Structural Variety of Isopropyl-bis(2-picolyl)amine Complexes with Zinc(II) and Copper(II)
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资源简介：
A variety of structurally
different complexes of the isopropyl-bis(2-picolyl)amine
(iPr-bpa) ligand were prepared
with ZnA2 and CuA2 salts (A = Br–, Br–/PF6–, BF4–/F–, ClO4–). The choice of different counterion affected the
stoichiometry, coordination number, geometry, and formation of geometrical
isomers. Crystal structures of four Zn(II) complexes, namely, two
monomers (mer-[Zn(iPr-bpa)Br2] and fac-[Zn(iPr-bpa)Br2]), one F–-bridged dimer ([Zn2(μ-F)2(iPr-bpa)2](BF4)2), and one ML2 complex ([Zn(iPr-bpa)2](ClO4)2) were determined, and their solution structures were
studied by NMR spectroscopy. For the ML2 complex, relative stabilities of geometrical isomers were
determined using density functional theory calculations. For Cu(II)
complexes, five crystal structures were determined, namely, two monomers
([Cu(iPr-bpa)Br2] and [Cu(iPr-bpa)(ClO4)2(H2O)]), a Br–-bridged
dimer ([Cu2(μ-Br)(Br)2(iPr-bpa)2](PF6)), a F–-bridged
coordination polymer ([Cu(μ-F)(iPr-bpa)]n(BF4)n × nCH3OH), and a cyclic,
CO32–-bridged trimer ([Cu3(tri-μ-CO3)(ClO4)3(iPr-bpa)3](ClO4)). The different crystallographic
structures of Cu(II) complexes are reflected in their different magnetic
properties investigated by electron spin resonance spectroscopy and
magnetic susceptibility measurements.
创建时间：
2020-02-20
