Slow magnetic relaxation in high-coordinate Co(II) and Fe(II) compounds bearing neutral tetradentate ligands

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
View graph of relations

Author(s)

  • Min Peng
  • Xiao-Fan Wu
  • Li-Xin Wang
  • Si-Huai Chen
  • Jing Xiang
  • Xin-Xin Jin
  • Shek-Man Yiu
  • Bing-Wu Wang
  • Song Gao

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)15327-15335
Journal / PublicationDalton Transactions
Volume50
Issue number42
Online published12 Oct 2021
Publication statusPublished - 14 Nov 2021

Abstract

The first-row transition metal compounds, [MII(L1)2](ClO4)2 (M = Ni (1); Co (2)), have been prepared by treatment of a neutral tetradentate ligand (L1 = N2,N9-dibutyl-1,10-phenanthroline-2,9-dicarboxamide) with metal perchlorate salts in MeOH. Both compounds have been structurally characterized by X-ray crystallography and it was found that the coordination numbers are 6 and 7, respectively. The reaction of 6,6'-bis(2-tbutyl-tetra-zol-5-yl)-2,2'-bipyridine (L2) with hydrated FeII(ClO4)2 afforded a 8-coordinate Fe(II) compound, [FeII(L2)2] (ClO4)2 (3); however its reaction with hydrated CoII(ClO4)2 resulted in 6-coordinate [CoII(L2)2](ClO4)2. it is interesting to observe field-induced slow magnetic relaxation in the 7-coordinate Co(II) compound 2 and 8-coordinate Fe(II) compound 3, which further supports the validity of designing high coordination number compounds as single-molecule magnets. Direct current magnetic studies demonstrate that 2 has a very large positive D value (56.2 cm-1) and a small E value (0.66 cm-l), indicating easy plane magnetic anisotropy. Consistent with the larger D value, an effective spin-reversal barrier of Ueff = 100 K (714 cm-1) is obtained, which is the highest value reported for 7-coordinate Co(II) complexes with a pentagonal bipyramidal geometry. In contrast, 8-coordinate Fe(II) compound 3 exhibits uniaxial magnetic anisotropy.

Research Area(s)

  • SINGLE-ION-MAGNET, MONONUCLEAR 8-COORDINATE FE(II), CO-II, MOLECULE MAGNET, ZERO-FIELD, COBALT(II) COMPLEXES, ELECTRONIC-STRUCTURE, FE-II, 2-COORDINATE, ANISOTROPY

Citation Format(s)

Slow magnetic relaxation in high-coordinate Co(II) and Fe(II) compounds bearing neutral tetradentate ligands. / Peng, Min; Wu, Xiao-Fan; Wang, Li-Xin; Chen, Si-Huai; Xiang, Jing; Jin, Xin-Xin; Yiu, Shek-Man; Wang, Bing-Wu; Gao, Song; Lau, Tai-Chu.

In: Dalton Transactions, Vol. 50, No. 42, 14.11.2021, p. 15327-15335.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review