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. Author manuscript; available in PMC: 2012 Apr 22.
Published in final edited form as: Inorg Chem. 2009 Nov 2;48(21):10001–10017. doi: 10.1021/ic901328v

Figure 6.

Figure 6

(Left) The three-atom dfpma ligand shown in Chart 1 possessing an electron donor bridgehead (D) between two π-accepting moieties (A), which can be used to stabilize two-electron mixed-valence cores. The stabilization of a mixed-valence core by the A–D–A stereoelectronic ligand motif results in differing bond orders indicative of an asymmetric electronic distribution. (Right) A crystal structure of Rh20,II(dfpma)3Br2 displays the long-short bond alteration of the ligand backbone. Reproduced from ref. 8.