Synthesis, Crystal Structure, Luminescent and Magnetic Properties of Pyridyl Phenyl Substituted Nitronyl Nitroxide Radical-MnII-LnIII Tetranuclear Clusters

Abstract

Abstract: 5-(4-pyridyl) phenyl substituted functionalized nitronyl nitroxide biradical ligand holds Mn^II ions and Tb^III/Ho^III ions together to yield 3d-4f-biradical heterospin clusters, namely, [Ln₂Mn₂(hfac)₁₀(NITPhPybis)₂] [Ln=Tb 1, Ho 2], wherein, two NITPhPybis radicals ligate two Mn^II ions via two NO groups and two nitrogen-atoms from pyridine rings. At the same time, each NITPhPybis encapsulates one Ln^III ion through chelating mode with adjacent NO groups, generating an annular centrosymmetric heterometallic tetranuclear system. In addition, the direct current and alternating current magnetic properties and luminescent behavior were systematically studied. Magnetodynamic studies uncover that the cluster 1-TbMn exhibits slow magnetic relaxation. The fluorescence of two polynuclear clusters show the characteristic fluorescence of Tb^III or Ho^III ions.

Key words: nitronyl nitroxide biradical, heterospin complex, lanthanide, transition metal, self-assembly, coordination reaction

CLC Number:

O641.4

LI Baoyi, HE Min, LI Hongdao. Synthesis, Crystal Structure, Luminescent and Magnetic Properties of Pyridyl Phenyl Substituted Nitronyl Nitroxide Radical-Mn^II-Ln^III Tetranuclear Clusters[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(10): 1769-1775.

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Synthesis, Crystal Structure, Luminescent and Magnetic Properties of Pyridyl Phenyl Substituted Nitronyl Nitroxide Radical-Mn^II-Ln^III Tetranuclear Clusters

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