Article,

9-Oxidophenalenone: A Noninnocent b-Diketonate Ligand?

, , , , and .
Inorganic Chemistry, 51 (7): 4390--4397 (2012)
DOI: 10.1021/ic300207d

Abstract

The redox systems [Ru(L)(bpy)2]k, [Ru(L)2(bpy)]m, and [Ru(L)3]n contg. the potentially redox-active ligand 9-oxidophenalenone = L- were studied by spectroelectrochem. (UV-visible-near-IR and ESR) in conjunction with d. functional theory (DFT) calcns. [Ru(L-)(bpy)2]ClO4 ([1]ClO4) and [Ru(L-)2(bpy)]ClO4 ([2]ClO4) were structurally characterized. In addn. to establishing electron-transfer processes involving the RuII/RuIII/RuIV and bpy0/bpy·- couples, evidence for the noninnocent behavior of L- was obtained from [RuIV(L·)(L-)(bpy)]3+, which exhibits strong near-IR absorption due to ligand-to-ligand charge transfer. In contrast, the lability of the electrogenerated [Ru(L)2(bpy)]- is attributed to a resonance situation [RuII(L·2-)(L-)(bpy)]-/[RuII(L-)2(bpy·-)]-, as suggested by DFT calcns. [on SciFinder(R)]

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