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Quantum Chemical Modeling of Pressure-Induced Spin Crossover in Octahedral Metal-Ligand Complexes

preprint
submitted on 28.08.2019 and posted on 29.08.2019 by Tim Stauch, Romit Chakraborty, Martin Head-Gordon
Spin state switching on external stimuli is a phenomenon with wide applicability ranging from molecular electronics to gas activation in nanoporous frameworks. Here we model spin crossover as a function of hydrostatic pressure in octahedrally coordinated transition metal centers by applying a field of effective nuclear forces that compress the molecule towards its centroid. For spin crossover in first-row transition metals coordinated by hydrogen, nitrogen, and carbon monoxide, we find the pressure required for spin transition to be a function of ligand position in the spectrochemical sequence. While pressures on the order of 1 GPa are required to flip spins in homogeneously ligated octahedral sites, we demonstrate a five-fold decrease in spin transition pressure for the archetypal strong field ligand carbon monoxide in octahedrally coordinated Fe2+ in [Fe(II)(NH3)5CO]2+.

Funding

Deutsche Forschungsgemeinschaft STA 1526/1-1

Deutsche Forschungsgemeinschaft STA 1526/2-1

DOE funded hydrogen storage consortium

History

Email Address of Submitting Author

tstauch@uni-bremen.de

Institution

University of Bremen

Country

Germany

ORCID For Submitting Author

0000-0001-7599-3578

Declaration of Conflict of Interest

no conflict of interest

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