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy has been used to study, for the first time, a new family of NASICON-type fast ionic conductors, i.e., the Na 3 Zr 2− x Y x Si 2− x P 1− x O 12 solid solution systems. The local environments surrounding phosphorus and silicon atoms in the compounds were deduced from the 31 P and 29 Si NMR spectra. It has been shown that Zr 4+ ions can be substituted for Y 3+ ions in the lattice of Na 3 Zr 2 Si 2 PO 12 and the latter were found to distribute randomly in the crystalline framework.

Crystal Structure, Nano-particle Morphology and Interaction with ATP of [NH3CH2CH(NH2) CH3]2 [M(VI)O2 (OC6H4O)2] (M = Mo0.6 W0.4) and Its Activity to Promote DNA Cleavage

The title complex [NH3 CH2 CH( NH2 ) CH3 ](2) [ M( VI ) O-2 (OC6H4O)(2) ] (M = MO0.6 W-0.4) was synthesized via a simple solution-phase chemical route. The determination of single crystal X-ray diffxaction revealed that the title compound is crystallized in a monochnic system with P2 (1) /n space group, a = 1.0913 (10) nm, b = 1.0442 (10) nm, c = 1.8842 (19) nm, alpha 90 degrees, beta = 96.530 (17)degrees, gamma = 900, Z = 4, and V 2. 133 (4) nm(3). The mononuclear anionic unit [ M (VI) O-2 (OC6 H4O)(2)](2) - displays chiral pseudo-octahedral MO, I coordination geometry and is linked by chiral cations via hydrogen bond and pi center dot center dot center dot pi ir stacking interaction. The transmission electron microscopy images show that the title complex is comprised of nano-particles with diameters ranging from 20 to 50 run. The NMR study shows the H-1 downfield chemical shifts of [NH3CHaHbCH (NH2)CH3] (+) cations in the title complex when it is mixed with adenosine-triphosphate( ATP), and the chemical shift difference between Ha and Hb is increased greatly, and most of the catecholate ligands dissociate from the central metal atoms. The DNA cleavage activity experiment reveals that DNA cleavage promoted by the title complex is lower than that by Na2MoO4 which possesses antitumor property, but higher than that by Na2WO4.

RESEARCH ON VIBRATION MODES OF THE CHINESE CHIME STONE

Nearfield acoustical holography is a powerful tool for imaging of acoustic sources. In this article, the basic theory treating steady-state acoustic radiation with generalized holography has been discussed. By holographic imaging, the vibration characteristics of irregular objects, the Chinese ancient musical instrument, the one-tone chime stone and the two-tone chime stone provided by the Institute of Archaeology, the Museum of Hubei Province, have been researched. The results show that the ancient chime stone has two main vibration modes, which make up the base of sound produced by the instrument. As for the two-tone chime stone, it is not so long and wide as the single-tone chime stone, but thicker and smoother than the single-tone chime stone. When it is excited at different positions, although it radiates sounds of different frequencies, its vibration modes are similar. This may be related to its dimensions and shape. The research is helpful for studying the sound producing system and the radiated field characteristics of the chime stone.

Solid-state NMR Studies on AIPO(4)-5 Molecular Sieve with Al/P > 1

Solid-state NMR. spectroscopy was employed to investigate the coordination state of P and Al, as well as their linkages in a series of newly synthesized aluminophosphate molecular sieve AlPO4-5 with Al/P>1. Both P-31 and Al-27 NMR provides evidence that Al-O-Al linkages are present in the framework of these molecular sieves, which implies that the ordering : rang cut of P and Al does not obey the well-known Loewenstein rule. Apart from the usually observed NMR signals, a broad peak at ca. delta=10 is present in the Al-27 MAS spectra of the calcined and dehydrated AlPO4-5 molecular sieves. Doe to its large second-order quadrupole shift, an isotropic chemical shift of ca. delta=24 was estimated. Hence, we attribute this signal to 4-coordinated aluminium Al[nAl, (4-n)P)] (n=1,2,3,4). Similarly, an additional broad signal at delta=-24 was observed in the corresponding P-31 MAS spectra and is due to the P coordination state in which its second coordinated shell contains Al PETAL (4-n)P](second shell) (n=1,2,3,4).

Phase Separation and Acid Etching of Sodium Borosilicate Glasses Studied by NMR

Multinuclear solid-state NMR, including Si-29, Na-23, B-11 MAS and Si-29 CP/MAS NMR was employed to study the structure change of Na2O-B2O3-SiO2 glasses after 24 hour heat-treatment of phase separation at different temperatures. Then the glasses were etched with acid. The results show that here is a turning point temperature. Being confined by dynamical factors, phase separation did not reach equilibrium below this temperature. The degree of phase separation was reduced when the temperature was decreased. When the temperature was above this turning temperature, the phase separation could reach equilibrium. Being controlled by thermodynamics, the degree of miscibility was enhanced when the temperature was increased. The phase separation was the best when the heat-treatment of phase separation was proceeded at this turning temperature. The NMR results obtained from different resonant nuclei were consistent with one another.

NMR Relaxation Time Weighted Micro-imaging Method for Rock Samples

According to the relations of pixel signal intensity with the repetition time T-R and echo time T-E in spin-echo single slice imaging pulse sequence, by c billing the multi-exponential relaxation procedure of fluids saturated in porous media, the information about pore structure of the tested rink is obtained with T-1- id T-2-weighted micro-imagings, The macro- and micro-pore regions can be distinguished with the information.

THE NMR STUDY OF THE SOLID AND LIQUID LIKE PHASES OF DIOXANE ADSORBED ON CHARCOALS

In this paper a study of the spin lattice relaxation times of dioxane (DO) adsorbed on various charcoals is presented. Results show that the magnetziation of DO decays biexponentially (Table 1) as observed in the case of adsorbed hydrocarbons ([6]). The fast relaxing molecules are considered to be those adsorbed in micropores with radii less than 10 angstrom whose motion is restricted and slowed down, thus they form a solid like phase. However, the slow relaxing ones are those condensed in the micropores, they are free to move and form the liquid like phase. Molecules condensed in the interior of the micropores exchange rapidly with those situated in the vicinity of the pore wall according to Eq. (2).