The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
Robert L Laduca - One of the best experts on this subject based on the ideXlab platform.
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synthesis crystal structure and magnetic properties of two dimensional divalent metal glutarate dipyridylamine coordination polymers with a single crystal to single crystal transformation in the Copper Derivative
Journal of Solid State Chemistry, 2009Co-Authors: Matthew R Montney, Ronald M Supkowski, Richard J Staples, Robert L LaducaAbstract:Abstract Hydrothermal reaction of divalent metal chlorides with glutaric acid and 4,4′-dipyridylamine (dpa) has afforded an isostructural family of coordination polymers with formulation [M(glu)(dpa)]n (M=Co (1), Ni (2), Cu (3); glu=glutarate). Square pyramidal coordination is seen in 1–3, with semi-ligation of a sixth donor to produce a “5+1” extended coordination sphere. Neighboring metal atoms are linked into 1D [M(glu)]n neutral chains through chelating/monodentate bridging glutarate moieties with a syn–anti binding mode, and semi-chelation of the pendant carboxylate oxygen. These chains further connect into 2D layers through dipodal dpa ligands. Neighboring layers stack into the pseudo 3D crystal structure of 1–3 through supramolecular hydrogen bonding between dpa amine units and the semi-chelated glutarate oxygen atoms. The variable temperature magnetic behavior of 1–3 was explored and modeled as infinite 1D Heisenberg chains. Notably, complex 3 undergoes a thermally induced single crystal-to-single crystal transformation between centric and acentric space groups, with a conformationally disordered unilayer structure at 293 K and an ordered bilayer structure at 173 K. All materials were further characterized via infrared spectroscopy and elemental and thermogravimetric analyses.
Matthew R Montney - One of the best experts on this subject based on the ideXlab platform.
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synthesis crystal structure and magnetic properties of two dimensional divalent metal glutarate dipyridylamine coordination polymers with a single crystal to single crystal transformation in the Copper Derivative
Journal of Solid State Chemistry, 2009Co-Authors: Matthew R Montney, Ronald M Supkowski, Richard J Staples, Robert L LaducaAbstract:Abstract Hydrothermal reaction of divalent metal chlorides with glutaric acid and 4,4′-dipyridylamine (dpa) has afforded an isostructural family of coordination polymers with formulation [M(glu)(dpa)]n (M=Co (1), Ni (2), Cu (3); glu=glutarate). Square pyramidal coordination is seen in 1–3, with semi-ligation of a sixth donor to produce a “5+1” extended coordination sphere. Neighboring metal atoms are linked into 1D [M(glu)]n neutral chains through chelating/monodentate bridging glutarate moieties with a syn–anti binding mode, and semi-chelation of the pendant carboxylate oxygen. These chains further connect into 2D layers through dipodal dpa ligands. Neighboring layers stack into the pseudo 3D crystal structure of 1–3 through supramolecular hydrogen bonding between dpa amine units and the semi-chelated glutarate oxygen atoms. The variable temperature magnetic behavior of 1–3 was explored and modeled as infinite 1D Heisenberg chains. Notably, complex 3 undergoes a thermally induced single crystal-to-single crystal transformation between centric and acentric space groups, with a conformationally disordered unilayer structure at 293 K and an ordered bilayer structure at 173 K. All materials were further characterized via infrared spectroscopy and elemental and thermogravimetric analyses.
Ronald M Supkowski - One of the best experts on this subject based on the ideXlab platform.
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synthesis crystal structure and magnetic properties of two dimensional divalent metal glutarate dipyridylamine coordination polymers with a single crystal to single crystal transformation in the Copper Derivative
Journal of Solid State Chemistry, 2009Co-Authors: Matthew R Montney, Ronald M Supkowski, Richard J Staples, Robert L LaducaAbstract:Abstract Hydrothermal reaction of divalent metal chlorides with glutaric acid and 4,4′-dipyridylamine (dpa) has afforded an isostructural family of coordination polymers with formulation [M(glu)(dpa)]n (M=Co (1), Ni (2), Cu (3); glu=glutarate). Square pyramidal coordination is seen in 1–3, with semi-ligation of a sixth donor to produce a “5+1” extended coordination sphere. Neighboring metal atoms are linked into 1D [M(glu)]n neutral chains through chelating/monodentate bridging glutarate moieties with a syn–anti binding mode, and semi-chelation of the pendant carboxylate oxygen. These chains further connect into 2D layers through dipodal dpa ligands. Neighboring layers stack into the pseudo 3D crystal structure of 1–3 through supramolecular hydrogen bonding between dpa amine units and the semi-chelated glutarate oxygen atoms. The variable temperature magnetic behavior of 1–3 was explored and modeled as infinite 1D Heisenberg chains. Notably, complex 3 undergoes a thermally induced single crystal-to-single crystal transformation between centric and acentric space groups, with a conformationally disordered unilayer structure at 293 K and an ordered bilayer structure at 173 K. All materials were further characterized via infrared spectroscopy and elemental and thermogravimetric analyses.
Richard J Staples - One of the best experts on this subject based on the ideXlab platform.
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synthesis crystal structure and magnetic properties of two dimensional divalent metal glutarate dipyridylamine coordination polymers with a single crystal to single crystal transformation in the Copper Derivative
Journal of Solid State Chemistry, 2009Co-Authors: Matthew R Montney, Ronald M Supkowski, Richard J Staples, Robert L LaducaAbstract:Abstract Hydrothermal reaction of divalent metal chlorides with glutaric acid and 4,4′-dipyridylamine (dpa) has afforded an isostructural family of coordination polymers with formulation [M(glu)(dpa)]n (M=Co (1), Ni (2), Cu (3); glu=glutarate). Square pyramidal coordination is seen in 1–3, with semi-ligation of a sixth donor to produce a “5+1” extended coordination sphere. Neighboring metal atoms are linked into 1D [M(glu)]n neutral chains through chelating/monodentate bridging glutarate moieties with a syn–anti binding mode, and semi-chelation of the pendant carboxylate oxygen. These chains further connect into 2D layers through dipodal dpa ligands. Neighboring layers stack into the pseudo 3D crystal structure of 1–3 through supramolecular hydrogen bonding between dpa amine units and the semi-chelated glutarate oxygen atoms. The variable temperature magnetic behavior of 1–3 was explored and modeled as infinite 1D Heisenberg chains. Notably, complex 3 undergoes a thermally induced single crystal-to-single crystal transformation between centric and acentric space groups, with a conformationally disordered unilayer structure at 293 K and an ordered bilayer structure at 173 K. All materials were further characterized via infrared spectroscopy and elemental and thermogravimetric analyses.
Glauco Sbrana - One of the best experts on this subject based on the ideXlab platform.
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selective synthesis of isobutanol by means of the guerbet reaction part 1 methanol n propanol condensation by using Copper based catalytic systems
Journal of Molecular Catalysis A-chemical, 2003Co-Authors: Carlo Carlini, Marco Di Girolamo, M Marchionna, Marilena Noviello, Anna Maria Raspolli Galletti, Glauco SbranaAbstract:Abstract The synthesis of isobutanol ( i BuOH ) from mixtures of methanol (MeOH) and n -propanol (PrOH), via the Guerbet reaction, has been studied. Heterogeneous Copper based catalytic systems, in combination with soluble sodium methoxide (MeONa) as basic component, were employed. In particular, Copper-Raney and Copper chromite were tested as metal components. The effect of the relative amount of MeONa with respect to the Copper component as well as of PrOH was investigated. The influence of reaction parameters such as temperature, reaction environment (type of gas and its pressure) and composition of the MeOH/PrOH mixture used as feed was also evaluated. In all cases, independently from the type of Copper Derivative used, the selectivity to i BuOH was nearly complete. Moreover, an increase of the temperature in the 180–220 °C range caused a remarkable improvement of PrOH conversion and productivity to i BuOH . The replacement of H 2 atmosphere by N 2 caused a significant improvement of catalyst productivity. When the experiments were performed under CO/H 2 atmosphere the catalyst activity was similar to that obtained under H 2 . The catalysts based on Copper chromite showed, under the same reaction conditions, higher activities (about one order of magnitude) as compared with those obtained by using Copper-Raney based catalysts.