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![Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59399.jpg&w=3840&q=50)
Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
Published on: September 13, 2019
Magnetic field and dilution effects on the slow relaxation of {Er3} triangle-based arsenotungstate single-molecule
Hanhan Chen1, Lin Sun, Jinpeng Zhang
1Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, P. R. China. mpt@henu.edu.cn jyniu@henu.edu.cn.
Abstract:
A triangular {Er3} cluster containing polyoxometalate (POM), [Er3(μ3-OH)(H2O)8(AsW9O33)(AsW10O35(dl-mal))]222- (1) (mal = malate), has been obtained via one-pot reactions. Structural analyses demonstrate that three Er3+ ions bridged one μ3-OH to generate a rare μ3-OH-capped triangular {Er3} cluster, which connects two different vacant polyanions to form an unsymmetrical sandwich-type subunit, and adjacent sandwiched subunits are linked through mal ligands to give the targeted dimer. When the Er3+ ions are substituted in whole or in part with Y3+ ions, the diamagnetic yttrium analogue [Y3(μ3-OH)(H2O)8(AsW9O33)(AsW10O35(dl-mal))]222- (2) and diluted sample [Er0.15Y2.85(μ3-OH)(H2O)8(AsW9O33)(AsW10O35(dl-mal))]222- (Er@2) have also been synthesized. Magnetic studies reveal that 1 exhibits field-induced two-step magnetic relaxation processes; the slow relaxation process may arise from intramolecular magnetic interactions, whereas the fast one is likely to originate from the intermolecular dipole-dipole interactions supported by the magnetic results of Er@2. From ab initio calculations, it is found that although the magnetic anisotropies of 1 mainly originate from individual Er3+ fragments, the Er3+-Er3+ interactions have a considerable influence on their slow magnetic relaxation processes.
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