High performance near-infrared photodetectors based on ultrathin SnS nanobelts grown via physical vapor deposition, showing a high responsivity of 300 A W−1 and a fast decay time of 7 ms.
Abstract:The pentagonal bipyramidal single-ion magnets (SIMs) are among the most attractive prototypes of high performance single-molecule magnets (SMMs). Here we introduced the fluorescence-active phosphine oxide ligand, combing the dynamic magnetic measurement, optical characterization and ab initio calculation, firstly studied the magneto-optical correlation of a highperformance pseudo-D5h Dy(III) SIM with large Ueff = 508(2) K and high magnetic hysteresis temperature of 19 K, [Dy(CyPh2PO)2(H2O)5]Br3· 2(CyPh2PO)· EtOH· 3H2O (CyPh2PO = cyclohexyl(diphenyl)phosphine oxide). This work shall provide a deeper insight into the rational design of promising molecular magnets.
We investigate a family of dinuclear dysprosium metallocene single‐molecule magnets (SMMs) bridged by methyl and halogen groups [Cp′2Dy(μ‐X)]2 (Cp′=cyclopentadienyltrimethylsilane anion; 1: X=CH3−; 2: X=Cl−; 3: X=Br−; 4: X=I−). For the first time, the magnetic easy axes of dysprosium metallocene SMMs are experimentally determined, confirming that the orientation of them are perpendicular to the equatorial plane which is made up of dysprosium and bridging atoms. The orientation of the magnetic easy axis for 1 deviates from the normal direction (by 10.3°) due to the stronger equatorial interactions between DyIII and methyl groups. Moreover, its magnetic axes show a temperature‐dependent shifting, which is caused by the competition between exchange interactions and Zeeman interactions. Studies of fluorescence and specific heat as well as ab initio calculations reveal the significant influences of the bridging ligands on their low‐lying exchange‐based energy levels and, consequently, low‐temperature magnetic properties.
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