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  1. Article ; Online: Investigating the Conformations of a Family of [M 2 L 3 ] 4+ Helicates Using Single Crystal X-ray Diffraction

    Matthew J. Wallis / Hyunsung Min / Leonard F. Lindoy / Feng Li

    Molecules, Vol 28, Iss 1404, p

    2023  Volume 1404

    Abstract: We present five new dinuclear triple helicate compounds of types [Mn 2 L 3 ](ClO 4 ) 4 , [Co 2 L 3 ](BF 4 ) 4 , [Ni 2 L 3 ](BF 4 ) 4 , [Cu 2 L 3 ](BF 4 ) 4 , and [Zn 2 L 3 ](BF 4 ) 4 , where L is a previously reported semi-rigid ligand incorporating two ... ...

    Abstract We present five new dinuclear triple helicate compounds of types [Mn 2 L 3 ](ClO 4 ) 4 , [Co 2 L 3 ](BF 4 ) 4 , [Ni 2 L 3 ](BF 4 ) 4 , [Cu 2 L 3 ](BF 4 ) 4 , and [Zn 2 L 3 ](BF 4 ) 4 , where L is a previously reported semi-rigid ligand incorporating two α-diimine primary donor groups and two secondary 4-pyridyl donor groups. All complexes have been characterized in both solution and the solid state. Single crystal X-ray diffraction studies were used to probe the variation in the respective helical structures as the coordinated metal ion was altered, including the effect on the orientations of the secondary binding domains. The influence of the metal ion size, the spin state in the case of Fe(II), and the presence of Jahn-Teller distortions on the overall helical structure has been investigated. These results form a basis for the design and construction of new large metallosupramolecular architectures which manifest properties associated with the constituent helical metalloligand units.
    Keywords metallosupramolecular ; helicate ; transition metal ; metalloligand ; Organic chemistry ; QD241-441
    Subject code 290
    Language English
    Publishing date 2023-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Self-Assembly of a Rare High Spin Fe II /Pd II Tetradecanuclear Cubic Cage Constructed via the Metalloligand Approach

    Hyunsung Min / Alexander R. Craze / Takahiro Taira / Matthew J. Wallis / Mohan M. Bhadbhade / Ruoming Tian / Daniel J. Fanna / Richard Wuhrer / Shinya Hayami / Jack K. Clegg / Christopher E. Marjo / Leonard F. Lindoy / Feng Li

    Chemistry, Vol 4, Iss 38, Pp 535-

    2022  Volume 547

    Abstract: Polynuclear heterobimetallic coordination cages in which different metal cations are connected within a ligand scaffold are known to adopt a variety of polyhedral architectures, many of which display interesting functions. Within the extensive array of ... ...

    Abstract Polynuclear heterobimetallic coordination cages in which different metal cations are connected within a ligand scaffold are known to adopt a variety of polyhedral architectures, many of which display interesting functions. Within the extensive array of coordination cages incorporating Fe(II) centres reported so far, the majority contain low-spin (LS) Fe(II), with high-spin (HS) Fe(II) being less common. Herein, we present the synthesis and characterisation of a new tetradecanuclear heterobimetallic [Fe 8 Pd 6 L 8 ](BF 4 ] 28 ( 1 ) cubic cage utilising the metalloligand approach. Use of the tripodal tris-imidazolimine derivative ( 2 ) permitted the formation of the tripodal HS Fe(II) metalloligand [FeL](BF 4 ) 2 ·CH 3 OH ( 3 ) that was subsequently used to form the coordination cage 1 . Magnetic and structural analyses gave insight into the manner in which the HS environment of the metalloligand was transferred into the cage architecture along with the structural changes that accompanied its occupancy of the eight corners of the discrete cubic structure.
    Keywords cubic cage ; metalloligand ; tripodal ligand ; heterobimetallic ; Chemistry ; QD1-999
    Subject code 290
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Tuneable pressure effects in graphene oxide layers

    Yusuke Sekimoto / Ryo Ohtani / Masaaki Nakamura / Michio Koinuma / Leonard F. Lindoy / Shinya Hayami

    Scientific Reports, Vol 7, Iss 1, Pp 1-

    2017  Volume 7

    Abstract: Abstract Tuneable pressure effects associated with changing interlayer distances in two-dimensional graphene oxide (GO)/reduced GO (rGO) layers are demonstrated through monitoring the changes in the spin-crossover (SCO) temperature (T 1/2) of [Fe(Htrz)2( ... ...

    Abstract Abstract Tuneable pressure effects associated with changing interlayer distances in two-dimensional graphene oxide (GO)/reduced GO (rGO) layers are demonstrated through monitoring the changes in the spin-crossover (SCO) temperature (T 1/2) of [Fe(Htrz)2(trz)](BF4) nanoparticles (NPs) incorporated in the interlayer spaces of the GO/rGO layers. The interlayer separation along the GO to GO/rGO-NP composites to rGO series decreases smoothly from 9.00 Å (for GO) to 3.50 Å (for rGO) as the temperature employed for the thermal reduction treatments of the GO-NP composites is increased. At the same time, T 1/2 increases from 351 K to 362 K along the series. This T 1/2 increment of 11 K corresponds to that observed for pristine [Fe(Htrz)2(trz)](BF4) NPs under a hydrostatic pressure of 38 MPa. The influence of the stacked layer structures on the pseudo-pressure effects has been further probed by investigating the differences in T 1/2 for [Fe(Htrz)2(trz)](BF4) that is present in the composite as larger bulk particles rather than as NPs.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2017-09-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Application of spin-crossover water soluble nanoparticles for use as MRI contrast agents

    Asami Tsukiashi / Kil Sik Min / Hikaru Kitayama / Hiroaki Terasawa / Sosuke Yoshinaga / Mitsuhiro Takeda / Leonard F. Lindoy / Shinya Hayami

    Scientific Reports, Vol 8, Iss 1, Pp 1-

    2018  Volume 5

    Abstract: Abstract Water soluble spin-crossover (SCO) iron(II) nanoparticles (NPs) were synthesized by the polyethylene glycol (PEG) coating of [Fe(Htrz)3-3×(NH2trz)3×](BF4)2 (x = 0, 0.1, 0.5 and 1). The NPs with x = 0.1 show gradual SCO behavior over 280–330 K in ...

    Abstract Abstract Water soluble spin-crossover (SCO) iron(II) nanoparticles (NPs) were synthesized by the polyethylene glycol (PEG) coating of [Fe(Htrz)3-3×(NH2trz)3×](BF4)2 (x = 0, 0.1, 0.5 and 1). The NPs with x = 0.1 show gradual SCO behavior over 280–330 K in water. The relaxation times, T1 and T2, were determined and the thermally-responsive T2 values making these NPs a candidate for use as a MRI contrast agent.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2018-10-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Ultrasensitive Colorimetric and Ratiometric Detection of Cu2+

    Daniel J. Fanna / Luís M. P. Lima / Alexander R. Craze / Adrian Trinchi / Richard Wuhrer / Leonard F. Lindoy / Gang Wei / Jason K. Reynolds / Feng Li

    ACS Omega, Vol 3, Iss 9, Pp 10471-

    Acid–Base Properties, Complexation, and Binding Studies

    2018  Volume 10480

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2018-09-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Super Dielectric Materials of Two-Dimensional TiO2 or Ca2Nb3O10 Nanosheet Hybrids with Reduced Graphene Oxide

    Nurun Nahar Rabin / Shintaro Ida / Mohammad Razaul Karim / Md. Saidul Islam / Ryo Ohtani / Masaaki Nakamura / Michio Koinuma / Leonard F. Lindoy / Shinya Hayami

    ACS Omega, Vol 3, Iss 2, Pp 2074-

    2018  Volume 2083

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2018-02-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Development of an All Solid State Battery Incorporating Graphene Oxide as Proton Conductor

    Yuta Shudo / Md. Saidul Islam / Mohammad Razaul Karim / Nurun Nahar Rabin / Kosuke Wakata / Ryo Ohtani / Masaaki Nakamura / Leonard F. Lindoy / Shinya Hayami

    Global Challenges, Vol 1, Iss 6, Pp n/a-n/a (2017)

    2017  

    Abstract: Graphene oxide (GO) shows high proton conductivity (≈10−4 Scm−1), excellent mechanical stability, and electrical insulation property, which makes it an ideal candidate for use as a proton conducting solid state electrolyte. The prospects of using GO as ... ...

    Abstract Graphene oxide (GO) shows high proton conductivity (≈10−4 Scm−1), excellent mechanical stability, and electrical insulation property, which makes it an ideal candidate for use as a proton conducting solid state electrolyte. The prospects of using GO as single phase solid electrolyte in an all solid battery is presented herein. A battery with the cell configuration: Zn + ZnSO4•7H2O + graphite (anode) || GO (electrolyte) || MnO2 + graphite (cathode) is fabricated. Cyclic voltammetry confirms its rechargeable nature. The respective discharge capacity and power density of the cell are 360 μAh and 19.5 mW kg−1 at a constant current drain of 3 μA under the experimental conditions employed. GO based proton conductors are cleaner and cheaper than other solid electrolytes. The current study strongly suggests that GO can be used as a practical and beneficial component in solid state battery applications with low energy feedback.
    Keywords graphene oxide ; solid electrolyte ; solid state battery ; Technology ; T ; Environmental sciences ; GE1-350
    Subject code 540
    Language English
    Publishing date 2017-09-01T00:00:00Z
    Publisher Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Spin-State Patterning in an Iron(II) Tripodal Spin-Crossover Complex

    Li Li / Suzanne M. Neville / Alexander R. Craze / Jack K. Clegg / Natasha F. Sciortino / Kasun S. Athukorala Arachchige / Outi Mustonen / Christopher E. Marjo / Christopher R. McRae / Cameron J. Kepert / Leonard F. Lindoy / Janice R. Aldrich-Wright / Feng Li

    ACS Omega, Vol 2, Iss 7, Pp 3349-

    2017  Volume 3353

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2017-07-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Co3(PO4)2·4H2O

    Yang Kim / Yu-Chul Park / G. Q. Max Lu / Leonard F. Lindoy / Jack K. Clegg / Young Hoon Lee

    Acta Crystallographica Section E, Vol 64, Iss 10, Pp i67-i

    2008  Volume 68

    Abstract: Single crystals of Co3(PO4)2·4H2O, tricobalt(II) bis[orthophosphate(V)] tetrahydrate, were obtained under hydrothermal conditions. The title compound is isotypic with its zinc analogue Zn3(PO4)2·4H2O (mineral name hopeite) and contains two independent ... ...

    Abstract Single crystals of Co3(PO4)2·4H2O, tricobalt(II) bis[orthophosphate(V)] tetrahydrate, were obtained under hydrothermal conditions. The title compound is isotypic with its zinc analogue Zn3(PO4)2·4H2O (mineral name hopeite) and contains two independent Co2+ cations. One Co2+ cation exhibits a slightly distorted tetrahedral coordination, while the second, located on a mirror plane, has a distorted octahedral coordination environment. The tetrahedrally coordinated Co2+ is bonded to four O atoms of four PO43− anions, whereas the six-coordinate Co2+ is cis-bonded to two phosphate groups and to four O atoms of four water molecules (two of which are located on mirror planes), forming a framework structure. In addition, hydrogen bonds of the type O—H.O are present throughout the crystal structure.
    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2008-10-01T00:00:00Z
    Publisher International Union of Crystallography
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: A second polymorph with composition Co3(PO4)2·H2O

    Yang Kim / Yu-Chul Park / G. Q. Max Lu / Leonard F. Lindoy / Jack K. Clegg / Young Hoon Lee

    Acta Crystallographica Section E, Vol 64, Iss 10, Pp i69-i

    2008  Volume 70

    Abstract: Single crystals of Co3(PO4)2·H2O, tricobalt(II) bis[orthophosphate(V)] monohydrate, were obtained under hydrothermal conditions. The compound is the second polymorph of this composition and is isotypic with its zinc analogue, Zn3(PO4)2·H2O. Three ... ...

    Abstract Single crystals of Co3(PO4)2·H2O, tricobalt(II) bis[orthophosphate(V)] monohydrate, were obtained under hydrothermal conditions. The compound is the second polymorph of this composition and is isotypic with its zinc analogue, Zn3(PO4)2·H2O. Three independent Co2+ cations are bridged by two independent orthophosphate anions. Two of the metal cations exhibit a distorted tetrahedral coordination while the third exhibits a considerably distorted [5 + 1] octahedral coordination environment with one very long Co—O distance of 2.416 (3) Å. The former cations are bonded to four different phosphate anions, and the latter cation is bonded to four anions (one of which is bidentate) and one water molecule, leading to a framework structure. Additional hydrogen bonds of the type O—H.O stabilize this arrangement.
    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2008-10-01T00:00:00Z
    Publisher International Union of Crystallography
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