David Keen: Publications

Pressure-induced phase transitions in chromium thiospinels

Physical Review B American Physical Society (APS) 63:6 (2001) 064106

Authors:

P Vaqueiro, AV Powell, S Hull, DA Keen

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Dynamic structural disorder in cristobalite: neutron total scattering measurement and reverse Monte Carlo modelling

Journal of Physics Condensed Matter IOP Publishing 13:3 (2001) 403

Authors:

Matthew G Tucker, Matthew P Squires, Martin T Dove, David A Keen

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The molecular structure of (PSH+)(nido-7,8-C2B9H12-) determined by neutron diffraction (PS = proton sponge, 1,8-bis(dimethylamino)naphthalene).

Inorganic chemistry 40:1 (2001) 173-175

Authors:

MA Fox, AE Goeta, JA Howard, AK Hughes, AL Johnson, DA Keen, K Wade, CC Wilson

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Simultaneous analysis of changes in long-range and short-range structural order at the displacive phase transition in quartz

Journal of Physics Condensed Matter IOP Publishing 12:48 (2000) l723

Authors:

Matthew G Tucker, Martin T Dove, David A Keen

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Halogen trimer synthons in crystal engineering: low-temperature X-ray and neutron diffraction study of the 1:1 complex of 2,4, 6-tris(4-chlorophenoxy)-1,3,5-triazine with tribromobenzene

Acta crystallographica. Section B, Structural science 56 (Pt 6) (2000) 1080-1084

Authors:

CK Broder, JA Howard, DA Keen, CC Wilson, FH Allen, RK Jetti, A Nangia, GR Desiraju

Abstract:

The title complex has been studied using low-temperature X-ray (150 K) and neutron (100 K) diffraction. Molecules of the triazine host form a two-dimensional hexagonal network mediated by trigonally symmetric Cl(3) synthons having Cl.Cl interactions of 3.441 (3) A, a C-Cl.Cl angle of 165 degrees and a Cl.Cl-C angle of 105 degrees, close to the ideal values of 180 and 90 degrees, respectively. The guest molecules are of an appropriate size to fit the hexagonal networks and interact with the host via C-H.pi (phenyl) and C-Br.pi (phenyl) interactions which stabilize the overall structure. Both C-donor bond vectors are directed more closely towards the mid-point (X) of an individual aromatic bond, rather than the ring centroid, with H.X 2.817 (9) A and C-H.X 174.0 (9) degrees, and Br.X 3.353 (4) A and C-Br.X 158.1 (2) degrees.

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David Keen

Sub department

Pressure-induced phase transitions in chromium thiospinels

Authors:

Dynamic structural disorder in cristobalite: neutron total scattering measurement and reverse Monte Carlo modelling

Authors:

The molecular structure of (PSH+)(nido-7,8-C2B9H12-) determined by neutron diffraction (PS = proton sponge, 1,8-bis(dimethylamino)naphthalene).

Authors:

Simultaneous analysis of changes in long-range and short-range structural order at the displacive phase transition in quartz

Authors:

Halogen trimer synthons in crystal engineering: low-temperature X-ray and neutron diffraction study of the 1:1 complex of 2,4, 6-tris(4-chlorophenoxy)-1,3,5-triazine with tribromobenzene

Authors:

Abstract:

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Pressure-induced phase transitions in chromium thiospinels

Authors:

Dynamic structural disorder in cristobalite: neutron total scattering measurement and reverse Monte Carlo modelling

Authors:

The molecular structure of (PSH+)(nido-7,8-C2B9H12-) determined by neutron diffraction (PS = proton sponge, 1,8-bis(dimethylamino)naphthalene).

Authors:

Simultaneous analysis of changes in long-range and short-range structural order at the displacive phase transition in quartz

Authors:

Halogen trimer synthons in crystal engineering: low-temperature X-ray and neutron diffraction study of the 1:1 complex of 2,4, 6-tris(4-chlorophenoxy)-1,3,5-triazine with tribromobenzene

Authors:

Abstract: