%0 Journal Article %A Shaffer, David W. %A Ryken, Scott A. %A Zarkesh, Ryan A. %A Heyduk, Alan F. %D 2012 %T Ligand Effects on the Oxidative Addition of Halogens to (dpp-nacnacR)Rh(phdi) %U https://acs.figshare.com/articles/journal_contribution/Ligand_Effects_on_the_Oxidative_Addition_of_Halogens_to_dpp_nacnac_sup_R_sup_Rh_phdi_/2467609 %R 10.1021/ic300733j.s001 %2 https://acs.figshare.com/ndownloader/files/4110310 %K X 2 oxidants %K octahedral complexes exhibit %K cyclic voltammograms %K 1 H NMR spectroscopy %K mass spectrometry %K HBF 4 %K rhodium %K UV %K CH %K CF %K Ligand Effects %K Oxidative Addition %K octahedral diiodide %K metal center %X The treatment of (dpp-nacnacR)­Rh­(phdi) {(dpp-nacnacR) = CH­[C­(R)­(N-iPr2C6H3)]2; R = CH3, CF3; phdi = 9,10-phenanthrenediimine} with X2 oxidants afforded octahedral rhodium­(III) products in the case of X = Cl and Br. The octahedral complexes exhibit well-behaved cyclic voltammograms in which a two-electron reduction is observed to regenerate the initial rhodium­(I) complex. When treated with I2, (dpp-nacnacCH3)­Rh­(phdi) produced a square pyramidal η1-I2 complex, which was characterized by NMR and UV–vis spectroscopies, mass spectrometry, and X-ray crystallography. The more electron poor complex (dpp-nacnacCF3)­Rh­(phdi) reacted with I2 to give a mixture of two products that were identified by 1H NMR spectroscopy as a square pyramidal η1-I2 complex and an octahedral diiodide complex. Reaction of the square pyramidal (dpp-nacnacCH3)­Rh­(I2)­(phdi) with HBF4 resulted in protonation of the (dpp-nacnacCH3) backbone to provide an octahedral rhodium­(III) diiodide species. These reactions highlight the impact that changes in the electron-withdrawing nature of the supporting ligands can have on the reactivity at the metal center. %I ACS Publications