Abstract
Reaction of [Pt(DMSO)2Cl2] or [Pd(MeCN)2Cl2] with the electron-rich LH=N,N'-bis(4-dimethylaminophenyl)ethanimidamide yielded mononuclear [PtL2] (1) but dinuclear [Pd2L4] (2), a paddle-wheel complex. The neutral compounds were characterized through experiments (crystal structures, electrochem., UV-vis-NIR spectroscopy, magnetic resonance) and TD-DFT calculations as metal(II) species with noninnocent ligands L-. The reversibly accessible cations [PtL2]+ and [Pd2L4]+ were also studied, the latter as [Pd2L4][B3,5-(CF3)2C6H34] single crystals. Exptl. and computational investigations were directed at the elucidation of the electronic structures, establishing the correct oxidation states within the alternatives [PtII(L-)2] or [Pt.(L)2], [PtII(L0.5-)2]+ or [PtIII(L-)2]+, [(PdII)2(m-L-)4] or [(Pd1.5)2(m-L0.75-)4], and [(Pd2.5)2(m-L-)4]+ or [(PdII)2(m-L0.75-)4]+. In each case, the first alternative was shown to be most appropriate. Remarkable results include the preference of platinum for mononuclear planar [PtL2] with an N-Pt-N bite angle of 62.8(2)° in contrast to [Pd2L4], and the dimetal (Pd24+$\rightarrow$Pd25+) instead of ligand (L-$\rightarrow$L) oxidation of the dinuclear palladium compound
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