排序方式: 共有43条查询结果,搜索用时 15 毫秒
21.
Bian GQ Kuroda-Sowa T Konaka H Hatano M Maekawa M Munakata M Miyasaka H Yamashita M 《Inorganic chemistry》2004,43(16):4790-4792
The preparation and physical characterization are reported for a novel single-molecule magnet [Mn(12)O(12)(OAc)(12)(dpp)(4)] (dppH = diphenyl phosphate) with no coordinating water molecules. The crystal structure analysis reveals that there are four five-coordinate Mn(III) ions with Mn.H approaches. Addition of water in CD(2)Cl(2) solution was monitored by (1)H NMR, which showed that H(2)O could coordinate to a vacant site of a five-coordinate Mn(III) ion in solution. The measurements and analyses of magnetization hysteresis and ac magnetic susceptibility indicate that the title complex is a single-molecule magnet with a quantum tunneling behavior, whose ground state was tentatively assigned to S = 10 with g = 1.78 and D = -0.60 K. 相似文献
22.
Kiyoshi Matsumoto Mitsuo Toda Hiroyuki Minatogawa Megumu Munakata Shiro Hashimoto 《高压研究》2013,33(1-3):145-152
Abstract Functionalized diaza-18-crown ethers and thioethers were prepared by high pressure SNAr reactions (0.8 GPa, 100°C) of 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane and the related thio analogue with heteroaromatic halides. 相似文献
23.
Jie Dai Xin Wang Guo-Qing Bian Jia-Sheng Zhang Lin Guo Megumu Munakata 《Journal of Molecular Structure》2004,690(1-3):115-119
The metal complex, [Hg2I4(PEDT)]∞ (1), PEDT=4,5-(phenyl-ethylenedithio)-1,3-dithiole-2-thione, has been synthesized and characterized by single crystal X-ray diffraction. It is found to be an unusual organic–inorganic hybrid structure. The inorganic layer is composed of chains of Hg with bridging I, in one case doubly bridged and in the other singly, interconnected by further bridging I to complete the two dimensional connectivity. The organic layers contain pairs of centrosymmetrically related, and therefore head to tail, face to face molecules. Each molecule of such a pair participates in the formation of short SS contacts with a molecule of a centrosymmetrically related neighboring molecule pair thus creating chains of molecules. The connectivity within the organic layer is completed by C–Hπ contacts between the chains. Connectivity between the organic and inorganic layers is achieved by participation of the thione S in the coordination of one type of Hg. 相似文献
24.
A catalyst system consisting of palladium and a peroxo-heteropoly compound in methanol showed 81.6% selectivity for propylene oxide at 42.7% propylene conversion using molecular oxygen as oxidant in an autoclave reactor at 373 K for 6 h. 相似文献
25.
Munakata M Wu LP Kuroda-Sowa T Maekawa M Suenaga Y Ohta T Konaka H 《Inorganic chemistry》2003,42(8):2553-2558
As a continuation of the study on the construction of the multidecker aromatic compounds with pi-pi interactions, the anthracene derivatives 9,10-dimethylanthracene (dman), 9,10-diphenylanthracene (dpan), and 7,12-dimethylbenz[a]anthracene (dmban) have been studied toward complexation with the silver(I) ion. The crystal structures of [Ag(dman)(0.5)(p-xylene)(ClO(4))], [Ag(2)(dpan)(0.5)(C(6)H(6))(0.5)(CF(3)SO(3))(2)], and [Ag(2)(dmban)(2)(ClO(4))(2)](p-xylene), together with the metal-free ligand dpan, have been determined by single-crystal X-ray diffraction. These pi-electron-rich aromatic compounds are found to have great promise as an approach to the effective self-assembly of high nuclearity in a multilayer fashion. 相似文献
26.
Megumu Inaba Kazuhisa Murata Masahiro Saito Isao Takahara 《Reaction Kinetics and Catalysis Letters》2006,88(1):135-141
Summary H-ZSM-5 (Si/Al2 = 29) zeolite showed especially high activity in the conversion of ethanol to BTX (benzene, toluene, xylenes), while other
zeolites exclusively formed ethylene. Noble metal catalysts supported on H-ZSM-5 (29) zeolite have high activity for the formation
of BTX. Of these, Au/H-ZSM-5 catalyst can partially inhibit carbon deposition during the reaction, thus maintaining constant
catalytic activity for BTX formation. 相似文献
27.
Konaka H Wu LP Munakata M Kuroda-Sowa T Maekawa M Suenaga Y 《Inorganic chemistry》2003,42(6):1928-1934
Five novel silver(I) coordination polymers with cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3- thienyl)ethene (cis-dbe) were synthesized and are characterized in this paper. Treatment of AgCF(3)SO(3) or AgCF(3)CO(2) with cis-dbe afforded [Ag(2)(cis-dbe)(CF(3)SO(3))(2)] (1) and [Ag(2)(cis-dbe)(CF(3)CO(2))(2)] (2), and both complexes exhibit a 1-D infinite chain structure with two cyano groups and two thienyl groups of the ligand bridging four metal ions. Reaction of AgC(n)()F(2)(n)(+1)CO(2) with cis-dbe gave rise to an unprecedented cocrystallization of a 2-D sheet structure, [Ag(2)(cis-dbe)(C(n)F(2)(n)(+1)CO(2))(2)], where n = 2 (3), 3 (4), and 4 (5). Upon irradiation with 450 nm light, these five silver(I) complexes turned orange or red from yellow, and the color reverted to yellow on exposure to 560 nm light, indicative of the reversible cyclization/ring-opening reaction occurring in the crystalline phase. Furthermore, different anions gave not only the different structural dimensions but also the different photoresponsive patterns. The correlation between the crystal structures and the photochromic reactivity is discussed. 相似文献
28.
Han J Maekawa M Suenaga Y Ebisu H Nabei A Kuroda-Sowa T Munakata M 《Inorganic chemistry》2007,46(8):3313-3321
Three new metal complexes with 1,2-bis(2'-methyl-5'-(carboxylic acid)-3'-thienyl)perfluorocyclopentene (BM-5-CATP) were synthesized and characterized by X-ray diffraction analysis. BM-5-CATP serves as a bis-monodentate ligand that bridges metal centers to generate three 1D polymers. The two thienyl rings in the three complexes adopt antiparallel fashions, and the distances of 3.39, 3.53, and 3.57 A between the two reactive carbons are short enough to allow photocyclizations to occur in the crystalline phase. [Co(BM-5-CATP)(py)2(MeOH)2] (1) displayed effective photoisomerization in the crystalline phase. Interestingly, solvated 1 underwent a solid-state conversion upon heating to generate, through the release of the coordinated MeOH and rearrangement of the coordination geometry, the desolvated form (1a), while maintaining reversible photochromism. The removal of the solvent led to obvious changes in physical properties such as color and magnetic properties. The ESR spectra of 1 and 1a changed reversibly upon photoexcitation, indicating changes in coordination geometry accompanied by photoreaction. The magnetic susceptibilities of 1 and 1a showed no obvious changes, suggesting that the cobalt-cobalt interaction through the long bridging BM-5-CATP is less effective. Both [Cu(BM-5-CATP)(py)3](EtOH)(py)1.8 (2) and [Zn(BM-5-CATP)(phen)(H2O)] (3) exhibited reversible photoreactions in the crystalline phase. However, 3 did not show remarkable spectral changes because of steric hindrance from the coordinated bulky phenanthroline and the intramolecular H bonds. 相似文献
29.
Maekawa M Konaka H Minematsu T Kuroda-Sowa T Munakata M Kitagawa S 《Chemical communications (Cambridge, England)》2007,(48):5179-5181
Three novel Cu(I) metallacalixarenes with C(2)H(4) and CO legs, in which an anion is accommodated in the inside cavity, were self-assembled by anion templation and have been structurally characterized. 相似文献
30.
Kazuhisa Murata Isao Takahara Megumu Inaba 《Reaction Kinetics and Catalysis Letters》2008,93(1):59-66
Solid acid supports such as H-ZSM5, H-Mordenite, γ-Al2O3, USY and Beta catalysts were modified with Pt. These Pt/oxide catalysts were found to be active for propane formation through
aqueous reforming of glycerol in the presence of hydrogen. The reforming reactions, possibly, proceeded through reaction cycles
of dehydration on acid sites and hydrogenation on Pt sites over the catalysts. 相似文献