Roy, SudiptaSudiptaRoyMondal, Kartik ChandraKartik ChandraMondalMeyer, JannJannMeyerNiepoetter, BenediktBenediktNiepoetterKoehler, ChristianChristianKoehlerHerbst-Irmer, RegineRegineHerbst-IrmerStalke, DietmarDietmarStalkeDittrich, BirgerBirgerDittrichAndrada, Diego M.Diego M.AndradaFrenking, GernotGernotFrenkingRoesky, Herbert W.Herbert W.Roesky2018-11-072018-11-072015https://resolver.sub.uni-goettingen.de/purl?gro-2/36817An elegant general synthesis route for the preparation of two coordinate palladium(0) and platinum(0) complexes was developed by reacting commercially available tetrakis(triphenylphosphine)palladium/platinum with -accepting cyclic alkyl(amino) carbenes (cAACs). The complexes are characterized by NMR spectroscopy, mass spectrometry, and single-crystal X-ray diffraction. The palladium complexes exhibit sharp color changes (crystallochromism) from dark maroon to bright green if the C-Pd-C bond angle is sharpened by approximately 6 degrees, which is chemically feasible by elimination of one lattice THF solvent molecule. The analogous dark orange-colored platinum complexes are more rigid and thus do not show this phenomenon. Additionally, [(cAAC)(2)Pd/Pt] complexes can be quasi-reversibly oxidized to their corresponding [(cAAC)(2)Pd/Pt](+) cations, as evidenced by cyclic voltammetry measurements. The bonding and stability are studied by theoretical calculations.journal_article10.1002/chem.20150075825940809000356795000005