Photoswitching of the Magnetic Interaction between a Copper(II) Ion and a Nitroxide Radical by Using a Photochromic Spin Coupler
作者:Kohsuke Takayama、Kenji Matsuda、Masahiro Irie
DOI:10.1002/chem.200305154
日期:2003.11.21
Photoswitching of an intramolecular spin exchange interaction between a copper(II) ion and a nitroxyl radical by using a metal complex of diarylethene has been studied by means of ESR spectroscopy. As a coordination ligand, a diarylethene with a 1,10-phenanthroline ring and nitronyl nitroxide radical was synthesized. Mixing the diarylethene ligand with [Cu(hfac)(2)] (hfac=hexafluoroacetylacetone) in
通过ESR光谱研究了通过使用二芳基乙烯的金属络合物对铜(II)离子与硝基氧基之间的分子内自旋交换相互作用的光开关。作为配位体,合成了具有1,10-菲咯啉环和硝酰基硝基氧自由基的二芳基乙烯。将二芳基乙烯配体与[Cu(hfac)(2)](hfac =六氟乙酰丙酮)在甲苯中混合会导致由于络合而导致闭环异构体的最大吸收峰发生色变。Cu(II)配合物的开环异构体在室温下在甲苯中进行ESR测量,得出的光谱是氮氧自由基和Cu(II)光谱的叠加。当样品以366 nm的光照射时,由于硝氧基自由基和Cu(II)之间的交换作用较大,出现了一个新的峰。此ESR测量表明,自旋交换相互作用的强度通过光辐照改变了160倍以上。这是二芳基乙烯系统中记录的最大磁性光开关现象。