Aggregation Effects in Visible-Light Flavin Photocatalysts: Synthesis, Structure, and Catalytic Activity of 10-Arylflavins
作者:Jitka Daďová、Susanne Kümmel、Christian Feldmeier、Jana Cibulková、Richard Pažout、Jaroslav Maixner、Ruth M. Gschwind、Burkhard König、Radek Cibulka
DOI:10.1002/chem.201202488
日期:2013.1.14
6′‐diethylphenyl)‐, 10‐(2′,6′‐diisopropylphenyl)‐, 10‐(2′‐tert‐butylphenyl)‐, and 10‐(2′,6′‐dimethylphenyl)‐3‐methylisoalloxazine (2 a–f)) was prepared as potentially nonaggregating flavin photocatalysts. The investigation of their structures in the crystalline phase combined with 1H‐DOSY NMR spectroscopic experiments in CD3CN, CD3CN/D2O (1:1), and D2O confirm the decreased ability of 10‐arylflavins 2 to form
一系列10-芳基黄素(10-苯基-,10-(2',6'-二甲基苯基)-,10-(2',6'-二乙基苯基)-,10-(2',6'-二异丙基苯基)-制备了10-(2'-叔丁基苯基)-和10-(2',6'-二甲基苯基)-3-甲基异恶嗪(2 a – f))作为潜在的非聚集黄素光催化剂。它们的结构在结晶阶段调查具有组合1 H-DOSY NMR光谱在CD实验3 CN,CD 3 CN / d 2,和d:O(1 1)2 ö确认的10 arylflavins的能力降低2至相对于四-O-乙酰核黄素(1)形成聚集体。10-芳基黄素2 a – d不会通过π-π相互作用进行相互作用,而π-π相互作用则受与异四恶嗪骨架垂直取向的10-苯环的限制。在另一方面,N3 在其晶体结构中检测到H⋅⋅⋅O氢键。在10 -芳基-3- methylflavin(结构2 F)与取代N3位置,弱Ç H⋅⋅⋅O键和弱π-π相互作用被