用支持的有机 (IV) 催化剂对 (II) 改性进行化学选择性化
Jeffrey Camacho-Bunquin1, Magali Ferrandon1, Hyuntae Sohn1
1Chemical Sciences and Engineering Division , Argonne National Laboratory , 9700 S Cass Avenue , Lemont , Illinois 60439 , United States.
Journal of the American Chemical Society
|February 28, 2018
概括
精确定义的有机 (IV) 位点被成功移植到支上. 这些新型催化剂在温和条件下有效地进行选择性化和化.
科学领域:
- 不同质的催化
- 有机金属化学
- 材料科学
背景情况:
- 开发高效和选择性的催化剂对于可持续的化学合成至关重要.
- 同质催化剂的异质化在分离和可重复使用方面具有优势.
- 有机复合物在各种催化转化中表现有希望.
研究的目的:
- 在二氧化支上合成和表征明确的有机 (IV) 位点.
- 研究选择性化和还原反应中异质化位点的催化活性.
- 了解活性部位和反应机制的性质.
主要方法:
- 表面有机金属化学用于接种部位.
- 固态光谱 (XAS,DRIFTS,DRUV-vis,SS NMR与DNP) 用于表征.
- 用温度调节 (TPR-H2) 和传输电子显微镜 (TEM) 进行分析.
- 用于机械研究的计算建模和现场光谱.
主要成果:
- 高分散的 (甲基cyclopentadienyl) 甲基 (IV) 位点 ((MeCp) PtMe) 已成功移植到Zn (II) 修改的SiO2支上.
- 表面反应在热力学上是有利的,由于基酸度增加.
- 在化实验中观察到表面Pt(IV) -H物种的形成.
- 异质化催化剂在1,3-二烯的部分化和二烯衍生物的降解中表现出高的选择性和效率.
结论:
- 一种新型异质化有机 (IV) 催化剂的合成和特征.
- 在温和条件下,催化剂在选择性化和还原反应中表现出色.
- 这些发现为精细化学合成的先进金属催化剂的设计提供了洞察力.
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