Here we report on one-dimensional nano objects of formula[Yb(hfac)_(3)(M-or P-Ant-C8)]_(n) where the Ant-C8 moiety refers to enantiopure M-and P-twistacenes decorated at positions 2,6 with 4-pyridyl-ethynyl units and ...Here we report on one-dimensional nano objects of formula[Yb(hfac)_(3)(M-or P-Ant-C8)]_(n) where the Ant-C8 moiety refers to enantiopure M-and P-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 ^(2)F_(7/2)←^(2)F_(5/2) 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 ab intio 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.展开更多
基金The French National Research Agency(ANR)is acknowledged for financial support through the SWITCH-MChD(ANR-23-CE07-0003)PRINCIPE(ANR-23-CE07-0015)projects+2 种基金This project has received financial support from the CNRS through the MITI interdisciplinary programs through its exploratory research programThe French GENCI/IDRIS-CINES centers for high-performance computing resources are also acknowledged.O.G.acknowledges European Union's Horizon 2020 research and innovation program(grant agreement no.850836,ERC Starting Grant“PolyHelix”)the Israel Science Foundation(grant no.3085/21).
文摘Here we report on one-dimensional nano objects of formula[Yb(hfac)_(3)(M-or P-Ant-C8)]_(n) where the Ant-C8 moiety refers to enantiopure M-and P-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 ^(2)F_(7/2)←^(2)F_(5/2) 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 ab intio 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.
