Biography

Ph.D and Postdoctoral Opportunities

To discuss possibilities for self-funded studentships, or post-doctoral fellowship applications please do not hesitate to contact me.

Biography

Dr. Fielden completed his MSci in Chemistry at the University of Bristol in 2000, before moving to the University of Glasgow where he graduated with a Ph.D in 2005 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, and was promoted to Senior Lecturer in 2018.

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. Since joining UEA the main focus of his work has been the study of arylimido-polyoxometalates (a-POMs) as non-linear optical chromophores, and as sensitisers and coadsorbents for the p-type dye-sensitised solar cell, both applications making use of the POM's properties as an electron acceptor. He is also working to develop luminescent sensors for i-motif DNA with Dr Zoë Waller (formerly UEA, now UCL School of Pharmacy). To see a YouTube video about this work, click here.

Click here to go to the Energy Materials Laboratory homepage.

Selected Publications

Philip Spence, John Fielden and Zoë A. E. Waller
Beyond Solvent Exclusion: i-Motif Detecting Capability and An Alternative DNA Light-Switching Mechanism in a Ruthenium(II) Polypyridyl Complex
J. Am. Chem. Soc. 2020, 14213856-13866. 
DOI:
 10.1021/jacs0c04789. Click here to check out Zo
ë's YouTube video.

Simon N. Child, Radoslav Raychev, Nathan Moss, Benjamin Howchen, Peter N. Horton, Christopher C. Prior, Vasily S. Oganesyan and John Fielden.
Cobalt-based molecular electrocatalysis of nitrile reduction: evolving sustainability beyond hydrogen.
Dalton. Trans. 2019, 48, 9576-9580. Contribution to sustainability theme of d-block chemistry special issue and highlighted by ChemistryViews.
DOI:
 10.1039/c9dt00773c

Ahmed Al-Yasari, Philip Spence, Hani El Moll, Nick Van Steerteghem, Peter N. Horton, Bruce S. Brunschwig, Koen Clays and John Fielden.
Fine-tuning Polyoxometalate Non-Linear Optical Chromophores: A Molecular Electronic "Goldilocks" Effect.
Dalton. Trans. 2018, 4710415-10419. Inside front cover of New Talent Europe special issue.
DOI:
 10.1039/c8dt01491d

Ahmed Al-Yasari, Nick Van Steerteghem, Hayleigh Kearns, Hani El Moll, Karen Faulds, Joseph A. Wright, Bruce S. Brunschwig, Koen Clays and John Fielden.
Organoimido-Polyoxometalate Non-Linear Optical Chromophores: A Structural, Spectroscopic and Computational Study
Inorg. Chem. 2017, 56, 10181-10194.
DOI:
 10.1021/acs.inorgchem.7b00708

Hani El Moll, Fiona A. Black, Christopher J. Wood, Ahmed Al-Yasari, Anil Reddy Marri, Igor V. Sazanovich, Elizabeth A. Gibson and John Fielden. 
Increasing p-type dye sensitised solar cell photovoltages using polyoxometalates
Phys. Chem. Chem. Phys. 2017, 19, 18831-18835.
DOI:
 10.1039/C7CP01558E

Ahmed Al-Yasari, Nick Van Steerteghem, Hani El Moll, Koen Clays and John Fielden.
Donor-Acceptor Organo-Imido Polyoxometalates: High Transparency, High Activity Redox-Active NLO Chromophores
Dalton. Trans. 201645, 2818-2822.
DOI:
 10.1039/C6DT00115G

John Fielden, Jordan M. Sumliner, Nannan Han, Yurii Gueletii, Xu Xiang, Djamaladdin G. Musaev, Tianquan Lian, and Craig L. Hill.
Water Splitting with Polyoxometalate-Treated Photoanodes: Enhancing Performance through Sensitizer Design
Chem. Sci. 20156, 5531-5543.
DOI:
10.1039/C5SC01439E

Elliot N. Glass, John Fielden, Alexey L. Kaledin, Djamaladdin G. Musaev, Tianquan Lian, and Craig L. Hill.
Extending Metal-to-Polyoxometalate Charge Transfer Lifetimes: The Effect of Heterometal Location
Chem. Eur. J. 201420, 4297–4307.
DOI:
10.1002/chem.201304119 

 

 

Career

  • 2012 – Lecturer in Energy Materials, UEA School of Chemistry (confirmed spring 2016)
  • 2010 – 2013 Marie Curie International Outgoing Fellow, Emory University (Atlanta, USA) and UEA
  • 2007 – 2010 Post-Doctoral Research Associate, University of Manchester
  • 2005 – 2006 Post-Doctoral Research Associate, Ames Laboratory (US Department of Energy)
  • 2001 – 2004 Ph.D in Inorganic Chemistry, University of Glasgow
  • 1996 – 2000 MSci in Chemistry, University of Bristol

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