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Start Over Author "Dag Noréus" Journal journal of the american chemical society
4 results on '"Dag Noréus"'

1. Two New Cluster Ions, Ga[GaH3]45– with a Neopentane Structure in Rb8Ga5H15 and [GaH2]nn– with a Polyethylene Structure in Rbn(GaH2)n, Represent a New Class of Compounds with Direct Ga–Ga Bonds Mimicking Common Hydrocarbons

Author

Samantha K. Callear, Bjørn C. Hauback, William I. F. David, Henrik Fahlquist, and Dag Noréus

Subjects
chemistry.chemical_classification, Neutron powder diffraction, Hydride, chemistry.chemical_element, General Chemistry, Polyethylene, Biochemistry, Catalysis, Ion, Crystallography, chemistry.chemical_compound, Colloid and Surface Chemistry, Hydrocarbon, chemistry, Neopentane, Cluster (physics), Gallium
Abstract

The first examples of a new class of gallium hydride clusters with direct Ga-Ga bonds and common hydrocarbon structures are reported. Neutron powder diffraction was used to find a Ga[GaH(3)](4)(5-) ...

Published
2011
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2. A Novel Tetrahedral Formally Zerovalent-Palladium Hydrido Complex Stabilized by Divalent Alkaline Earth Counterions

Author

Dag Noréus, Mikael Kritikos, and Malin Olofsson-Mårtensson

Subjects
chemistry.chemical_classification, Electron density, Alkaline earth metal, Ligand, Inorganic chemistry, chemistry.chemical_element, General Chemistry, Biochemistry, Catalysis, Divalent, Crystallography, Colloid and Surface Chemistry, chemistry, Atomic orbital, Tetrahedron, Counterion, Palladium
Abstract

To investigate how formally low-valent transition-metal hydrido complexes are stabilized without the conventional “back-donation mechanism” of electron density to ligand orbitals, a new tetrahedral...

Published
1999
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3. Two new cluster ions, Ga[GaH3]4(5-) with a neopentane structure in Rb8Ga5H15 and [GaH2]n(n-) with a polyethylene structure in Rb(n)(GaH2)n, represent a new class of compounds with direct Ga-Ga bonds mimicking common hydrocarbons

Author

Henrik, Fahlquist, Dag, Noréus, Samantha, Callear, William I F, David, and Björn C, Hauback

Abstract

The first examples of a new class of gallium hydride clusters with direct Ga-Ga bonds and common hydrocarbon structures are reported. Neutron powder diffraction was used to find a Ga[GaH(3)](4)(5-) cluster ion with a neopentane structure in a novel cubic structure type of Rb(8)Ga(5)H(15). Another cluster ion with a polyethylene structure, [GaH(2)](n)(n-), was found in a second novel (RbGaH(2))(n) hydride. These hydrocarbon-like clusters in gallium hydride materials have significant implications for the discovery of hydrides for hydrogen storage as well as for interesting electronic properties.

Published
2011

4. Polyanionic hydrides from polar intermetallics AeE2 (Ae = Ca, Sr, Ba; E = Al, Ga, In)

Author

Dag Noréus, Ulrich Häussermann, and Thomas Björling

Subjects
Stereochemistry, Neutron diffraction, Intermetallic, General Chemistry, Electronic structure, Aluminium hydride, Biochemistry, Catalysis, Crystallography, chemistry.chemical_compound, Colloid and Surface Chemistry, chemistry, Ternary compound, Ab initio quantum chemistry methods, Isostructural, Powder diffraction
Abstract

The hydrogenation behavior of the polar intermetallic systems AeE2 (Ae = Ca, Sr, Ba; E = Al, Ga, In) has been investigated systematically and afforded the new hydrides SrGa2H2 and BaGa2H2. The structure of these hydrides was characterized by X-ray powder diffraction and neutron diffraction of the corresponding deuterides. Both compounds are isostructural to previously discovered SrAl2H2 (space group P3m1, Z = 1, SrGa2H2/D2: a = 4.4010(4)/4.3932(8) A, c = 4.7109(4)/4.699(1) A; BaGa2H2/D2: a = 4.5334(6)/4.5286(5) A, c = 4.9069(9)/4.8991(9) A). The three hydrides SrAl2H2, SrGa2H2, and BaGa2H2 decompose at around 300 degrees C at atmospheric pressure. First-principles electronic structure calculations reveal that H is unambiguously part of a two-dimensional polyanion [E2H2]2- in which each E atom is tetrahedrally coordinated by three additional E atoms and H. The compounds AeE2H2 are classified as polyanionic hydrides. The peculiar feature of polyanionic hydrides is the incorporation of H in a polymeric anion where it acts as a terminating ligand. Polyanionic hydrides provide unprecedented arrangements with both E-E and E-H bonds. The hydrogenation of AeE2 to AeE2H2 takes place at low reaction temperatures (around 200 degrees C), which suggests that the polyanion of the polar intermetallics ([E2]2-) is employed as precursor.

Published
2006

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