Abstract
The exchange interaction (J) between two spin centres is a convenient measure of through bond electronic communication. This chapter will describe the investigation of quantum interference phenomena in a bis-copper six-porphyrin nanoring (c-P6Cu2·T6) by using 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 (D). 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 pathways as compared to an otherwise identical system with just one coupling path. This observation is a signature of constructive quantum interference.
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