CuII-salan compounds: Synthesis, characterization and evaluation of their potential as oxidation catalysts
CuII-salan compounds: Synthesis, characterization and evaluation of their potential as oxidation catalysts
复制标题
DOI：
10.1016/j.jorganchem.2013.10.019
复制
发表时间：
2014-06-15
影响因子：
2.3
通讯作者：
Pessoa, Joao Costa
中科院分区：
文献类型：
--
作者：
Adao, Pedro;Barroso, Sonia;Pessoa, Joao Costa
我们报道了几种salan型Cu-II配合物的合成和表征。对几种CuII配合物获得了适合x射线衍射的合适晶体，包括一种“半salen”化合物，揭示了d(9)种常见的方平面配位环境。研究了Cu-II-salan配合物在亚砜化、烯烃氧化和氧化萘酚偶联中的催化作用。在室温下，化合物在亚砜化和烯烃氧化中表现出低至中等的催化活性，但在氧化萘酚偶联中没有活性。Cu中心周围的饱和配位环境可能是其催化活性低于Ti-和V-salan类似物的主要原因。光谱和质谱研究表明，在H2O2存在下，Cu-II-salan配合物在40℃下的分解速度明显快于室温。观察到的催化活性可能是由于在质谱研究中观察到的Cu-II-salan降解产物，而不是原始的Cu-II-salan前体。(C) 2013 Elsevier B.V.版权所有
We report the synthesis and characterization of several salan-type Cu-II complexes. Suitable crystals suitable for X-ray diffraction were obtained for several of the CuII complexes, including a "half-salen" compound, revealing square-planar coordination environments common to d(9) species. The Cu-II-salan complexes are tested as catalysts in sulfoxidation, alkene oxidation, and oxidative naphthol coupling. At room temperature the compounds exhibit low to moderate catalytic activity in sulfoxidations and alkene oxidations, but no activity in oxidative naphthol coupling. The saturated coordination environments around the Cu centers probably are the main reason for the lower catalytic activities compared to the Ti- and V-salan analogs. Spectroscopic and mass spectrometry studies revealed that the Cu-II-salan complexes decompose, in the presence of H2O2, significantly faster at 40 degrees C than at room temperature. The catalytic activity observed is probably due to the Cu-II-salan degradation products, observed in the mass spectrometry studies, and not to the original Cu-II-salan precursors. (C) 2013 Elsevier B.V. All rights reserved.