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Issue 32, 2011
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Substituted pyridazines as ligands in homoleptic (fac and mer) and heteroleptic Ru(II) complexes

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Abstract

This article reports the preparation of a range of phenyl, pyridyl and pyrazinyl substituted pyridazinesvia the inverse electron demand [2 + 4] Diels–Alder reaction between 3,6-di(2-pyridyl)-1,2,4,5-tetrazines (bptz) and 3,6-di(2-pyrazinyl)-1,2,4,5-tetrazines (bpztz) and suitable dienophiles including acenaphthalene. The resulting polyaromatic compounds vary systematically in the number of aromatic substituents and the number and position of N-heteroatoms. For four of these compounds, the effect of the molecular changes on the solid-state structures were investigated using single crystal X-ray crystallography. The pyridazines were used as bidentate ligands in {M(II)(bipy)2} and tris(homoleptic) complexes (M = Fe, Ru). The optical and electrochemical properties of these complexes reflect the electron accepting character of the new ligands. The facial and meridional isomers of the tris complexes could be separated by column chromatography (on silica), thus allowing a spectral comparison of their absorption and emission properties. The solid-state structures of several of the metal complexes are discussed, including that of the facial isomer of the trisRu(II) complex of 3,6-bis(2-pyridyl)-4,5-bis(4-pyridyl)pyridazine—a potential preformed geometric motif for the predirected construction of supramolecular assemblies.

Graphical abstract: Substituted pyridazines as ligands in homoleptic (fac and mer) and heteroleptic Ru(ii) complexes

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Publication details

The article was received on 28 Feb 2011, accepted on 25 May 2011 and first published on 14 Jul 2011


Article type: Paper
DOI: 10.1039/C1DT10340G
Citation: Dalton Trans., 2011,40, 8206-8212
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    Substituted pyridazines as ligands in homoleptic (fac and mer) and heteroleptic Ru(II) complexes

    G. Cooke, G. M. Ó Máille, R. Quesada, L. Wang, S. Varughese and S. M. Draper, Dalton Trans., 2011, 40, 8206
    DOI: 10.1039/C1DT10340G

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