Host-Guest Chemistry in the Hexanuclear (Arene)ruthenium Metalla-Prismatic Cage [Ru6(p-cymene)6(tpt)2(dhnq)3]6+

Barry, Nicolas P.E.; Therrien, Bruno

doi:10.1002/ejic.200900649

Host-Guest Chemistry in the Hexanuclear (Arene)ruthenium Metalla-Prismatic Cage [Ru6(p-cymene)6(tpt)2(dhnq)3]6+

Author(s)

Barry, Nicolas P.E.

Therrien, Bruno

Institut de chimie

Date issued

2009

In

European Journal of Inorganic Chemistry, Wiley, 2009/31//4695-4700

Subjects

Arenes Host-guest systems Carceplex Ruthenium Supramolecular chemistry

Abstract

A large cationic triangular metalla-prism, [Ru6(p-cymene)6(tpt)2(dhnq)3]6+ ([1]6+), incorporating (p-cymene)ruthenium building blocks, bridged by 5,8-dihydroxy-1,4-naphthoquinonato (dhnq) ligands, and connected by two 2,4,6-tri(pyridin-4-yl)-1,3,5-triazine (tpt) subunits, allows encapsulation of various guest molecules. This cationic cage, isolated as its triflate salt, possesses a portal size smaller than its cavity, thus allowing both, permanent and temporary encapsulation of guest molecules. The host-guest properties of [1]6+ have been studied in solution in the presence of planar molecules [phenanthrene, pyrene, (pyren-1-ylmethyl)amine, Pt(acac)2, triphenylene]. The stability constant of association (Ka) was estimated by NMR spectroscopy for the following host-guest systems: [pyrene1]6+, [phenanthrene1]6+ and [(pyren-1-ylmethyl)amine1]6+. All Ka values were found to be larger than 2.4 × 104 M-1 for these host-guest systems ([D3]acetonitrile, 21 °C). The other two synthesised complexes, [Pt(acac)21]6+ and [triphenylene1]6+, were shown to act as carceplexes only.A large cationic triangular metalla-prism, [Ru6(p-cymene)6(tpt)2(dhnq)3]6+ ([1]6+), incorporating (p-cymene)ruthenium building blocks, bridged by 5,8-dihydroxy-1,4-naphthoquinonato (dhnq) ligands, and connected by two 2,4,6-tri(pyridin-4-yl)-1,3,5-triazine (tpt) subunits, allows encapsulation of various guest molecules. This cationic cage, isolated as its triflate salt, possesses a portal size smaller than its cavity, thus allowing both, permanent and temporary encapsulation of guest molecules. The host-guest properties of [1]6+ have been studied in solution in the presence of planar molecules [phenanthrene, pyrene, (pyren-1-ylmethyl)amine, Pt(acac)2, triphenylene]. The stability constant of association (Ka) was estimated by NMR spectroscopy for the following host-guest systems: [pyrene1]6+, [phenanthrene1]6+ and [(pyren-1-ylmethyl)amine1]6+. All Ka values were found to be larger than 2.4 × 104 M-1 for these host-guest systems ([D3]acetonitrile, 21 °C). The other two synthesised complexes, [Pt(acac)21]6+ and [triphenylene1]6+, were shown to act as carceplexes only.

Publication type

journal article

Identifiers

https://libra.unine.ch/handle/20.500.14713/58820

DOI

10.1002/ejic.200900649

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Host-Guest Chemistry in the Hexanuclear (Arene)ruthenium Metalla-Prismatic Cage [Ru<sub>6</sub>(<i>p</i>-cymene)<sub>6</sub>(tpt)<sub>2</sub>(dhnq)<sub>3</sub>]<sup>6+</sup>