Synthesis and structural characterization of mono- and dinuclear Ni<sup>II</sup>and Pd<sup>II</sup>complexes derived from tetradentate 1,7-<i>bis</i>-(pyridin-2-yl)-2,6-diaza-1,6-heptadiene
作者:J. Roberto Pioquinto-Mendoza、David G. Olvera-Mendoza、Noemí Andrade-López、José G. Alvarado-Rodríguez、Rafael Moreno-Esparza、Marcos Flores-Álamo
DOI:10.1080/00958972.2013.806985
日期:2013.7.1
The reaction of Schiff base 1,7-bis-(pyridin-2-yl)-2,6-diaza-1,6-heptadiene (L) with either NiCl26H2O or [(PdCl2)-Cl-II(CH3CN)(2)]/Na[BF4] in 1:1 stoichiometry yielded mononuclear ionic complexes, trans-[Ni-II(L)(H2O)(2)]Cl-23H2O (13H2O) and [Pd-II(L)][BF4](2) (2), respectively; the reaction of L with [(PdCl2)-Cl-II(CH3CN)(2)] in 1:2 ratio yielded dinuclear cis-[Pd-II (2)(-L)Cl-4] (3). Complexes 1-3 were characterized by vibrational spectroscopy and X-ray diffraction; diamagnetic 2 and 3 were also characterized by NMR in solution. The molecular structures of 1 and 2 displayed tetradentate coordination of L with formation of two five-membered and one six-membered chelate rings for both complexes. In 3, L showed bidentate coordination mode for each pyridylimine toward Pd-II. Complex 1 has distorted octahedral geometry around Ni-II and an extended hydrogen-bond network; distorted square planar geometry around Pd-II in 2 and 3 was observed.
Coating Composition for Offset Paper
申请人:Scholte Bert
公开号:US20090123768A1
公开(公告)日:2009-05-14
Coating for an offset paper comprising a catalyst for fixing polymerisable or crosslinkable constituents of the offset ink. The chemical drying time can be substantially reduced if such a catalyst system is added to the coating, wherein preferentially such a catalyst is a transition metal complex/salt, like Mn (2-ethylhexanoate, bpy).