A5002460667- Polyoxometalates: Synthesis and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Vanadium and Halogenation Chemistry
- Crystallography and molecular interactions
- Chemical Synthesis and Characterization
- Supramolecular Chemistry and Complexes
- Magnetism in coordination complexes
- Advanced Nanomaterials in Catalysis
- Nanocluster Synthesis and Applications
- Enzyme Structure and Function
- Chemical Synthesis and Reactions
- Porphyrin and Phthalocyanine Chemistry
- Metal complexes synthesis and properties
- Organometallic Compounds Synthesis and Characterization
- Lanthanide and Transition Metal Complexes
- Inorganic Chemistry and Materials
- Organometallic Complex Synthesis and Catalysis
- Nuclear Physics and Applications
- Supramolecular Self-Assembly in Materials
- Catalysis and Oxidation Reactions
- Crystal Structures and Properties
- Microbial Natural Products and Biosynthesis
- Crystal structures of chemical compounds
Nihon University
2015-2024
Vidyasirimedhi Institute of Science and Technology
2023
Tokyo Institute of Technology
2006-2015
Tohoku University
2011-2013
Komatsu (Japan)
2011-2013
Hokkaido University
2012
Okayama Prefecture
2011
University of Manitoba
2011
Tohoku Medical and Pharmaceutical University
2011
Kaohsiung Medical University
2011
Two Molecular Spheres Viruses form highly symmetrical coat structures, capsids, through the assembly of multiple lower-symmetry protein precursors. Recently, chemists have sought to emulate this process on a smaller scale, relying organic molecular struts and metal ions, rather than proteins. Sun et al. (p. 1144 , published online 29 April; see Perspective by Stefankiewicz Sanders ) now demonstrate that mixture palladium ions V-shaped bridging ligands can self-assemble into hollow, nearly...
Simple banana-shaped organic molecules self-organize into finite, spherical coordination networks with a diameter of up to 7 nm (see structure; green Pd, red O, blue N, gray C). These molecular spheres consist 12 equivalent metal centers and 24 ligands have cuboctahedral symmetry. Functional groups (C60 or porphyrin) attached each ligand are aligned equivalently at the periphery sphere.
The distinct properties of fluorous phases are practically useful for separation, purification, and reaction control in organic synthesis. Here, we report the formation a liquid-like droplet, composed 24 perfluoroalkyl chains confined interior 5-nanometer-sized, roughly spherical shell that spontaneously assembled solution from 12 palladium ions bridging ligands. Crystallographic analysis confirmed rigid framework amorphous interior. Perfluoroalkanes can dissolve this well-defined phase,...
Metal-hinged, organic-pillared cages accommodate a limited number (n) of π-stacked molecules in the cavity (see scheme): Discrete n+2 aromatic stacking occurs by accommodation n large guests (n=1–3). Owing to efficient donor–acceptor (D–A) interactions, A–D–A (n=1), A–D–D–A (n=2), and A–D–A–D–A (n=3) stacks are observed, which bring about even–odd-number effects UV/Vis absorption spectra. Supporting information for this article is available on WWW under...
The crystal structure of poly(l-lactic acid) (PLLA) α form has been analyzed in detail by utilizing the 2-dimensional wide-angle X-ray (WAXD) and neutron diffraction (WAND) data measured for ultradrawn sample. WAXD were collected using a synchrotron-sourced high-energy beam wavelength 0.328 Å at SPring-8, Japan WAND 1.510 with cylindrical imaging-plate camera BIX-3 system Atomic Energy Agency. initial model was extracted successfully direct method under assumption space group P212121 about...
In situ crystallographic observation of an extremely labile coordinatively unsaturated transition-metal complex, Cp'Mn(CO)2 (Cp' = methylcyclopentadienyl), was achieved by generating and trapping it within the confined cavity a self-assembled cage in crystalline state at low temperature. The target formed photodissociation CO ligand from stable Cp'Mn(CO)3, which accommodated coordination cage. Being trapped temperature, showed sufficient stability to be analyzed X-ray crystallography....
We synthesized for the first time a series of emissive ring-shaped Re(I) complexes (Re-rings) with various numbers units and lengths bridge ligands. The photophysical properties Re-rings could be varied widely through changes in size central cavity. A smaller cavity induced intramolecular π–π interactions between ligands consequently caused stronger emission longer lifetime excited state. can function as efficient durable photosensitizers. combination trinuclear Re-ring photosensitizer...
The single binding pocket of a self-assembled Pd6L4 coordination cage recognizes oligopeptides in highly sequence-selective fashion. In particular, the Trp-Trp-Ala sequence is strongly bound by cavity (Ka ≥106 M-1). Tripeptides possessing same residues but different sequences (i.e., Trp-Ala-Trp and Ala-Trp-Trp) show much poorer affinity. Even singly mutated tripeptides with aromatic−aromatic−aliphatic (e.g., Trp-Trp-Gly Trp-Tyr-Ala) are not recognized efficiently. X-ray analysis NMR reveal...
Mix and match: The pentagonal [Mo(6)O(21)](n-) polyoxomolybdate building block assembles with other sources of Mo, V, Sb ions to form an orthorhombic Mo-V-Sb oxide. first single-crystal X-ray analysis Mo-V-based oxide, a promising catalyst for light alkane selective oxidation known as the "M1 phase", revealed structure compound.
The concomitant addition of the histone deacetylase inhibitor and DNA methyltransferase to culture medium an entomopathogenic fungus, Isaria tenuipes, greatly enhanced its secondary metabolite production led isolation tenuipyrone (1), a novel polyketide with unprecedented tetracyclic ring system bearing spiroketal structural component, along two known C10-polyketides, cephalosporolide B (2), which is plausible biosynthetic precursor 1, F (3).
Einfache bananenförmige organische Moleküle bilden endliche, sphärische Koordinationsnetzwerke mit Durchmessern bis 7 nm (siehe Bild; grün Pd, rot O, blau N, grau C). Diese molekularen Kugeln bestehen aus 12 Äquivalenten Metallzentren und 24 Liganden haben kuboktaedrische Symmetrie. Wenn alle eine funktionelle Gruppe (C60 oder Porphyrin) tragen, sind diese gleichmäßig über die Peripherie der Kugel verteilt. Supporting information for this article is available on the WWW under...
A 3.5-nm coordination nanotube was self-assembled from 12 Pd(II) ions and four tape-shaped ligands with the aid of a 3.0-nm template. This tubular structure unambiguously determined by single-crystal X-ray analysis. Being cooperatively sustained 24 Pd(II)−pyridine interactions, framework kinetically stable even when template removed. The empty tube was, course, capable binding other molecules in cavity.
In situ crystallography reveals that the solid state [2 + 2] photodimerization of acenaphthylene in a coordination cage takes place smoothly without preorganizaiton reaction centers at preferred geometry, because substrate tumbles thermally large hollow cage.
We demonstrate that an asymmetric composite cluster, [Ag25{C≡CC(CH3)3}16(CH3CN)4(P2W15Nb3O62)] (1), consisting of directly fused polyoxometalate and silver alkynide moieties can be facilely synthesized by a one-pot reaction between Nb-substituted Dawson-type polyoxometalate, H4[α-P2W15Nb3O62](5-), the mixture (CH3)3CC≡CAg CF3SO3Ag. Single-crystal X-ray diffraction revealed structure 1, where Ag atoms are selectively attached to hemisphere pedestal Dawson anion. Its structural integrity in...
Abstract The structure of a dimeric Keggin-typed polyoxotungstate, [Ge2Ti6W18O77]14−, was investigated by X-ray diffractometry and 183W NMR spectroscopy. K9H5[Ge2Ti6W18O77]·16H2O crystallizes in triclinic = 17.582(4), b 22.139(5), c 12.960(2) Å, α 101.26(2), β 94.07(2), γ 109.20(2)°, V 4622(4) Å3. D3d [Ge2Ti6W18O77]14− anion, which gives two resonances at −107.45 −127.76 ppm, consists C3v α-A-[GeTi3W9O40]10− moieties fused together the terminal O atoms 6 Ti atoms.
Metallzentren bilden die Ecken und stabförmige organische Moleküle Kanten von Käfigen (siehe Schema), bis zu drei große aromatische Gäste aufnehmen können, zwischen denen π-Wechselwirkungen auftreten. Wegen der effektiven Donor-Acceptor(D–A)-Wechselwirkungen werden folgende Stapelungen beobachtet: A–D–A (n=1), A–D–D–A (n=2) A–D–A–D–A (n=3). Die Aufnahme einer geraden oder ungeraden Zahl Gästen wirkt sich auf UV/Vis-Spektren aus. Supporting information for this article is available on the WWW...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Structure of Dialuminiohexaeuropiopentakis(hexaniobate): a High-Nuclearity Oxoniobate ComplexTomoji Ozeki, Toshihiro Yamase, Haruo Naruke, Yoshinori SasakiCite this: Inorg. Chem. 1994, 33, 3, 409–410Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs.acs.org/doi/10.1021/ic00081a004https://doi.org/10.1021/ic00081a004research-articleACS PublicationsRequest...
The pH dependence of the structures {Mo(154-x)} mixed-valence oxomolybdate giant clusters were investigated by synchrotron X-ray diffraction systematically prepared crystals containing [Mo138O410(OH)20(OH2)46](40-) (1), [Mo138O410(OH)20(OH2)38](40-) (2), [Mo138O406(OH)16(OH2)46](28-) (3), [Mo142O400(OH)52(OH2)38](28-) (4), [Mo142O432(OH2)58](40-) (5), [Mo148O436(OH)15(OH2)56](27-) (6), [Mo150O451(OH)5(OH2)61](35-) (7), and both [Mo150O442.5(OH)11.5(OH2)64](24.5-)...
Cultivation of Chaetomium mollipilium with nicotinamide, a NAD+-dependent HDAC inhibitor, stimulated its secondary metabolism, leading to the isolation structurally diverse new C13-polyketides, mollipilin A–E (1–5) as well two known compounds (6 and 7). Spectroscopic methods, X-ray single crystal diffraction analysis, VCD elucidated absolute configurations structures 1–6, plausible biosynthetic pathways for 1–7 were proposed based on structural relationships. Mollipilins A (1) B (2)...
Graphiopsis chlorocephala was separated from the surface-sterilized healthy leaves of Paeonia lactiflora (Paeoniaceae) and cultivated with nicotinamide (an NAD+-dependent HDAC inhibitor). The culture conditions significantly enhanced secondary metabolite production in fungus led to isolation a structurally diverse set new benzophenones, cephalanones A–F (1–6), known 2-(2,6-dihydroxy-4-methylbenzoyl)-6-hydroxybenzoic acid (7). structures 1–6 were determined NMR data, single crystal X-ray...
Abstract Peroxo complexes prepared by the reaction of titanoundecatungstophosphate (PTiW11O405−) and dititanodecatungstophosphate (PTi2W10O407−) with hydrogen peroxide are characterized means 183W NMR spectroscopy single crystal X-ray diffractometry. Electronic spectra permanganate titration analyses indicated that one peroxo ligand attaches to PTiW11O405− anion two ligands attach PTi2W10O407− anion. showed Cs symmetry C2 retained in respective derivatives. Single structures diisopropyl...
A new "molecular photoelectronic transducer", working in a cyclic manner totally powered with light irradiation, has been constructed. The UV/blue-controlled repetitive motion of azobenzene moieties 6,6'-bis(4' '-tolylazo)-4,4'-bis(4-tertbutylphenyl)-2,2'-bipyridine causes reciprocal CuI translocation between two coordination environments, resulting pumping the redox potential CuI. Therefore, UV/blue information can be successfully transformed into an electrode change and positive/negative...
Reaction of [(n-C4H9)4N]4[Mo8O26] with nitrate salts rare earth metals yields two different series new compounds [Ln(Mo8O26)2]5- and [{Ln(NO3)3}2(Mo8O26)]4- (Ln = Y, La, Ce, Pr, Nd, Gd, Yb) as tetra-n-butylammonium salts. X-ray structural analyses [(n-C4H9)4N]5[La(Mo8O26)2]·CH3CN [monoclinic, space group P21/c, a 25.8332(6) Å, b 17.5054(7) c 32.6565(12) β 91.699(2)°, Z 4] [(n-C4H9)4N]4[{La(NO3)3}2(Mo8O26)]·2CH3CN P21/n, 17.702(2) 17.2646(12) 18.965(2) 102.132(3)°, 2] revealed that these...
Systematic synthesis routes have been developed for the linear-shaped rhenium(I) oligomers and polymers bridged with bidentate phosphorus ligands, [Re(N^N)(CO)3-PP-{Re(N^N)(CO)2-PP-}nRe(N^N)(CO)3](PF6)n+2 (N^N = diimine, PP phosphine, n 0−18). These were isolated by size exclusion chromatography (SEC) identified 1H NMR, IR, electrospray ionization Fourier transform mass spectrometry, analytical SEC, elemental analysis. Crystal structures of [Re(bpy)(CO)3-Ph2PC≡CPPh2-Re(bpy)(CO)3](PF6)2,...