Surface studies of supported model catalysts

The synthesis, characterization, and ethylene polymerization behavior of a series of iron and cobalt halide complexes, LMXn (M = Fe, X = Cl, n = 2, 3, X = Br, n = 2; M = Co, X = Cl, n = 2), bearing chelating 2,6-bis(imino)pyridyl ligands L [L = 2,6-(ArNCR1)2C5H3N] is reported. X-ray diffraction studies show the geometry at the metal centers to be either distorted square pyramidal or distorted trigonal bipyramidal. Treatment of the complexes LMXn with methylaluminoxane (MAO) leads to highly active ethylene polymerization catalysts converting ethylene to highly linear polyethylene (PE). LFeX2 precatalysts with ketimine ligands (R1 = Me) are approximately an order of magnitude more active than precatalysts with aldimine ligands (R1 = H). Catalyst productivities in the range 3750−20600 g/mmol·h·bar are observed for Fe-based ketimine catalysts, while Co ketimine systems display activities of 450−1740 g/mmol·h·bar. Molecular weights (Mw) of the polymers produced are in the range 14000−611000. Changing reaction ...

Iron and cobalt ethylene polymerization catalysts bearing 2,6-bis(imino)pyridyl ligands : synthesis, structures, and polymerization studies

Triazoles and tetrazoles: Prime ligands to generate remarkable coordination materials

Synthetic Methods for Compounds Having CF3–S Units on Carbon by Trifluoromethylation, Trifluoromethylthiolation, Triflylation, and Related Reactions

History, overview and applications of mediated lignolytic systems, especially laccase-mediator-systems (Lignozym-process)

Structure of a zirconoxyborane having a zirconium-fluorine-carbon bridge

On montre qu'a 80 K, l'adsorption d'especes a CO lie a l'extremite, sur du Pd sature avec des especes a CO ponte entraine la conversion stœchiometrique de 2 especes a CO-ponte en especes a CO-terminal pour chaque CO terminal adsorbe

Stoichiometric adsorbate species interconversion processes in the chemisorbed layer. An infrared study of the carbon monoxide/palladium system

Coordination compounds of benzotriazole and related ligands

Etude structurale par diffraction RX du complexe Cu 5 (BTA) 6 (t-C 4 H 9 NC) 4 . Cristallisation dans le groupe P42 1 c avec a=13,836 et c=16,686 A, Z=2. Affinement jusqu'a R=0,047. Le cuivre II est entoure de facon octaedrique par quatre cuivre I en coordination tetraedrique. Spectres RPE obtenus a differentes temperatures dans l'azote liquide

Two-dimensional dynamical Jahn-Teller effects in a mixed-valence benzotriazolato copper cluster, Cu5(BTA)6(RNC)4

La reaction de H 2 C(SO 2 CF 3 ) 2 avec [(C 6 H 5 ) 3 P] 2 Pt(C 2 H 4 ) donne trans-[(C 6 H 5 ) 3 ] 2 PtH [C-HC(SO 2 CF 3 ) 2 ]. Ce compose est transpose en son isomere cis puis est rapidement solvolyse par des bases de Lewis pour donner trans-[(C 6 H 5 ) 3 P] 2 PtHL + -HC(SO 2 CF 3 ) 2 − . Dimerisation de certains de ces complexes. Structure cristalline

Allen R. Siedle

Papers

Structure of a zirconoxyborane having a zirconium-fluorine-carbon bridge

Stoichiometric adsorbate species interconversion processes in the chemisorbed layer. An infrared study of the carbon monoxide/palladium system

Coordination compounds of benzotriazole and related ligands

Two-dimensional dynamical Jahn-Teller effects in a mixed-valence benzotriazolato copper cluster, Cu5(BTA)6(RNC)4

Facile addition and elimination reactions of fluorocarbon acids at platinum