Substituent effects of N4 Schiff base ligands on the formation of fluoride-bridged dicobalt(<scp>ii</scp>) complexes <i>via</i> B–F abstraction: structures and magnetism
作者:Yae In Cho、Meredith L. Ward、Michael J. Rose
DOI:10.1039/c6dt02104b
日期:——
presence of pyridine, respectively, during metalation. The synergistic roles of pyridine and the ClPhN4 ligand in promoting B–F abstraction were clarified by the isolation and crystallization of the simple tetrakis-pyridine monomeric complex [Co(py)4(MeCN)2](BF4)2 (4) [no B–F abstraction]; subsequent addition of the ClPhN4 ligand to 4 resulted in formation of the dimeric, di-bridged complex 2. Omission
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).
US7871681B2
申请人:——
公开号:US7871681B2
公开(公告)日:2011-01-18
Large-Scale Synthesis of Symmetric Tetramine Ligands by Using a Modular Double Reductive Amination Approach
作者:Maik Tretbar、Christian B. W. Stark
DOI:10.1002/ejoc.201700772
日期:2017.12.15
Tetramine ligands play an important role in a broad range of transition metal catalyzed transformations. We here present a flexible and modular approach to this class of ligands using a double reductive aminationstrategy. Thus, the target molecules were prepared in a highly efficient manner in only three steps, from commercially available starting materials. Excellent overall yields, of up to 96 %
四胺配体在广泛的过渡金属催化转化中发挥重要作用。我们在这里使用双还原胺化策略对此类配体提出了一种灵活且模块化的方法。因此,目标分子仅通过三个步骤以高效方式从市售原料制备。达到了高达 96% 的优异总产率。值得注意的是,使用此程序可以获得手性 C 2 对称配体。所有反应都可以轻松扩展,并且以优异的纯度获得了四胺配体,而在三步序列结束时只需要一次色谱纯化。