Chiral Co(II) Metal–Organic Framework in the Heterogeneous Catalytic Oxidation of Alkenes under Aerobic and Anaerobic Conditions
作者:Giulia Tuci、Giuliano Giambastiani、Stephanie Kwon、Peter C. Stair、Randall Q. Snurr、Andrea Rossin
DOI:10.1021/cs401003d
日期:2014.3.7
calculations, with the aim of probing effective oxygen uptake by the heterogeneous catalyst and unraveling the nature of the active species in the catalytic oxidation process under aerobic conditions. Theoretical results indicate the presence of an η1-superoxo species at the cobalt center, with concomitant Co(II) ↔ Co(III) oxidation. Finally, the experimental estimation of the O2 adsorption enthalpy
手性Co(II)MOF [Co(l - RR)(H 2 O)·H 2 O] ∞ [ 1 ; 1 - RR =(R,R)-噻唑烷-2,4-二羧酸酯]已被用于叔丁基氢过氧化物(t BuOOH )催化氧化不同烯烃(环己烯,(Z)-环辛烯,1-辛烯))或分子氧(O 2)作为氧化剂。观察到不同的化学选择性,取决于底物和氧化剂。在前手性前体的情况下,也获得了适度的对映选择性,这揭示了光学纯金属环境的手性诱导能力。的O的相互作用2与在暴露的金属位点1(材料预活化和随后除去协调水合配体之后)已经由非均相催化剂通过TPD-MS分析与DFT计算结合研究,以探测有效氧摄取的目的并在有氧条件下揭示催化氧化过程中活性物质的性质。理论结果指示η的存在1-超氧物种位于钴中心,并伴有Co(II)↔Co(III)氧化。最后,发现O 2吸附焓的实验估计与计算的结合能非常吻合。