Paramagnetic Resonance of Cobalt(II) Trispyrazolylmethanes and Counterion Association
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https://figshare.com/articles/dataset/Paramagnetic_Resonance_of_Cobalt_II_Trispyrazolylmethanes_and_Counterion_Association/4447469
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资源简介：
Paramagnetic resonance studies (EPR,
ESEEM, ENDOR, and NMR) of a series of cobalt(II) bis-trispyrazolylmethane
tetrafluoroborates are presented. The complexes studied include the
parent, unsubstituted ligand (Tpm), two pyrazole-substituted derivatives
(4Me and 3,5-diMe), and tris(1-pyrazolyl)ethane (Tpe), which includes
a methyl group on the apical carbon atom. NMR and ENDOR establish
the magnitude of 1H hyperfine couplings, while ESEEM provides
information on the coordinated 14N. The data show that
the pyrazole 3-position is more electron rich in the Tpm analogues,
that the geometry about the apical atom influences the magnetic resonance,
and that apical atom geometry appears more fixed in Tpm than in Tp.
NMR and ENDOR establish that the BF4– counterion remains associated in fluid solution. In the case of
the Tpm3,5Me complex, it appears to associate in solution,
in the same position it occupies in the X-ray structure.
创建时间：
2016-12-15
