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The concept of 'non-innocence' in coordination chemistry has been around for several decades but is still a topical subject because of its relevance to helping us understand the redox, magnetic and spectroscopic properties of metal complexes. This article describes recent work with two quite different classes of polynuclear complex, based on ruthenium-dioxolene or tris(pyrazolyl)borato-molybdenum fragments, which show non-innocent behaviour. In particular the consequences of non-innocent behaviour for (i) metal-metal electronic interactions in dinuclear complexes, and (ii) optical spectroscopic properties in electrochromic complexes, are highlighted.

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The new tripodal ligand tris-[3-(2'-pyridyl)pyrazol-l -yl]hydroborate (L-), comprising three N,N-bidentate chelating arms linked by the apical boron atom, has been synthesized; the crystal structure of [EuL(MeOH),F][PF6I reveals the nine-coordinate metal lying within the hexadentate ligand cavity.