Flexibility is Key: Synthesis of a Tripyridylamine (TPA) Congener with a Phosphorus Apical Donor and Coordination to Cobalt(II)
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https://figshare.com/articles/dataset/Flexibility_is_Key_Synthesis_of_a_Tripyridylamine_TPA_Congener_with_a_Phosphorus_Apical_Donor_and_Coordination_to_Cobalt_II_/2102392
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资源简介：
Tripyridylamine
(TPA), a tetradentate ligand that forms 5-membered chelate rings upon
metal coordination, has demonstrated significant utility in synthetic
inorganic chemistry. An analogue with a phosphorus apical donor is
a desirable target for tuning electronic structure and enhancing reactivity.
However, this congener has been synthetically elusive. Prior attempts
have resulted in tridentate coordination to transition metal ions
due to a lack of ligand flexibility. Herein, we report the successful
synthesis of tris(2-pyridylmethyl)proazaphosphatrane (TPAP), a more
accommodating tripyridyl ligand containing an apical phosphorus donor.
The TPAP ligand forms 6-membered chelate rings upon coordination and
binds in the desired tetradentate fashion to a Co(II) ion. Structural
studies elucidate the importance of ligand flexibility in tripodal
ligands featuring phosphorus donors. Cyclic voltammetry, UV–vis,
and solution magnetic susceptibility experiments of [Co(TPAP)(CH3CN)]2+ are also reported and compared to [Co(TPA)(CH3CN)]2+. Notably, magnetic susceptibility measurements
of [Co(TPAP)(CH3CN)]2+ indicate a low spin electronic
configuration, in contrast to [Co(TPA)(CH3CN)]2+, which is high spin.
创建时间：
2016-02-12
