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Issue 32, 2013
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Resolution and characterization of helicate dimer and trimer complexes of 1,3-bis(9-methyl-1,10-phenanthrolin-2-yl)propane with copper(I)

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Abstract

Complexation of copper(I) with the binucleating ligand, 1,3-bis(9-methyl-1,10-phenanthrolin-2-yl)propane, mphenpr, result in formation of helical dimers, [Cu2(mphenpr)2]2+. The resolution of the enantiomeric forms of the dimers has been carried out with Δ-[As(cat)3] as resolving agent and X-ray structures for two compounds, P-[Cu2(mphenpr)2](Δ-[As(cat)3])2 and P-[Cu2(mphenpr)2](Δ-[As(cat)3])2·4(CH3CN), are reported. The rate of racemization in poorly-coordinating solvents has been examined by 1H NMR, and is slow. At saturating concentrations of [[Cu2(mphenpr)2]2+] in acetonitrile, crystals of the helical trimeric complex [Cu3(mphenpr)3](ClO4)3 are obtained. The X-ray structure of the trimer is reported. This species has also been resolved. As with the helical dimer, racemization in poorly-coordinating solvents is slow, and circular dichroism and 1H NMR spectra are reported. The absolute configuration of the resolved complex, P-[Cu3(mphenpr)3](Δ-[As(cat)3])3, has been determined by X-ray crystallography.

Graphical abstract: Resolution and characterization of helicate dimer and trimer complexes of 1,3-bis(9-methyl-1,10-phenanthrolin-2-yl)propane with copper(i)

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Publication details

The article was received on 12 Apr 2013, accepted on 22 Jun 2013 and first published on 24 Jun 2013


Article type: Paper
DOI: 10.1039/C3DT50971K
Citation: Dalton Trans., 2013,42, 11426-11435
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    Resolution and characterization of helicate dimer and trimer complexes of 1,3-bis(9-methyl-1,10-phenanthrolin-2-yl)propane with copper(I)

    L. Lemus, J. Guerrero, J. Costamagna, R. Lorca, D. H. Jara, G. Ferraudi, A. Oliver and A. G. Lappin, Dalton Trans., 2013, 42, 11426
    DOI: 10.1039/C3DT50971K

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