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Showing papers by "Cameron J. Kepert published in 2003"

Journal Article•DOI•
Reversible guest exchange and ferrimagnetism (T(C) = 60.5 K) in a porous cobalt(II)-hydroxide layer structure pillared with trans-1,4-cyclohexanedicarboxylate.

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Mohamedally Kurmoo1, Hitoshi Kumagai1, Suzanne Hughes1, Cameron J. Kepert1•
University of Sydney1
25 Sep 2003-Inorganic Chemistry
TL;DR: Variation of the pillar and of the guest-exchange chemistry, including the exchange of magnetic guests such as O(2), offers the possibility of tailoring the magnetic properties of this material.
Abstract: The synthesis, characterization, and reversible guest-exchange chemistry of a new porous magnetic material that orders ferrimagnetically at 60.5 K are described. The material, Co5(OH)8(chdc)·4H2O (chdc = trans-1,4-cyclohexanedicarboxylate), contains tetrahedral−octahedral−tetrahedral Co(II)−hydroxide layers of composition Co(oct)3Co(tet)2(OH)8 that are linked together by bis(unidentate) chdc pillars. Noncoordinated water molecules occupy 1-D channels situated between the chdc pillars. The material remains monocrystalline during dehydration from Co5(OH)8(chdc)·4H2O (CDCC·4H2O) to Co5(OH)8(chdc) (CDCC) via an intermediate Co5(OH)8(chdc)·2H2O (CDCC·2H2O) upon heating or evacuation. In-situ single crystal and powder X-ray diffraction analyses indicate that the interlayer spacing decreases in two steps, each corresponding to the loss of two water molecules per formula unit as determined by thermogravimetry. The single crystal structure of the fully dehydrated material, CDCC, has no void volume due to a tilting...

210 citations

Journal Article•DOI•
Binary metal(II)–pyromellitate coordination polymers, M 2 (pm) (M=Co, Fe, Mn): synthesis, structures and magnetic properties

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Hitoshi Kumagai, Karena W. Chapman1, Cameron J. Kepert1, Mohamedally Kurmoo•
University of Sydney1
15 Jul 2003-Polyhedron
TL;DR: In this article, the magnetic properties of isostructural coordination polymers are described, where each ligand participates in an unprecedented 12 coordination M O bonds to ten metal atoms.

35 citations

Patent•
Anomalous expansion materials

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Cameron J. Kepert1, Andrew L. Goodwin•
University of Sydney1
04 Jul 2003
TL;DR: In this paper, a method for controlling the thermal expansion behavior of a material comprises the step of incorporating into the material a component including one or more diatomic bridges, where each diatomic bridge extends between two atoms in the component.
Abstract: A method for controlling the thermal expansion behaviour of a material comprises the step of incorporating into the material a component including one or more diatomic bridges. The or each diatomic bridge extends between two atoms in the component. The method is characterised in that the or each diatomic bridge has at least one vibrational mode that causes the two atoms on either side of the bridge to be moved together to a similar or greater extent than competing vibrational mode(s) that cause the two atoms on either side of the bridge to be moved apart. The bridge may also be polyatomic. New materials and devices comprising a plurality of such diatomic and polyatomic bridges are also defined.