Abstract
Three π-quinonoid compounds incorporating the organometalloligand ortho-quinone manganese tricarbonyl ([(C6H4O2)Mn(CO)3]−, o-QMTC) have been synthesized and characterized by IR and X-ray crystallography: [Pd(o-QMTC)(PPh3)2]BF4·CH2Cl2 (1), (o-QMTC)Rh(1,5-cyclooctadiene) (2), and Cu(o-QMTC)2 (3). The formally anionic o-QMTC ligand features Mn-arene bonding that is best described as η4-bound. Nevertheless, o-QMTC interplanar angular data and νco data suggest significant contribution from η5 and η6 forms. In each of the compounds, the o-QMTC organometalloligand(s) contribute to a square planar geometry about the Pd(II), Rh(I), or Cu(II) metal center.
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