From a mononuclear FeL2 complex to a Fe4L4 molecular square: Designed assembly and spin-crossover property
spin-crossover compound, molecular square, iron, coordination-directed self-assembly, supramolecular chemistry
By introduction of a new Fe(L1)2 spin-crossover (SCO) unit into the polynuclear system, a nano-scale Fe4(L2)4 molecular square architecture is designed through coordination-directed self-assembly strategy. Both the mononuclear Fe(L1)2 and tetranuclear Fe4(L2)4 complexes have been structurally confirmed by 1H nuclear magnetic resonance (NMR), electrospray ionization time-of-flight mass spectrometry (ESI-TOF-MS), and temperature-dependent single crystal X-ray diffraction studies. Variable-temperature magnetic susceptibility measurements reveal the presence of an abrupt SCO behavior with a thermal hysteresis width of 4 K for Fe(L1)2. By clear contrast, Fe4(L2)4 undergoes a gradual spin transition behavior with enlarged thermal hysteresis width and higher spin transition temperature.
Tsinghua University Press
Zhuo Wang, Li-Peng Zhou, Li-Xuan Cai, Chong-Bin Tian, Qing-Fu Sun. From a mononuclear FeL2 complex to a Fe4L4 molecular square: Designed assembly and spin-crossover property. Nano Research 2021, 14(2): 398-403.