Preparation of Copper Ion Complexes of Sterically Congested Diaryldiazomethanes Having a Pyridine Ligand and Characterization of Their Photoproducts
作者:Tetsuji Itoh、Masayoshi Matsuno、Eiko Kamiya、Katsuyuki Hirai、Hideo Tomioka
DOI:10.1021/ja0424225
日期:2005.5.1
zomethane (2,7-DPy-1-N(2)). The triplet carbene DPy-(3)1 generated by photolysis of DPy-1-N(2) was characterized by ESR and UV-vis spectroscopy in a matrix at low temperature as well as by time-resolved UV-vis in solution at room temperature. The results showed that the triplet carbene DPy-(3)1 was destabilized to some extent as opposed to the parent triplet carbene before pyridination, but it was
结果表明,三线态卡宾 DPy-(3)1 与吡啶化前的母体三线态卡宾相比在一定程度上不稳定,但它仍然相当持久,室温下在溶液中的半衰期超过 30 分钟. DPy-1-N(2) 和 Cu(hfac)(2) 复合物的光产物以类似的方式表征,结果表明生成的卡宾中心与 Cu(II) 离子发生磁性相互作用,形成高-具有显着热稳定性的自旋物种。没有观察到由于分离的三重卡宾 DPy-(3)1 引起的显着信号的事实表明,在这些低温条件下,吡啶部分以几乎定量的方式与 Cu(hfac)(2) 结合。使用超导量子干涉装置 (SQUID) 磁/感受计对光产物进行磁性测量,以确定复合物的自旋状态。摩尔顺磁化率的温度依赖性表明存在铁磁相互作用。使用 M 与 H/T 图表示的复合物磁化强度的场相关性根据双分量布里渊函数进行分析,S = 3.18 (F = 0.66) 和 S = 0.02 (F = 0.23) 2,7-DPy-1