Synthesis of amidinoformic acids using benzyl cyanoformate as a synthon

An efficient synthesis of a variety of $\text{N}$-substituted or $\text{N}$-unsubstituted amidinoformic acids was developed starting with benzyl cyanoformate.     

Synthesis and X-ray structure study on new Au(I) polymer architectures based on multi-sulfur tentacles

Multi-thiolate ligands are used as a scaffold to construct a series of supramolecules, which cover the following entries; [(1,3-S₂-C₆H₄){AuP(C₆H₄-3-CF₃)₃}₂]_n (1), [(1,4-S₂-C₆H₄){AuP(C₆H₄-3-CF₃)₃}₂]_n (2), (1,4-S₂-C₆H₄){AuP(C₆H₅)₂(2-pyridine)}₂ (3), [(1,3,5-S₃-C₆H₃){AuP(C₆H₅)₂(2-pyridine)}₃]_n (4), and [(1,3,5-S₃-C₆H₃){AuP(C₆H₄-3-CF₃)₃}₃]_n (5). The molecular and crystal structures of these new derivatives have been elucidated by single crystal X-ray diffraction. Aurophilic interactions have been demonstrated for 1, 2, 4, and 5 to produce new supramolecular architectures. Nano-channels are formed by aurophilic and π-π interactions for 1, in which benzene molecules are trapped. An 8 (eight)-shaped loop is formed in solid state for 2. Infinite zigzag chains are constructed for 4 and 5.     

Resonance Raman spectra of the TCNE radical anion dimer in ethanol

Inter-and intra-radical vibrational Raman lines are observed for the TCNE radical anion dimer. Counter-ion independence of the spectrum shows that the dimer forms practically no association with counter ions in ethanol. The intra-radical lines are assigned to the out-of-phase combination modes of the monomer vibrations.     

Dynamic analytical chemistry: A trial study of the interaction of fluorogenic reagents with living chinese hamster ovary cells

The concept of dynamic analytical chemistry, which deals with the qualitative localization or the quantitative transportation of a known or unknown component or its conversion into a product within living cells, is introduced. The concept was tested using cultured Chinese hamster ovary cells in a phosphate-buffered saline medium in the presence of fluorogenic reagents for amines and thiols. The phenomenon was observed and recorded with a fluorescence microscope equipped with a SIT camera. Among the reagents, 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F) added to the culture medium was first trapped at the surface of the cells and then passed inside the cells to react with the mitochondria to give yellow fluorescence, o-Phthalaldehyde and 4-aminosulphonyl-7-fluoro-2, 1,3-benzoxadiazole reacted with the cells to give a blue florescence at certain sites inside the cells. One of the two major components labelled with NBD-F appeared to be phosphatidylethanolamine, a component of the plasma membrane. Its identification and quantitation were effected by conventional analytical techniques, such as thin-layer and liquid chromatography, following enzymatic hydrolysis. The fate of the N-NBD-phosphatidylethanolamine is discussed.     

Effect of electrolysis conditions on photocatalytic activities of the anodized TiO2 films

Photocatalytic activities of anodized TiO₂ films for decomposition of gaseous acetaldehyde were investigated. The anodized TiO₂ films were fabricated by galvanostatic anodization in a mixed electrolyte composed of H₂SO₄, H₃PO₄, and H₂O₂. Pre-nitridation treatment effectively enhanced the photocatalytic activity of the anodized TiO₂ films. The electrolysis parameters such as anodization time, current density, electrolyte temperature, and electrolyte composition significantly affected the photocatalytic activity of the anodized TiO₂ films. The improvement of photocatalytic activity of the anodized films is attributed to increase in surface areas of the anodized specimens.     

Effects of countercations on the structures and redox and spectroscopic properties of diruthenium catecholate complexes with ligand-unsupported Ru-Ru bonds

The molecular structures and physicochemical properties of diruthenium complexes with ligand-unsupported Ru-Ru bonds, generally formulated as [A2{Ru2(DTBCat)4}] (DTB = 3,5- or 3,6-di-tert-butyl; Cat(2-) = catecholate), were studied in detail by changing the countercations. First, the binding structures of the cations in a family of [{A(DME)n}2{Ru2(3,5-DTBCat)4}] (n = 2 for A+ = Li+ and Na+ and n = 1 for A+ = K+ and Rb+) were systematically examined to reveal the effects of the cations on the molecular structures and electrochemical properties. Second, the complex (n-Bu4N)2[Ru2(3,6-DTBCat)4] with a cation-free structure was synthesized using tetra-n-butylammonium cations. The complex clearly demonstrates first that the ligand-unsupported Ru-Ru bonds are essentially stabilized by the dianionic nature of the catecholate derivatives without any other bridging or supporting species. In contrast, the redox potentials and absorption spectra of the complexes can sensitively respond to the countercations depending upon the polarity of the solvents.     

Kagomé type extra-large microporous solid based on a paddle-wheel Cu2+ dimer

A robust extra-large microporous coordination polymer with a Kagomé type structure was synthesized by carboxylate/amine multifunctional ligand with a Cu(2+) cluster and the hexagonal 1D channels ( approximately 15 A) showed type I and IV adsorption isotherms for gas molecules.     

Axial chirality control of tropos BIPHEP-Rh complexes by chiral dienes: synergy effect in catalytic asymmetric hydrogenation

Diastereopure tropos Rh complexes bearing not only BIPHEP but also chiral dienes can be employed as highly enantioselective hydrogenation catalysts for an olefinic substrate.