Ward, Mike D. - University of Sheffield

个人简介

Prof. Ward obtained a BA in Chemistry from the University of Cambridge in 1986. This was followed by a PhD from the same institution in 1989, after which he became a postdoctoral research associate at the Université Louis Pasteur de Strasbourg. In 1990 he was appointed as Lecturer at the University of Bristol, where he was subsequently promoted to Reader and Professor. In 2003 he was appointed as professor of Inorganic Chemistry at the University of Sheffield. He was Head of Department of Chemistry from 2007 to 2011 and again from 2015 onwards.

研究领域

My research interests cover all aspects of the preparation, structural characterisation, and physical properties (electrochemical, magnetic, optical and photophysical) of complexes based on transition-metal (d-block) and lanthanide (f-block) elements. As such the work is interdisciplinary and covers many aspects of inorganic, organic, physical and materials chemistry. Currently active areas of interest include the following. Self-assembly and host-guest chemistry of supramolecular cage complexes. Reaction of relatively simple bridging ligands with labile first-row transition metal ions can afford remarkably elaborate high-nuclearity cage complexes which bind anionic guests in their central cavity. In some cases the central anions act as templates to induce the assembly of the cage around them. The largest example we have characterised so far is a tetra-capped, truncated tetrahedral cage containing sixteen Zn(II) ions, twenty four bridging ligands, and thirty two anion. Such cage complexes are of interest not only for their structures but also for their host-guest chemistry associated with anion uptake into their central cavities, and their photophysical properties. Photophysical properties of polynuclear assemblies. MDW fig 2 Complexes in which a light-absorbing group with a long excited-state lifetime (commonly, a Ru(II)-polypyridyl unit) is attached to a metal fragment which can use the excited-state energy, either in a redox reaction or by accepting it to enter an excited state of its own, are of particular interest in a variety of fields ranging from solar energy harvesting, luminescent cellular probes, and display devices. Particular emphases at the moment are on: (i) the use of transition metal compleses as chromophores to sensitise luminescence from lanthanides in mixed d/f complexes; this can lead to two-component (blue and red) luminescence which combines to give white light from a single molecule (see Figure); (ii) use of luminescent cyanometallate complexes such as [Ru(bipy)(CN)4]2- as components of supramolecular assemblies via participation of the cyanide units in coordination to other metal ions, or hydrogen- or halogen- bonding; (iii) Use of picosecond time-resolved infra-red spectroscopy to understand photoinduced energy and electron transfer in polynuclear assemblies.

近期论文

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Gong DP, Gao TB, Cao DK & Ward MD (2016) Cyclometalated Ir(iii) complexes containing quinoline-benzimidazole-based N^N ancillary ligands: structural and luminescence modulation by varying the substituent groups or the protonation/deprotonation state of imidazole units.. Dalton Trans. Metherell AJ, Curty C, Zaugg A, Saad ST, Dennison GH & Ward MD (2016) Converting an intensity-based sensor to a ratiometric sensor: luminescence colour switching of an Ir/Eu dyad upon binding of a V-series chemical warfare agent simulant. Journal of Materials Chemistry C, 4(41), 9664-9668. View this article in WRRO Metherell AJ & Ward MD (2016) Geometric isomerism in coordination cages based on tris-chelate vertices: a tool to control both assembly and host/guest chemistry.. Dalton Trans. View this article in WRRO Gong DP, Gao TB, Cao DK & Ward MD (2016) Bisthienylethenes containing an imidazole bridge unit and their Ir(III) complexes: Influence of substituent groups on photochromism and luminescence. RSC Advances, 6(74), 69677-69684. Saad ST, Metherell AJ, Baggaley E & Ward MD (2016) Synthesis and photophysical properties of Ir( iii )/Re( i ) dyads: control of Ir→Re photoinduced energy transfer. Dalton Transactions, 45(28), 11568-11579. View this article in WRRO Jana A, Crowston BJ, Shewring JR, McKenzie LK, Bryant HE, Botchway SW, Ward AD, Amoroso AJ, Baggaley E & Ward MD (2016) Heteronuclear Ir(III)–Ln(III) Luminescent Complexes: Small-Molecule Probes for Dual Modal Imaging and Oxygen Sensing. Inorganic Chemistry, 55(11), 5623-5633. View this article in WRRO Taylor CGP, Piper JR & Ward MD (2016) Binding of chemical warfare agent simulants as guests in a coordination cage: contributions to binding and a fluorescence-based response. Chem. Commun., 52(37), 6225-6228. View this article in WRRO Metherell AJ & Ward MD (2016) Imposing control on self-assembly: rational design and synthesis of a mixed-metal, mixed-ligand coordination cage containing four types of component. Chem. Sci., 7(2), 910-915. View this article in WRRO