Catalysis Letters, Vol.145, No.12, 2010-2019, 2015
Pd- and Ni-Pyridyl Complexes Deposited as Films for Suzuki-Miyaura and Mizoroki-Heck Cross Coupling Reactions
A pyridyl fluorene ligand, 2,7-bis(4-pyridyl)-9,9-diethylfluorene (1), has been synthesized by a simple route. The ability of the two linearly terminal pyridyl nitrogen atoms of 1 to coordinate with the Pd(II) or Ni(II) ions has enabled the use of 1 as a linking ligand in the preparation of (PdCl2/1) (n) , (Ni(NO3)(2)/1) (n) films, PdCl2/1 and Ni(NO3)(2)/1 complex. The resulting films and complexes were characterized by UV-vis spectroscopy, atomic force microscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectrometer. The application of films and complexes as catalysts for Suzuki-Miyaura and Mizoroki-Heck reactions was carried out. (PdCl2/1) (n) films show high catalytic activity in the reactions with the Pd loading of ppm. (Ni(NO3)(2)/1) (n) multilayers as the active catalytic moieties for these reactions were investigated with very low Ni(II)-loading. The (Pd or Ni/1) (n) multilayer films were used as high active catalysts for the C-C formation with extremely low M(II)-loading in ppm level.