Jin Xiong

Enhanced magnetic anisotropy in a tellurium-coordinated cobalt single-ion magnet

A series of tetrahedral Co(II) complexes with chalcogen donors were prepared, which exhibited strong magnetic uniaxial anisotropies and slow relaxations as SIMs. By substituting donors from S to Te, we realized the fine-tuning of the ligand field while keeping the coordination geometry virtually unchanged, yielding the first tellurium-coordinated SIM.

Endohedral Metallofullerene as Molecular High Spin Qubit: Diverse Rabi Cycles in Gd2@C79N

An anisotropic high-spin qubit with long coherence time could scale the quantum system up. It has been proposed that Grovers algorithm can be implemented in such systems. Dimetallic aza[80]fullerenes M2@C79N (M = Y or Gd) possess an unpaired electron located between two metal ions, offering an opportunity to manipulate spin(s) protected in the cage for quantum information processing. Herein, we report the crystallographic determination of Gd2@C79N for the first time. This molecular magnet with a collective high-spin ground state (S = 15/2) generated by strong magnetic coupling (JGd-Rad = 350 ± 20 cm-1) has been unambiguously validated by magnetic susceptibility experiments. Gd2@C79N has quantum coherence and diverse Rabi cycles, allowing arbitrary superposition state manipulation between each adjacent level. The phase memory time reaches 5 μs at 5 K by dynamic decoupling. This molecule fulfills the requirements of Grovers searching algorithm proposed by Leuenberger and Loss.

Modulating Slow Magnetic Relaxation of Dysprosium Compounds through the Position of Coordinating Nitrate Group

A chain complex [Dy(L)(NO3)2CH3OH]n (1) and a dinuclear compound [Dy2(L)2(NO3)4(CH3OH)2]·2CH3OH (2) were synthesized by the assembly of a novel pyridine-N-oxide-containing ligand with dysprosium nitrate under different reaction temperatures, where two coordinating nitrates are located in para or ortho position with respect to each other around dysprosium ions. Magnetic studies indicate that the chain complex with two para-coordinating nitrates shows fast quantum tunnelling of the magnetization under zero direct-current field, while the dinuclear complex with two ortho-coordinating nitrates exhibits a thermal-activated process with an effective energy barrier of 51 K. Theoretical and magneto-structural correlation studies indicate that position change of coordinating nitrates can significantly modulate the crystal field around dysprosium ion and further lead to their different relaxation behaviors.

Correction to “Endohedral Metallofullerene as Molecular High Spin Qubit: Diverse Rabi Cycles in Gd2@C79N”

Page 1125. Near the end of the section on “Energy Spectrum” and in the caption of Figure 2a, the parameters of spin Hamiltonian were reported incorrectly. The parameters should be B2 0 = 0.32(2) GHz, B2 2 = 0.14(1) GHz, B4 0 = −6(3) × 10−5 GHz, and giso = 1.99. The ZFS strain should be StrB20 = 0.02 GHz and StrB22 = 0.045 GHz. The main conclusions associated with these parameters are unaffected by these changes. Addition/Correction

Rational construction of a porous lanthanide coordination polymer featuring reversible guest-dependent magnetic relaxation behavior

A new three-dimensional porous lanthanide coordination polymer {[Dy(L)(μ2-bpdo)0.5(μ4-bpdo)0.5(CH3OH)]·ClO4·3CH3OH}n (2) featuring slow magnetic relaxation has been successfully assembled by reacting a superparamagnetic chain complex{[Dy(HL)(H2O)2(CH3OH)2]·2Cl·CH3OH}n (1) with an organic bridging ligand, namely, 4,4′-bipyridine-N,N′-dioxide (bpdo) (H2L = N′-(2-hydroxybenzylidene)-picolinohydrazide). Compared with 1, complex 2 has a higher magnetic anisotropy barrier, which arises from the variation of the ligand field around dysprosium ions and/or the existence of magnetic coupling between them induced by the bpdo ligand, leading to a thermal magnetic relaxation process through the second-excited doublet. Interestingly, complex 2 can undergo a reversible single-crystal-to-single-crystal conversion accompanying the desorption and adsorption of methanol molecules. The de-solvated phase, {[Dy(L)(μ2-bpdo)0.5(μ4-bpdo)0.5(CH3OH)]·ClO4}n (3), exhibits a slow magnetic relaxation process through the first-excited doublet, presenting the first example of reversible adjustment on the magnetic relaxation pathway regulated by guest molecules. This exciting finding offers a new perspective for enhancing the magnetic relaxation barrier.