Fielden, John - University of East Anglia

个人简介

Dr. Fielden completed his MSci in Chemistry at the University of Bristol in 2000, before moving to the University of Glasgow to study for his Ph.D (2004) under the supervision of Prof. Leroy Cronin. He then spent two years working with Prof. Paul Kögerler at Ames Laboratory (Iowa State University) on the self-assembly and properties of polyoxometalates (POMs) and chiral magnetic materials. In 2007 he took up a postdoctoral position with Dr. Benjamin Coe at the University of Manchester, investigating redox-switchable NLO chromophores, and in 2010 was awarded a Marie Curie International Outgoing Fellowship. This took him back across the Atlantic to the laboratory of Prof. Craig Hill at Emory University, where he worked on POM functionalized photoelectrodes and the excited state properties of transition metal substituted POMs. He joined the UEA as a lecturer in 2012, transferring his Marie Curie reintegration year from Glasgow. John is interested in the synthesis and optical and photophysical properties of coordination compounds and clusters, particularly relating to solar energy conversion and non-linear optics. In particular, he aims to devise ways of efficiently exploiting the properties of POMs as catalysts and electron acceptors in light-driven chemistry. Current projects include synthesis of POM-containing electro-polymer photocathodes, investigation of metallo-organic POM hybrids as photosensitizers, and multi-component catalytic arrays based on tripodal ligand systems. He also plans to extend the fundamental coordination chemistry of multi-molybdenum and tungsten clusters, and develop supramolecular recognition strategies that can be used to control the self-assembly of functional POM-based nanostructures.

研究领域

Polyoxometalate-based non-linear optical chromophores and electropolymers (collaboration with Prof. Chris Pickett). We have recently obtained a series of donor-acceptor chromophores based on polyoxometalates, including systems based on electropolymerizable pyrrole units. The resulting materials are being tested as electrochemically controlled optical switches. (Students: Ph.D – Ahmed Al-Yasari, MChem Phil Spence). Multi-component catalytic arrays: We are using small, heteroleptic tripodal ligands as a platform to build multifunctional arrays for small molecule activation. The ligands can coordinate a transition metal in a bidentate or tetradentate coordination pocket, while providing a pendant group for introduction of proton or electron relays. These will allow controlled study of secondary coordination sphere effects, and incorporation of redox active groups in the secondary sphere. (Students: Ph.D – Simon Child, MChem David Miko). POM-derivatives as photosensitizers: We are investigating the use of POMs as electron acceptor units in push-pull chromophores. These are designed to improve the efficiency of p-type dye-sensitized solar cells by retarding recombination of photo-excited electrons to NiO, one of the major sources of inefficiencies in these systems. PDRA: Dr. Hani El-Moll New p-type semiconductor nanomaterials: we are investigating replacement of NiO in the p-type DSSC, a key imperative to improve performance, in collaboration with Dr. Andrew Mayes (Student: MChem, Natalia Sanchez Moreno).

近期论文

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Al-Yasari, A., Van Steerteghem, N., El Moll, H., Clays, K., Fielden, J.(2016)Donor–acceptor organo-imido polyoxometalates: high transparency, high activity redox-active NLO chromophoresin Dalton Transactions45.pp. 2818-2822 Full Text UEA Repository(Article) Glass, E., Fielden, J., Huang, Z., Xiang, X., Musaev, D., Lian, T., Hill, C.(2016)Transition Metal Substitution Effects on Metal-to-Polyoxometalate Charge Transferin Inorganic Chemistry55.pp. 4308-4319 Full Text UEA Repository(Article) Fielden, J., Sumliner, J. M., Han, N., Geletii, Y., Xiang, X., Musaev, D. G., Lian, T., Hll, C. L.(2015)Water Splitting with Polyoxometalate-Treated Photoanodes: Enhancing Performance through Sensitizer Designin Chemical Science6.pp. 5531-5543 Full Text UEA Repository(Article) Glass, E. N., Fielden, J., Kaledin, A. L., Musaev, D. G., Lian, T., Hill, C. L.(2014)Extending Metal-to-Polyoxometalate Charge Transfer Lifetimes: The Effect of Heterometal Locationin Chemistry - A European Journal20.pp. 4297-4307 Full Text UEA Repository(Article) Tang, Y., He, W., Lu, Y., Fielden, J., Xiang, X., Yan, D.(2014)Assembly of ruthenium-based complex into metal-organic framework with tunable area-selected luminescence and enhanced photon-to-electron conversion efficiencyin The Journal of Physical Chemistry C118.pp. 25365-25373 Full Text UEA Repository(Article) Sumliner, J. M., Lv, H., Fielden, J., Geletii, Y. V., Hill, C. L.(2014)Polyoxometalate multi-electron-transfer catalytic systems for water splittingin European Journal of Inorganic Chemistry2014.pp. 635-644 Full Text UEA Repository(Article) Al-Yasari, A., Fielden, J.(2014)Polyoxometalates in visible-light photocatalysis and solar energy conversionin Reviews in Advanced Science and Engineering3.pp. 304-319 Full Text UEA Repository(Article) Xiang, X., Fielden, J., Rodríguez-Córdoba, W., Huang, Z., Zhang, N., Luo, Z., Musaev, D., Lian, T., Hill, C.(2013)Electron transfer dynamics in semiconductor–chromophore–polyoxometalate catalyst photoanodesin The Journal of Physical Chemistry C117.pp. 918-926 Full Text UEA Repository(Article) Fielden, J., Long, D., Speldrich, M., Kögerler, P., Cronin, L.(2012)[CoxCu1−x(DDOP)(OH2)(NO3)](NO3): hydrogen bond-driven distortion of cobalt(ii) by solid solution ‘network mismatch’in Dalton Transactions41.pp. 4927-4934 Full Text UEA Repository(Article) Fielden, J., Quasdorf, K., Cronin, L., Kögerler, P.(2012)A fluorophosphate-based inverse Keggin structurein Dalton Transactions41.pp. 9876-9878 Full Text UEA Repository(Article) Fielden, J., Speldrich, M., Besson, C., Kögerler, P.(2012)Chiral Hexanuclear Ferric Wheelsin Inorganic Chemistry51.pp. 2734-2736 Full Text UEA Repository(Article) Tennant, D., Lake, B., James, A., Essler, F., Notbohm, S., Mikeska, H., Fielden, J., Kögerler, P., Canfield, P., Telling, M.(2012)Anomalous dynamical line shapes in a quantum magnet at finite temperaturein Physical Review B85.pp. 014402-014413 Full Text UEA Repository(Article) Coe, B., Fielden, J., Foxon, S., Asselberghs, I., Clays, K., Van Cleuvenbergen, S., Brunschwig, B.(2011)Ferrocenyl Diquat Derivatives: Nonlinear Optical Activity, Multiple Redox States, and Unusual Reactivityin Organometallics30.pp. 5731-5743 Full Text UEA Repository(Article) Blackburn, O., Coe, B., Fielden, J., Helliwell, M., McDouall, J., Hutchings, M.(2010)Nickel(II) and Palladium(II) Complexes of Azobenzene-Containing Ligands as Dichroic Dyesin Inorganic Chemistry49.pp. 9136-9150 Full Text UEA Repository(Article) Clays, K., Docherty, R., Fielden, J., Helliwell, M., Raftery, J., Shaw, R., Swanson, C., Coe, B.(2010)Designing organic molecules for terahertz radiation generation in robust crystals Full Text UEA Repository(Paper)Coe, B., Fielden, J., Foxon, S., Asselberghs, I., Clays, K., Brunschwig, B.(2010)Two-Dimensional, Pyrazine-Based Nonlinear Optical Chromophores with Ruthenium(II) Ammine Electron Donorsin Inorganic Chemistry49.pp. 10718-10726 Full Text UEA Repository(Article) Coe, B., Fielden, J., Foxon, S., Brunschwig, B., Asselberghs, I., Clays, K., Samoc, A., Samoc, M.(2010)Combining Very Large Quadratic and Cubic Nonlinear Optical Responses in Extended, Tris-Chelate Metallochromophores with Six π-Conjugated Pyridinium Substituentsin Journal of the American Chemical Society132.pp. 3496-3513 Full Text UEA Repository(Article) Coe, B., Fielden, J., Foxon, S., Harris, J., Helliwell, M., Brunschwig, B., Asselberghs, I., Clays, K., Garín, J., Orduna, J.(2010)Diquat Derivatives: Highly Active, Two-Dimensional Nonlinear Optical Chromophores with Potential Redox Switchabilityin Journal of the American Chemical Society132.pp. 10498-10512 Full Text UEA Repository(Article) Coe, B., Fielden, J., Foxon, S., Helliwell, M., Asselberghs, I., Clays, K., De Mey, K., Brunschwig, B.(2010)Syntheses and Properties of Two-Dimensional, Dicationic Nonlinear Optical Chromophores Based on Pyrazinyl Coresin The Journal of Organic Chemistry75.pp. 8550-8563 Full Text UEA Repository(Article) Coe, B., Fielden, J., Foxon, S., Helliwell, M., Brunschwig, B., Asselberghs, I., Clays, K., Olesiak, J., Matczyszyn, K., Samoc, M.(2010)Quadratic and Cubic Nonlinear Optical Properties of Salts of Diquat-Based Chromophores with Diphenylamino Substituentsin The Journal of Physical Chemistry A114.pp. 12028-12041 Full Text UEA Repository(Article)