The synthesis of a series of platinum complexes containing cyclooctadiene ligands with the general structure PtMeL(R-cod) (where L = Cl, I, nC 3 F 7 , iC 3 F 7 , nC 8 F 17 , Me, aryl, alkynyl and R = H, Me, Et, iPr, nBu, iBu, nHex, Ph) is presented. All complexes are remarkably stable and were obtained in excellent yields. Their structure in both solution and the solid state were explored by crystal structures and multinuclear ( 1 H, 13 C, 19 F, 195 Pt) NMR spectroscopy. Cytotoxicity experiments with selected complexes in HeLa cells revealed higher toxicity in comparison to that of cisplatin for most of the structures.
Investigations on the metal-organic (MO)CVD of platinum nanoparticles on spherical, chemical vapor synthesis (CVS)produced SiO 2 substrates are discussed in this paper. Commercially available methylcyclopentadienyl trimethyl platinum (MeCpPtMe 3 ) (1) and three newly synthesized cyclooctadienyl platinum precursors are chosen and tested during a continuous CVD/CVS process. The synthesis of this new class of stable, halogen-free precursors for atmospheric pressure (AP)CVD is presented. The complexes [PtMe 2 (R-COD)], where R ¼ Et (2a), n Bu (2b), and i Bu (2c), are shown to be highly suitable for the preparation of platinum nanoparticles. The precursors are characterized and their thermal properties are studied by thermogravimetric analysis (TGA) and infrared (IR). Investigations of the precursor decomposition mechanism, the effect of oxygen, and the autocatalytic effect during CVD are also carried out. Finally, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analyses prove that continuous CVS of gas-borne support particles combined with MOCVD of these newly synthesized platinum precursors gives ordered, defined platinum nanocatalysts with high dispersion and narrow size distribution (2 À 3 nm).
Triazole‐based phosphanes have recently been shown to be interesting ligands in organometallic catalysis. The synthesis of novel [2.2]paracyclophane‐substituted triazole‐based phosphane ligands was achieved. The possibility to synthesize these molecules in a highly enantioenriched form is also reported. Moreover, the ability of the novel ligands to coordinate with metal centers was explored. Besides a dinuclear copper complex, a PdII complex could also be isolated, the structure of which was characterized by X‐ray analysis. PdII complexes derived from these ligands provide highly active catalysts for the Suzuki–Miyaura coupling of aryl chlorides.
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