Issue 9, 2011

Formation of chiral heterometallic oligomers by combination of inert Ru(iii) tectons and labile Ni(ii) connectors

Abstract

Complex ligands, [Ru(III)(acac)n(taetH)3−n] (acacH = acetylacetone, taetH2 = tetraacetylethane), denoted as one-handed and two-handed tectons for n = 2 and 1, respectively, were synthesized and optically resolved. These chiral tectons were reacted with Ni2+ ions in the presence of excess N,N,N′,N′-tetramethylethylenediamine (tmen) in methanol or methanol/chloroform. In the case of a one-handed tecton, a trinuclear complex, [{Ru(III)(acac)2(taet)}2Ni(II)(tmen)], was formed in the ratio of Ni(II)/Ru(III) = 0.5. No chirality was induced in the coordination spheres of labile Ni(II) connectors. In the case of a two-handed tecton, a soluble oligomer, [{Ru(III)(acac)(taet)2Ni(II)(tmen)}nNi(II)(tmen)]2+ (n ≈ 4), was produced around Ni(II)/Ru(III) = 1.0 as deduced by XPS analyses and gel chromatography. When the reaction was monitored by electronic circular dichroism, a new peak appeared in the region of 300–400 nm, where the portion of –(taet)Ni(II)(tmen)(taet)– in the oligomers had an electronic absorption. From the vibrational circular dichroism spectra of the same solution, the coordination sphere of a Ni(II) connector was concluded to take a Δ- or Λ-configuration preferably, depending on the Λ- or Δ-configuration of adjacent –(taet)Ru(III)(acac)(taet)– portions, respectively.

Graphical abstract: Formation of chiral heterometallic oligomers by combination of inert Ru(iii) tectons and labile Ni(ii) connectors

Supplementary files

Article information

Article type
Paper
Submitted
30 Apr 2011
Accepted
07 Jun 2011
First published
30 Jun 2011

New J. Chem., 2011,35, 1823-1828

Formation of chiral heterometallic oligomers by combination of inert Ru(III) tectons and labile Ni(II) connectors

H. Sato, A. Nakao and A. Yamagishi, New J. Chem., 2011, 35, 1823 DOI: 10.1039/C1NJ20381A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements