Issue 21, 2022

Tuning chain topologies and magnetic anisotropy in one-dimensional cobalt(ii) coordination polymers via distinct dicarboxylates

Abstract

Based on a terpyridine derivative and two different dicarboxylate ligands, two new cobalt(II) coordination polymers, namely [Co(pytpy)(DClbdc)]n (1) and [Co(pytpy)(ndc)]n (2) (pytpy = 4′-(4-pyridyl)-2,2′:6′,2′′-terpyridine, H2DClbc = 2,5-dichloroterephthalic acid, and H2ndc = 2,6-naphthalenedicarboxylic acid), were hydrothermally synthesized and characterized structurally and magnetically. Single-crystal X-ray diffraction revealed that 1 and 2 are one-dimensional (1D) linear and zigzag chain complexes, respectively, with the Co2+ centers located in a compressed and an elongated bipyramid of 1 and 2, respectively. Magnetic investigation revealed that the chain complexes exhibit distinct easy-axis and easy-plane magnetic anisotropy with D = −95.6 and −42.8 cm−1 for 1 and 2, respectively. The inverse magnetic anisotropy of 1 and 2 was further confirmed and understood using ab initio calculations. Interestingly, field-induced single-ion magnet (SIM) behaviors were evidenced at low temperatures with the effective energy barrier of Ueff = 27.3 and 12.7 cm−1 for 1 and 2, respectively. The foregoing results provide not only a way for the construction of 1D cobalt(II) coordination polymers with slow magnetic relaxation behavior but also a chance to tune chain topologies and magnetic anisotropy in one-dimensional coordination polymers via different dicarboxylates.

Graphical abstract: Tuning chain topologies and magnetic anisotropy in one-dimensional cobalt(ii) coordination polymers via distinct dicarboxylates

Supplementary files

Article information

Article type
Paper
Submitted
30 Mar 2022
Accepted
16 Apr 2022
First published
02 May 2022

CrystEngComm, 2022,24, 3928-3937

Tuning chain topologies and magnetic anisotropy in one-dimensional cobalt(II) coordination polymers via distinct dicarboxylates

Z. Tian, S. Moorthy, H. Xiang, P. Peng, M. You, Q. Zhang, S. Yang, Y. Zhang, D. Wu, S. K. Singh and D. Shao, CrystEngComm, 2022, 24, 3928 DOI: 10.1039/D2CE00437B

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