Syntheses, Structures, and Magnetic Properties of Novel [3×1 + 2×1] Pentanuclear Zinc(II)-Lanthanide(III) Cocrystal Complexes: Slow Magnetic Relaxation Behavior of the Dy(III) Analogue

Ahmed, Naushad (2023) Syntheses, Structures, and Magnetic Properties of Novel [3×1 + 2×1] Pentanuclear Zinc(II)-Lanthanide(III) Cocrystal Complexes: Slow Magnetic Relaxation Behavior of the Dy(III) Analogue. Crystal Growth & Design, 23 (4). pp. 2218-2230. ISSN 1528-7483

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Abstract

A new family of 3d-4f polynuclear cocrystals [LnZn2L2(CH3CO2)4]·[Zn2Cl4L]·H2O [where LnIII = Gd(1), Tb(2), and Dy(3)] are synthesized by the sequential reaction of a tetradentate multisite coordinating compartmental ligand, i.e., (E)-2-methoxy-6-(((pyridine-2-ylmethyl)imino)methyl)phenol, in the presence of LnCl3·6H2O and Zn(OAc)2·2H2O. The detailed studies involve mainly synthesis, structure, and magnetic properties of three isostructural cocrystals. The X-ray diffraction analysis reveals that complexes 1-3 crystallize in triclinic crystal system with the P1̅ space group. The dimeric [Zn2Cl4L]− complex appears as a cocrystal in the vicinity of the [LnZn2L2(CH3CO2)4]+ crystal structure to counter balance the overall charge on the primary coordination sphere. Magnetic relaxation studies indicate that zero-field out-of-phase magnetic susceptibility signals are observed only for complex 3 (DyIII analogue) which gets well resolved in the presence of a Hdc = 0.5 kOe magnetic field. The extracted effective energy barrier (Ueff) and pre-exponential factor (τ0) for 3 is found to be 13.53 K and 1.78 × 10-6 s, respectively. The appearance of single-ion magnet properties for 3 is rationalized with CASSCF/SO-RASSI/SINGLE_ANISO based ab initio calculations.

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IITH Creators:

IITH Creators	ORCiD

Item Type:

Article

Uncontrolled Keywords:

Coordination reactions; Crystal structure; Dysprosium compounds; Magnetic susceptibility; Synthesis (chemical); X ray powder diffraction; Co-crystals; Compartmental ligands; Methoxy; Multi-site; Pentanuclear; Relaxation behaviors; Sequential reaction; Slow magnetic relaxations; Synthesised; Tetradentate; Zinc compounds

Subjects:

Chemistry
Chemistry > Inorganic chemistry

Divisions:

Department of Chemistry

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

13 Sep 2023 06:18

Last Modified:

13 Sep 2023 06:18

URI:

http://raiithold.iith.ac.in/id/eprint/11674