Constructive quantum interference in a bis-copper six-porphyrin nanoring

Sabine Richert, Jonathan Cremers, Ilya Kuprov, Martin D. Peeks, Harry L. Anderson () and Christiane R. Timmel ()
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Sabine Richert: Centre for Advanced Electron Spin Resonance (CAESR), University of Oxford
Jonathan Cremers: Chemistry Research Laboratory, University of Oxford
Ilya Kuprov: University of Southampton
Martin D. Peeks: Chemistry Research Laboratory, University of Oxford
Harry L. Anderson: Chemistry Research Laboratory, University of Oxford
Christiane R. Timmel: Centre for Advanced Electron Spin Resonance (CAESR), University of Oxford

Nature Communications, 2017, vol. 8, issue 1, 1-5

Abstract: Abstract The exchange interaction, J, between two spin centres is a convenient measure of through bond electronic communication. Here, we investigate quantum interference phenomena in a bis-copper six-porphyrin nanoring by electron paramagnetic resonance spectroscopy via measurement of the exchange coupling between the copper centres. Using an analytical expression accounting for both dipolar and exchange coupling to simulate the time traces obtained in a double electron electron resonance experiment, we demonstrate that J can be quantified to high precision even in the presence of significant through-space coupling. We show that the exchange coupling between two spin centres is increased by a factor of 4.5 in the ring structure with two parallel coupling paths as compared to an otherwise identical system with just one coupling path, which is a clear signature of constructive quantum interference.

Date: 2017
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DOI: 10.1038/ncomms14842

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