Synthesis, Characterization, and Properties of Iron(II) Spin-Crossover Molecular Photoswitches Functioning at Room Temperature
作者:Max Mörtel、Alexander Witt、Frank W. Heinemann、Sebastian Bochmann、Julien Bachmann、Marat M. Khusniyarov
DOI:10.1021/acs.inorgchem.7b01952
日期:2017.11.6
Spin-crossover molecular switches [FeII(H2B(pz)2)2L] (L = novel phenanthroline-based ligands featuring photochromic diarylethene units; pz = 1-pyrazolyl) were synthesized and thoroughly characterized by variable-temperature X-ray crystallography, Mössbauer spectroscopy, and magnetic measurements. The effect of substituents introduced into the phenanthroline backbone (L2) and into the photochromic diarylethene
合成了自旋交叉分子开关[Fe II(H 2 B(pz)2)2 L ](L =具有光致变色二芳基乙烯单元的新型基于菲咯啉的配体; pz = 1-吡唑基),并通过可变温度X-射线晶体学,穆斯堡尔光谱法和磁测量。引入菲咯啉主链(L2)和光致变色二芳基乙烯单元(L3)的取代基对无金属配体和自旋交叉铁(II)配合物2和3的光物理性质的影响分别进行了详细调查。在室温下,溶液中的配体和配合物都可以在光线下转换。2的光环化伴随着高旋转到低旋转的光转换,确定为19%。L3和3的闭环异构体的寿命在数分钟范围内,而L2和2的闭环异构体的寿命在数分钟范围内。在室温下在溶液中可保持数天的热稳定性。通过避免光稳态,可以改善光开关的可逆性。向菲咯啉主链上引入锚定基团可能会允许构建自旋交联物种的化学吸附自组装单分子层,该单分子层可在室温下用光切换。