Shioukhi Israa, Adi Langit Cahya, Dorcet Vincent, Cador Olivier, Rikken Geert L J A, Le Guennic Boris, Crassous Jeanne, Train Cyrille, Pointillart Fabrice, Atzori Matteo, Gidron Ori
Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem Edmond J. Safra Campus 9190401 Jerusalem Israel
Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS, Univ. Grenoble Alpes, INSA Toulouse, Univ. Toulouse Paul Sabatier, EMFL 38042 Grenoble France
Inorg Chem Front. 2025 May 8. doi: 10.1039/d5qi00832h.
Here we report on one-dimensional nano objects of formula [Yb(hfac)(-or -Ant-C8)] where the Ant-C8 moiety refers to enantiopure - and -twistacenes decorated at positions 2,6 with 4-pyridyl-ethynyl units and helically locked into an end-to-end twist by an octyl tether. The crystal structure analysis reveals intertwined 1D nano-chains featuring two crystallographically independent Yb(iii) ions. Under applied magnetic fields these systems show slow relaxation of the magnetization. The optical properties show the expected contributions of the F ← F electronic transition of the Yb(iii) ions split by the crystal field. Magnetic field and temperature dependent Magneto-Chiral Dichroism (MChD) studies reveal contributions of opposite sign and similar intensity for the two crystallographically independent ions that cancel out for the 0-0' and 0-2' absorptions but not for the 0-1'. These findings, supported by theoretical calculations, demonstrate the important role of the structural arrangement of MChD-active ions when designing chiral magneto-optical materials responsive to light and magnetic fields.
在此，我们报道了化学式为[Yb(hfac)(-或 -Ant-C8)]的一维纳米物体，其中Ant-C8部分指的是在2,6位用4-吡啶基乙炔基单元修饰的对映体纯的-和-扭曲并四苯，且通过一个辛基系链螺旋锁定成端对端的扭曲结构。晶体结构分析揭示了由两个晶体学独立的Yb(iii)离子构成的交织的一维纳米链。在施加磁场的情况下，这些体系表现出磁化强度的缓慢弛豫。光学性质显示了由晶体场分裂的Yb(iii)离子的F←F电子跃迁的预期贡献。磁场和温度依赖的磁手性二色性（MChD）研究表明，对于两个晶体学独立的离子，其贡献具有相反的符号和相似的强度，对于0-0'和0-2'吸收相互抵消，但对于0-1'吸收则不然。这些发现得到理论计算的支持，证明了在设计对光和磁场响应的手性磁光材料时，MChD活性离子的结构排列起着重要作用。
