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The ligand bbn and the possible isomeric forms of the mononuclear complex [Ru(phen)(bbn)]2+ with bbn as a tetradentate ligand: (a) cis-α isomer, (b) cis-β isomer, and (c) a form in which the central polymethylene chain spans the trans. Reproduced from [48] with permission. Copyright © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
