Ring currents modulate optoelectronic properties of aromatic chromophores at 25 T

KUDISCH, BRYAN; MAIURI, MARGHERITA; MORETTI, LUCA; OVIEDO, MARIA B.; WANG, LEON; OBLINSKY, DANIEL G.; PRUD?HOMME, ROBERT K.; WONG, BRYAN M.; MCGILL, STEPHEN A.; SCHOLES, GREGORY D.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

NATL ACAD SCIENCES

Año: 2020 vol. 117 p. 11289 - 11289

0027-8424

he properties of organic molecules can be influenced by magnetic fields, and these magnetic field effects are diverse. They range from inducing nuclear Zeeman splitting for structural determination in NMR spectroscopy to polaron Zeeman splitting organic spintronics and organic magnetoresistance. A pervasive magnetic field effect on an aromatic molecule is the aromatic ring current, which can be thought of as an induction of a circular current of π-electrons upon the application of a magnetic field perpendicular to the π-system of the molecule. While in NMR spectroscopy the effects of ring currents on the chemical shifts of nearby protons are relatively well understood, and even predictable, the consequences of these modified electronic states on the spectroscopy of molecules has remained unknown. In this work, we find that photophysical properties of model phthalocyanine compounds and their aggregates display clear magnetic field dependences up to 25 T, with the aggregates s