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August 26, 2025Open Access

A Dy2 Complex Constructed by TCNQ·− Radical Anions with Slow Magnetic Relaxation Behavior

XWX.Y. WangNankai University SQSiji QinYanshan University XLXiulan LiUniversity of Electronic Science and Technology of China

Key Points

Weak magnetic relaxation was observed, suggesting specific interactions in the dinuclear complex.
The complex features ferromagnetic Dy-Dy interactions with a distance of 7.97 Å, likely enhancing dipolar effects.
Synthesis involved TCNQ·− radical anions and a Schiff base ligand, forming stable antiparamagnetic dimers.
This approach highlights how component interactions may influence magnetic properties in lanthanide complexes.

Abstract

A centrosymmetric dinuclear complex, Dy2(H2dapp)2(μ-OH)2(H2O)2·4TCNQ·2CH3OH, was synthesized using the TCNQ·− radical anion (TCNQ = 7,7,8,8-tetracyanoquino-dimethane) and pentadentate nitrogen-containing Schiff base ligand (H2dapp = 2,6-diacetylpyridine)-bis(2-pyridylhydrazone). In the Dy2 dimer, the two DyIII ions adopt eight-coordinated geometries intermediate between D4d and D2d symmetries, linked by two OH¯ groups, with ferromagnetic Dy-Dy interactions. The TCNQ·− radical anions are uncoordinated, and they pack tightly into antiparamagnetic dimers to balance the system charge. Under zero field, weak magnetic relaxation was observed, with an approximate Δeff = 2.82 K and τ0 = 6.88 × 10−6 s. This might be attributed to the short intermolecular Dy···Dy distance of 7.97 Å, which could enhance intermolecular dipolar interactions and quantum tunneling of magnetization (QTM).

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