Assessing the Impact of Electronic and Steric Tuning of the Ligand in the Spin State and Catalytic Oxidation Ability of the Fe<sup>II</sup>(Pytacn) Family of Complexes
has been assayed in catalytic C–H and C═C oxidation reactions with H2O2. These catalysts exhibit excellent efficiency in the stereospecific hydroxylation of alkanes and in the oxidation of olefins. Remarkably, R′-substituents have little influence on the efficiency and chemoselectivity of the catalytic activity of the complexes, but the selectivity toward olefin cis-dihydroxylation is enhanced for complexes
catalysts for efficient and selective alkene oxidation (epoxidation and cis‐dihydroxylation) employing hydrogenperoxide as oxidant. Complex [Fe(II)(Me,Me,HPyTACN)(CF3SO3)2] (7), was identified as the most efficient and selective cis‐dihydroxylation catalyst among the family. The high activity of 7 allows the oxidation of alkenes to proceed rapidly (30 min) at room temperature and underconditions where the
通式为[Fe(II)(R,Y,X PyTACN)(CF 3 SO 3)2 ]的铁络合物家族,其中R,Y,X PyTACN = 1‐ [2′‐(4‐Y‐6 -[X-吡啶基)甲基] -4,7-二烷基-1,4,7-三氮杂环壬烷,X和Y分别表示吡啶的4和6位上的基团,R表示在N-处的烷基取代基三氮杂双环壬烷环的4和N-7被证明是使用过氧化氢作为氧化剂进行有效且选择性的烯烃氧化(环氧化和顺式-二羟基化)的催化剂。络合物[Fe(II)(Me,Me,H PyTACN)(CF 3 SO 3)2 ](7)被认为是该家族中最有效和选择性最强的顺式-二羟基化催化剂。7的高活性使烯烃的氧化在室温下以及在不大量使用烯烃而仅是限制性试剂的条件下迅速进行(30分钟)。在3%(摩尔)的存在下7,2当量。H 2 O 2作为氧化剂,当量为15当量。在乙腈溶液中,水被烯烃顺式-二羟基化,其收率可能对于合成目的是令人感兴趣的。竞
Understanding light-driven H<sub>2</sub> evolution through the electronic tuning of aminopyridine cobalt complexes
作者:Arnau Call、Federico Franco、Noufal Kandoth、Sergio Fernández、María González-Béjar、Julia Pérez-Prieto、Josep M. Luis、Julio Lloret-Fillol
DOI:10.1039/c7sc04328g
日期:——
Electronic effects provide a general mechanistic scenario for rationalizing photocatalytic water reduction activity with aminopyridine cobalt complexes.