A Synergy and Struggle of EPR, Magnetometry and NMR:
A Case Study of Magnetic Interaction Parameters in a Six-Coordinate
Cobalt(II) Complex
Posted on 2020-07-16 - 20:45
Herein,
we combine for the first time SQUID magnetometry, cw-EPR,
THz-EPR, and paramagnetic NMR spectroscopies to study the magnetic
properties of a high-spin cobalt(II) heteroscorpionate complex. Complementary
information provided by these methods allowed precise determination
of the magnetic interaction parameters, thereby removing the ambiguity
inherit to single-method studies. We systematically investigate the
extent to which information about the magnetic interaction parameters
can be deduced from reduced data sets. The detailed study revealed
significant different magnetic properties in solid state and solution.
To further exploit the information content of the solution NMR experimental
results, we introduce the new concept of reduced paramagnetic shift.
It allows for the determination of the magnetic axes and, subsequently,
full NMR signal assignment. It is shown that even in complicated cases,
in which common NMR analytics (integral intensities, relaxation factors,
etc.) fail, it yields robust results.
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Pavlov, Alexander A.; Nehrkorn, Joscha; Zubkevich, Sergey V.; Fedin, Matvey V.; Holldack, Karsten; Schnegg, Alexander; et al. (2020). A Synergy and Struggle of EPR, Magnetometry and NMR:
A Case Study of Magnetic Interaction Parameters in a Six-Coordinate
Cobalt(II) Complex. ACS Publications. Collection. https://doi.org/10.1021/acs.inorgchem.0c01191