Homo- and heterometallic coordination networks based on linear trinuclear Co(ii) units: Syntheses, structures and magnetic properties

Wun Jhih Huang, Chia Ju Hsu, Shao Kang Tsai, Hsiu Yi He, Jaw Jih Ding, Ting Wei Hsu, Chun Chuen Yang, Jhy Der Chen

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Two three-dimensional (3D) coordination networks, [Co3(1,4-BDC)3(L1)] (L1 = N,N′-bis(3-pyridinyl)-1,4-benzenedicarboxamide; 1,4-H2BDC = 1,4-benzenedicarboxylic acid), 1, and [K2Co3(L2)4] (H2L2 = 5-acetamidoisophthalic acid), 2, have been synthesized by hydrothermal reactions and characterized by single crystal X-ray crystallography. Complex 1 consists of linear trinuclear Co(ii) centers, which are linked by the 1,4-BDC- and L1 ligands to form a rare (1 + 3) self-catenated 3D net with the new (36,410,511,6) topology, and complex 2 reveals a 3p-3d heterometallic coordination network based on linear trinuclear Co(ii) and dinuclear K(i) centers bridged by the μ6-L2 ligands, forming a 4,4,8-connected trinodal net with the new (414·610·84)(42·64)(44·62) topology. The linear trinuclear Co(ii) centers in 1 adopt the square pyramidal-octahedral-square pyramidal geometries, whereas those in 2 are tetrahedral-octahedral-tetrahedral. Both of the complexes exhibit paramagnetism that is consistent with the Curie-Weiss law between 60 and 300 K. The effective magnetic moments (〈μeff〉) of both complexes are larger than the estimated value of 6.71 μB/f.u., revealing the spin-orbit couplings that are invoked by the different distorted geometries of the linear trinuclear Co(ii) centers. The dinuclear K(i) centers in 2 weaken the magnetic coupling, and reduce the antiferromagnetic ordering at 6 K.

Original languageEnglish
Pages (from-to)23374-23382
Number of pages9
JournalRSC Advances
Volume5
Issue number30
DOIs
StatePublished - 2015

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