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Influence of molecular design on radical spin multiplicity: characterisation of BODIPY dyad and triad radical anions

DOI: 10.1039/C9CP06427C DOI Help

Authors: Barry Mangham (University of Nottingham) , Magnus W. D. Hanson-heine (University of Nottingham) , E. Stephen Davies (University of Nottingham) , Alisdair Wriglesworth (University of Nottingham) , Michael W. George (University of Nottingham) , William Lewis (University of Nottingham) , Deborah L. Kays (University of Nottingham) , Jonathan Mcmaster (University of Nottingham) , Nicholas A. Besley (University of Nottingham) , Neil R. Champness (University of Nottingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Chemistry Chemical Physics , VOL 22 , PAGES 4429 - 4438

State: Published (Approved)
Published: February 2020
Diamond Proposal Number(s): 6410

Abstract: A strategy to create organic molecules with high degrees of radical spin multiplicity is reported in which molecular design is correlated with the behaviour of radical anions in a series of BODIPY dyads. Upon reduction of each BODIPY moiety radical anions are formed which are shown to have different spin multiplicities by electron paramagnetic resonance (EPR) spectroscopy and distinct profiles in their cyclic voltammograms and UV-visible spectra. The relationship between structure and multiplicity is demonstrated showing that the balance between singlet, biradical or triplet states in the dyads depends on relative orientation and connectivity of the BODIPY groups. The strategy is applied to the synthesis of a BODIPY triad which adopts an unusual quartet state upon reduction to its radical trianion.

Subject Areas: Chemistry

Instruments: I19-Small Molecule Single Crystal Diffraction