An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

A new photoluminescent heterobimetallic Zn(II)–Ag(I) cyano-bridged coordination polymer, [Ag5Zn2(tren)2(CN)9] (tren = tris(2-aminoethyl)amine) (1), has been synthesized and structurally characterized. It features rare linear pentameric unit of dicyanoargentate(I) ions assembled by d10–d10 interaction as building blocks. Solid state emission spectrum of 1 shows strong ultraviolet luminescence with emission peak in the range of 376 nm.

AIM:To investigate the effects of human urotensin II (hUII) on in vivo pia mater microcirculation in rats. METHODS:Adult SD rats were randomly assigned to the following groups: control, sodium chloride injection (NS), UII(10(-6) mol/L), noradrenaline (NA, 10(-6) mol/L), and UII (10(-6) mol/L) + NA (10(-6) mol/L) groups. For recording of microcirculation images in pia mater, skull windows were performed and mounted on the stage of an intravital microscope equipped with a TV camera. Video images of microcirculation were stored by a video cassette recorder. Temporal changes in internal diameter and microcirculatory velocity of microvessels were measured by computer using the Image Pro software. The blood flow in cerebral tissues were measured with PIMII laser Doppler perfusion Imager (Lisca, Sweden). RESULTS:The internal diameters of arterioles and venules in control group were (35.4 +/- 3.6) microm and (40.6 +/- 8.5) microm, respectively. In UII group, the arterioles and venules contracted immediately after treated with UII and up to the peak at 1 min, the internal diameters of arterioles and venules were (25.6 +/- 3.4) microm and (23.4 +/- 3.3) microm, respectively (P < 0.05). Both microcirculatory velocity in arterioles and venules had no significant changes in UII group (P > 0.05). The blood flow in meninges increased 1 min after treated with UII and up to high peak at 5 min (3.5 +/- 0.4 perfusion unit vs. control 2.3 +/- 0.6, P < 0.05). CONCLUSION:hUII can contract microvessels in pia mater of rats and increase microcirculatory blood perfusion to cerebral tissue involved.

Mono-, di-, and tetranuclear Ru(II) polypyridine complexes based on the bridging ligand pdtp, where pdtp is 3-(pyridin-2-yl)-as-triazino[5,6-f]1,10-phenanthroline, have been synthesized and characterizated. This asymmetric bridging ligand is composed of two nonequivalent coordinating sites: one involves the phenanthroline moiety, and the other one involves the pyridyltriazine moiety. Electrochemical data show that the first redox process in these complexes is pdtp based and the metal-metal interaction in di- and tetranuclear complexes is very weak. The two oxidations (+1.41 and +1.56 V vs SCE) observed in dinuclear complex 2 are mainly ascribed to the different coordination environments of two metal centers. Absorption spectra are essentially the sum of the spectra of the component monometallic species. The emission spectra are measured both at room temperature and at 80 K in a 4:1 (v/v) EtOH/MeOH matrix. The complexes all display luminescence properties which are close to that featured by the parent [Ru(phen)(3)](2+) species. It is also noted that center-to-periphery energy transfer occurs in the dendritic tetranuclear complex 3.

Functional molecular films are prepared by alternatively assembling organic and inorganic molecular units in a layer-by-layer fashion. The building blocks of the films are nanometer-sized species carrying either special catalytic or unique chromic properties. Electrostatic interactions are employed as the driving force for assembling. Such films can be assembled on almost any kind of substrate, making it possible to fully characterize their chemical and physical properties.

The adsorption and coadsorption of CO and CN- on electrode of nanometer thin film of palladium (nm-Pd/GC) was studied by using in situ FTIR spectroscopy. The results demonstrated that the nm-Pd/GC electrode exhibited abnormal infrared effects (AIREs) in alkaline solutions as in acid solutions. The characters of AIREs, i.e., the inversion of the direction of IR band, the augmentation of FWHM and the significant enhancement of IR absorption by adsorbed species were observed in all cases of adsorption and coadsorption of CO and CN-. It has been illustrated that strong interaction is existed between adsorbed CO and CN- on nm-Pd/GC surface. The study has contributed towards understanding the surface processes of chemisorption as well as to reveal the origin of nanometer size-effects of thin film materials.

The adsorption of CO on electrodes of nanometer thin films of transition metals (Pt, Pd, Rh, Ru) and alloys (PtPd, PtRu) prepared under cyclic voltammetric conditions has been studied by in situ FTIR spectroscopy. The abnormal infrared effects (AIREs) have been explored as a novel and general phenomenon. The AIREs consist mainly in the inversion of the direction of IR band and the significant enhancement of IR absorption by adsorbed CO species. It was revealed that the enhanced IR absoroption of adsorbed species in AIREs depends strongly on the nature of metal or alloy, and on the structure and the thickness of the thin film. The investigation of AIREs will contribute not only to develop the theory of reflectance IR spectroscopy as well as interfacial electrochemistry, but also to increase the determining sensitivity in applications of interfacial and surface analysis.

Pt, Pd, and Ph films of a few nanometers in thickness supported on glassy carbon (GC) and other substrates were prepared by electrochemical voltammetry. STM patterns illustrated that the prepared thin films are composed of crystallites of layer structure and exhibit a low surface roughness. Studies of in situ FTIR spectroscopy on chemisorption of CO and SCN- and formation of a polymer of o-phenylenediamine (POPD) on electrodes of nanometer thin films have been conducted to explore the abnormal infrared effects (AIREs), which consist of two main characteristics: (1) inversion of IR bands; (2) the enhancement of IR absorption of adsorbates. The results demonstrated that the AIREs depend mainly on the structure and the chemical nature of nanometer thin films. In all cases of chemisorption on thin films of platinum-group metals supported on GC or supported on polymer-covered GC, the direction of IR bands of adsorbates is inverted in comparison with the direction of IR bands of the same adsorbates on corresponding massive metal electrodes. The IR absorption of adsorbed CO species (COad) on nanometer thin films of Ph, Pt, and Pd supported on GC has been enhanced respectively by a factor of 11, 20, and 26. The fact that the IR absorption of adsorbed CO and SCN- has been enhanced but the IR absorption of POPD has not suggested that the IR absorption enhancement in AIREs is related to an effect of short;range domain of surface. The results in the present paper demonstrated also that the AIREs belong to a new phenomenon of IR reflection spectroscopy and relate to effects of material at the nanometer scale. The present study manifests remarkable advantages of AIREs for studying surface processes and may contribute considerably to fundamental studies of electrocatalysis and reflection spectroscopy.

以玻碳为基底 ,通过电化学共沉积的方法制备纳米级厚度的表面合金电极 ,运用电化学原位红外反射光谱研究CO的吸附 .结果表明 ,所制备的Pt-Ru和Pt-Pd纳米级厚度的表面合金电极均具有异常红外效应 ,即吸附在不同表面位上的CO给出的红外谱峰强度增强 ,其方向与相应金属电极表面获得的谱峰方向相反 .研究还显示Pt-Ru和Pt-Pd表面合金在电催化和表面研究中的重要意义 .

CO adsorption on nanometer-thin layer of surface alloys of Pt-Ru and Pt-Pd prepared by electrochemical codeposition has been studied usingin situ FTIR spectroscopy. Abnormal infrared effects (AIREs) that consist of the enhancement of IR absorption by adsorbed CO on different surface sites and the inversion of IR band direction have been observed on the thin-layer prepared. The results also demonstrate the considerable significance of Pt-Ru and Pt-Pd surface alloys in electrocatalysis applications.

The Pd film nano-materials supported on glassy carbon (nm-Pd/GC) were prepared under conditions of electrochemical voltammetry, STM images illustrated that the Pd film consists of crystallites which are composed of nano-particles of Pd with average size at around 6nm, and are of layer shapes. CO adsorption on nm-Pd/GC electrodes manifested abnormal infrared effects (AIREs), i.e., the inversion of IR band direction and the enhancement of IR absorption, In comparison with CO adsorption on massive Pd electrode, an enhancement factor at 42.6 was measured on a nm-Pd/GC electrode of film thickness at 12.2nm, The nm-Pd/GC electrode possesses particular properties for hydrogen reaction, It was revealed that, in contrast to hydrogen absorption by massive Pd electrode, the surface processes of hydrogen adsorption-desorption become the dominant reaction on nm-Pd/GC electrodes, The results demonstrated also that both the AIREs for CO adsorption and the particular properties for hydrogen reaction depend strongly, on the thickness of Pd film, and can be consequently assigned to the nanometer size effect of Pd film materials. The present study has introduced important significance for further studies on surface electrochemistry and electrocatalysis.

The adsorption of CO on surface alloys (Pt-Ru, Au-Ru, Pt-Pd) of nanometer thick layer prepared electrochemically on glassy carbon was studied by using in situ FTIR spectroscopy. The results demonstrated that special IR features were observed on all surface alloy electrodes, illustrating that the abnormal IR phenomenon is a general property for surface with nanometer-thick layer. The present results are significant in understanding the fundamental of reflection spectroscopy, and in extending diverse applications.

The in situ molecular-probe FTIR spectroscopy was employed in the present work to study the adsorption of CO and SCN-on surfaces of dispersed Pt and Pd thin layers, which were deposited electrochemically on glassy carbon (denoted as Pt/GC and Pd/GC) under voltanmmetric conditions, Abnormal IR features of adsorption of CO and SCN- and Pt/GC and Pd/GC have been observed for the first time, In comparison with IR features of adsorption of these molecules on smooth Pt and Pd electrodes, the abnormal IR features consist of mainly the inversion of the direction of IR band and the enhancement of band intensities, The enhancement factors were evaluated at 20 for linearly bonded CO on the Pt/GC surface and at 26 for bridge bonded CO on the Pd/GC surface, Nevertheless other spectral features(the vibrational frequency, the Stark effects, etc.) are nearly the same as those observed on smooth Pt and Pd electrodes, and no significant difference in IR features presented for adsorption of solution species (CO2, SCN-) on the dispersed surfaces, The surface roughness of these dispersed electrodes was measured relatively small (1.6 for Pt/GC and 1.2 for Pd/GC), The present study discovered an interesting IR property of dispersed metallic thin layers, and suggested that the in situ IR spectra of larger signal to noise ration may be obtained by employing the specially prepared Pt/GC and Pd/GC electrodes.

The adsorption of CO on dispersed thin layers of platinum and palladium supported on glassy carbon (Pt/GC and Pd/GC) was studied using in sity multi-step FTIR spectroscopy (MS-FTIRS). Novel properties of the dispersed Pt and Pd thin layers with respect to CO adsorption have been observed for the first time. In comparison to the adsorption of CO on smooth Pt and Pd surfaces, the IR features of CO adsorbed on Pt/GC and Pd/GC electrodes become abnormal, consisting mainly in (1) the direction of the IR band being inverse, (2) the intensity of the IR band being enhanced significantly with an enhancement factor of 20 for linearly bonded CO on Pt/GC and 26 for bridge bonded CO on Pd/GC, and (3) the FWHM of the IR band being broadened by about 6–9 cm−1. The abnormal optic properties of the dispersed Pt and Pd thin layers with respect to CO adsorption were attributed to the particular structure of the thin layers, which is undergoing further investigation.