Research Interests

Although I am not employed by the University to conduct formal research I have retained my interest in Theoretical Chemistry for which I was awarded a PhD.  In my day to day job I have the luxury of discussing Chemistry with colleagues as well as keeping abreast of some of the latest developments in the field.

My own academic interest is the study of Dispersion forces and Exchange potentials.  These are particularly relevant in calculating the physical properties of Molecular Crystals such as sublimation energies and packing arrangements.  They are very important in determining the conformation of molecules and calculating the binding energies of compounds at drug receptor sites.

More recently I have been performing NMR Ring Current calculations on various congregate aromatic systems.  This is an application of Graph Theory.   Another application of which that has long fascinated me, is proving non repetition changes in Bell ringing.  Sadly the use of Graph Theory in proving whether a peal is true is in decline as “brute force” computer simulation techniques have become more prevalent.

Prior to joining the University I was at GSK for 24 years.  In the early part of my career I worked in as a Chemist in molecular computer graphics.  Later my career evolved into IT infrastructure management.  I also provide external research degree supervision.  Current themes include Six Sigma process improvement methodology.

Teaching

I am an Official Fellow, College Lecture and Director of Studies in Chemistry at Peterhouse .  I supervise the Part IA Chemistry course for all students taking this subject at Peterhouse.  This covers:

1. Shapes and Structures of Molecules - encompassing NMR and IR spectroscopy as well as Quantum Mechanics

2. Reactions and mechanisms in organic chemistry - Nucleophilic Substitution, Electrophilic attack on pi-bonds, carbonyl chemistry.

3. Energetics and Equilibria - Second Law of Thermodynamics entropy, enthalpy, Gibbs energy

4. Kinetics of Chemical Reactions - Reaction rates and rate laws.

5. Chemistry of the Elements - Properties and electronic structure.  Chemical bonding and reactions.

I also organise supervisions for students in subsequent years and support students who pursue Chemistry at Cambridge.

lMy supervising goal is to ensure that all students taking Chemistry at Peterhouse understand the material covered in lectures.  Can answer the problems sheets set and become prepared to sit the IA Tripos exam.

I also supervise Part IB-B (Second Year) Inorganic Chemistry.  Topics include:

1. Co-ordination chemistry with a special focus on first row transition metals, isomerism, oxidation states, Crystal Field Theory, d orbital splitting, high and low spin complexes and magnetic properties of transition metal ions.

2. Organometalic chemistry including the 18 electron rule, metal carbonyl structures, sandwich complexes, oxidation state and ligand stability, homogenous catalysis.

3. Main Group ring Chemistry.  Various ring main group ring systems will be explored including systems with B/N, P/N and S.N rings.  Alternative bonding models to covalent bonding will be examined such as negative hyperconjugation with ionic bonding.

I am  passionate about helping other people with their personal development and currently provide mentoring support to several people within the School of Physical Science.

Publications

Selected papers:

A.T. Balaban, T.K. Dickens, I. Gutman, R.B. Mallion, "Ring Currents and the PCP Rule", Croatica Chemica Acta, 83 (2) 209-215 (2010) PDF

By this paper I have an Erdös number of 3 with a multiplicity of 3 as all three co-authors have an Erdös number of 2 which incidentally they have acquired several times over.

T.K. Dickens*, R.B. Mallion, “Topological Ring-Currents in the ‘Empty’ Ring of Benzo-Annelated Perylenes”, J Chem Phys A.- 115 351–356 (2011). DOI: 10.1021/jp1096103

T.K. Dickens*, J.A.N.F. Gomes, R.B Mallion "Some Comments on Topological Approaches to the π-Electron Currents in Conjugated Systems" J Chem Theory and Comp. - 7 3661-3674 (2011). DOI: 10.1021/ct2002539

T. K. Dickens and R. B. Mallion,  "Topological ring-currents and bond-currents in the altan-[r,s]-coronenes" Chem. Commun.,  51 1819-1822 (2015)  DOI: dx.doi.org/10.1039/C4CC07322C

For further information on the CamELS project please follow this link:

https://www.webarchive.org.uk/wayback/archive/20140613220103/http://www.jisc.ac.uk/whatwedo/programmes/di_research/researchtools/camels.aspx