A single-ion magnet building block strategy toward Dy2 single-molecule magnets with enhanced magnetic performance

Shao, Dong and Sahu, Prem Prakash and Singh, Saurabh Kumar and et al, . (2022) A single-ion magnet building block strategy toward Dy2 single-molecule magnets with enhanced magnetic performance. Dalton Transactions, 51 (18610). pp. 1-12. ISSN 1477-9226

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Abstract

A molecular dysprosium(iii) complex [Dy(DClQ)3(H2O)2] (1) was used as a building unit for the construction of lanthanide SMMs, leading to the isolation of two dinuclear Dy(iii) complexes, namely [Dy2(DClQ)6(MeOH)2] (2) and [Dy2(DClQ)6(bpmo)2]·6MeCN (3) (DClQ = 5,7-dichloro-8-hydroxyquinoline, bpmo = 4,4′-dipyridine-oxide). Structural analyses revealed the same N3O5 coordination environment of the Dy(iii) centers with a distorted biaugmented trigonal prism (C2V symmetry) and triangular dodecahedron (D2d symmetry) for 2 and 3, respectively. Magnetic studies revealed the presence of ferromagnetic and weak antiferromagnetic exchange interactions between the Dy3+ centers in 2 and 3, respectively. Interestingly, slow relaxation of magnetization at zero fields was evidenced with an Ueff of 51.4 K and 159.0 K for complexes 2 and 3, respectively. The detailed analysis of relaxation dynamics discloses that the Orbach process is dominant for 2 whereas Raman and QTM play an important role in 3. Theoretical calculations were carried out to provide insight into the magnetic exchange interactions and relaxation dynamics for the complexes. Due to a single-ion magnet (SIM) of 1, the foregoing results demonstrate a SIM modular synthetic route for the preparation of dinuclear lanthanide SMMs. © 2022 The Royal Society of Chemistry.

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IITH Creators:

IITH Creators	ORCiD
Singh, Saurabh Kumar	https://orcid.org/0000-0001-9488-8036

Item Type:

Article

Additional Information:

This work was supported by a start-up fund from Huanggang Normal University (No. 2042021033, 202210204), the Young Talents Project of Department of Education of Hubei Province (Q20222904), and the Open Foundation of State Key Laboratory of Coordination Chemistry (No. SKLCC2208). SKS and PPS acknowledge the Department of Science and Technology for the Start-up Research Grant (SRG/2020/001323). SKS thanks IIT Hyderabad for generous funding. The support and resources provided by PARAM Shivay Facility under the National Supercomputing Mission, Government of India at the Indian Institute of Technology, Varanasi, are gratefully acknowledged. SKS also acknowledges Prof. Gopalan Rajaraman at IIT Bombay, for providing the MOLCAS 8.2 code. XQW thanks the Doctoral Fund of Jinzhong University (No. jzxybsjjxm2019020). The National Key R&D Program of China (2018YFA0306002) and the National Natural Science Foundation of China (21973039, 21973046) are also acknowledged. We also thank Dr Yue Zhao from Nanjing University for his kind help on the structural refinement.

Uncontrolled Keywords:

single-ion,Dy2 single-molecule magnets,magnetic performance.

Subjects:

Chemistry

Divisions:

Department of Chemistry

Depositing User:

Ms Palak Jain

Date Deposited:

19 May 2023 11:59

Last Modified:

19 May 2023 11:59