Copper(II) complexes derived from substituted 2,2 '-bis-(4-isopropyl-4-methyl-4,5-dihydro-1H-imidazol-5-one) ligands: Synthesis, structure and catalytic activity
ČlánekOtevřený přístuppeer-reviewedpostprintDatum publikování
2008
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Elsevier
Abstrakt
New chiral N,N-bidentate 2,2′-bis-(4-isopropyl-4-methyl-4,5-dihydro-1H-imidazol-5-one) ligands have been prepared and characterised by their 1H and 13C NMR spectra and/or optical rotation. The ligands prepared were then tested for their ability to form complexes with copper(II) salts. It was found that the most stable complex is formed from the 2,2′-bis-(4-isopropyl-1,4-dimethyl-4,5-dihydro-1H-imidazol-5-one) ligand and copper(II) chloride. The structure of this complex was determined by means of quantum-chemical computations at the B3LYP or UB3LYP/6-31G(d,p) level. According to the computations, the geometry of the copper atom most resembles a tetrahedral arrangement, which was also confirmed by means of X-ray structural analysis. It was found that the structure of this copper(II) complex does not allow the copper atom to coordinate to additional ligands; therefore, it is catalytically inactive in the asymmetric Henry reaction.
Rozsah stran
p. 268-274
ISSN
0277-5387
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Zdrojový dokument
Polyhedron. 2008, vol. 27, issue 1
Vydavatelská verze
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TH8-4R1FSJ6-2&_user=640852&_coverDate=01%2F20%2F2008&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_acct=C000032310&_version=1&_urlVersion=0&_userid=640852&md5=68b3ae359a54a60233a4ed0758e5ee71&searchtype=a
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Klíčová slova
Nitrogen bidentate ligands, 4,5-Dihydro-1H-imidazol-5-ones, Copper(II) complexes, B3LYP/6-31G(d,p), Asymmetric catalysis