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Halogen Bonding between an Isoindoline Nitroxide and 1,4-Diiodotetrafluorobenzene: New Tools and Tectons for Self-Assembling Organic Spin Systems

机译:异吲哚啉氮氧化物和1,4-二碘四氟苯之间的卤素键:自组装有机自旋系统的新工具和构造子。

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摘要

The isoindoline nitroxide 1,1,3,3-tetramethylisoindolin-2-yloxyl (TMIO) and 1,4-diiodotetrafluorobenzene readily form a discrete 2:1 complex that shows evidence of relatively strong N-O-center dot center dot center dot center dot I halogen bonding. This interaction was characterized in the solid state by single-crystal X-ray analysis, thermal analysis, and vibrational spectroscopy (IR and Raman), backed by density functional theory calculations. EPR spectroscopy performed on a solution of TMIO in pentafluoroiodobenzene, a halogen-bonding donor, indicates that halogen bonding induces an increase in electron density at the nitroxide nitrogen nucleus and an increase in the nitroxide rotational correlation time. Our findings demonstrate the potential of utilizing halogen-bonding interactions to promote the self-assembly of new isoindoline nitroxide tectons for the preparation of organic spin systems.
机译:异吲哚啉氮氧化物1,1,3,3-四甲基异吲哚啉-2-基氧基(TMIO)和1,4-二碘四氟苯很容易形成离散的2:1络合物,显示出相对较强的NO中心点中心点中心点中心点I的证据卤素键。通过单晶X射线分析,热分析和振动光谱(IR和拉曼光谱),以密度泛函理论计算为后盾,以固态表征了这种相互作用。在五氟碘苯(一种卤素键供体)中的TMIO溶液上进行的EPR光谱表明,卤素键会引起一氧化氮氮核处电子密度的增加和一氧化氮旋转相关时间的增加。我们的发现证明了利用卤素键相互作用来促进新型异吲哚啉氮氧化物构造物自组装以制备有机自旋体系的潜力。

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