Synthesis and characterization of enantiopure copper(II) complexes using chiral bidentate ligands

Title
Synthesis and characterization of enantiopure copper(II) complexes using chiral bidentate ligands
Author(s)
민길식[민길식]박아현[박아현]신종원[신종원]로튜 산카라 라오[로튜 산카라 라오]김석규류재정[류재정]
Keywords
JAHN-TELLER DISTORTIONS; MANGANESE(II)
Issue Date
201009
Publisher
ROYAL SOC CHEMISTRY
Citation
DALTON TRANSACTIONS, v.39, no.37, pp.8741 - 8747
Abstract
Chiral copper(II) complexes of the types [Cu(II)(R/S-ppme)(3)](ClO(4))(2) and [Cu(II)(R/S-ppme)(2)(SO(4))] have been synthesized by reactions of Cu(ClO(4))(2)center dot 6H(2)O and CuSO(4)center dot 5H(2)O with R/S-ppme in methanol under aerobic conditions (R/S-ppme = (R/S)-(+/-)-1-phenyl-N-(pyridine-2-ylmethylene) ethanamine). All complexes were isolated and characterized by X-ray crystallography and circular dichroism (CD): (Lambda)-[Cu(II)(R-ppme)(3)](ClO(4))(2) (1), (Lambda)-[Cu(S-ppme)(3)](ClO(4))(2)center dot H(2)O (2), (Lambda)-[Cu(II)(R-ppme)(2)(SO(4))]center dot 4CH(3)OH (3), and (Lambda)-[Cu(II)(S-ppme)(2)(SO(4))]center dot 4CH(3)OH (4). 1 and 2 with ClO(4)(-) anions are formed as tris(R/S-ppme) copper(II) complexes, while 3 and 4 with SO(4)(2-) are formed as bis(R/S-ppme) copper(II) complexes. The structures of 1 with R-ppmes and 4 with S-ppmes show the same absolute configurations (Lambda). In contrast, 2 with S-ppmes and 3 with R-ppmes exhibit D configurations. In the electron paramagnetic resonance (EPR) spectra of 1 and 3, both compounds demonstrate z-axis elongated structures. The CD spectra of 1 and 2 show Cotton effects in an enantiomeric pattern; those of 3 and 4 also display the same effects.
URI
http://hdl.handle.net/YU.REPOSITORY/23645http://dx.doi.org/10.1039/c0dt00380h
ISSN
1477-9226
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