Molecular Pseudorotation in Phthalocyanines as a Tool for Magnetic Field Control at the Nanoscale

TL;DR

This paper explores how light-induced molecular pseudorotation in metal phthalocyanines can be used to control magnetic fields at the nanoscale by generating and manipulating magnetic dipole moments through vibrational excitation.

Contribution

It introduces a novel method of controlling nanoscale magnetic fields via optical stimulation of vibrational states in phthalocyanines, leveraging pseudorotation mechanisms.

Findings

Pseudorotation can be triggered by infrared pulses.

Magnetic dipole moments can be generated and controlled.

Estimated changes in magnetic shielding constants for future validation.

Abstract

Metal phthalocyanines, a highly versatile class of aromatic, planar, macrocyclic molecules with a chelated central metal ion, are topical objects of ongoing research and particularly interesting due to their magnetic properties. However, while current focus lies almost exclusively on spin-Zeeman-related effects, the high symmetry of the molecule and its circular shape suggests the exploitation of light-induced excitation of twofold degenerate vibrational states in order to generate, switch and manipulate magnetic fields at the nanoscale. The underlying mechanism is a molecular pseudorotation that can be triggered by infrared pulses and gives rise to a quantized, small but controllable magnetic dipole moment. We investigate the optical stimulation of vibrationally-induced molecular magnetism and estimate changes in the magnetic shielding constants for confirmation by future experiments.