Cyano-bridged pentanuclear and honeycomblike MIIICuII (M = Fe, Cr) bimetallic assemblies: Structural variations modulated by side groups of macrocyclic ligands and magnetic properties

Jeong Hak Lim, Jung Hee Yoon, Sang Yup Choi, Dae Won Ryu, Eui Kwan Koh, Chang Seop Hong

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Three two-dimensional (2D) layered M(III)-Cu(II) (M = Fe, Cr) bimetallic complexes and a discrete cluster were prepared using [M(CN)6] 3- and respective Cu macrocycles with methyl (1, 3) or ethyl (2, 4) side groups. The crystal structures can be described as aesthetic honeycomb-like M2Cu3 neutral sheets (1, 3, 4) and a pentanuclear Fe 2Cu3 entity (2) with an isolated Cu(L2)2+ moiety. The steric hindrance induced by the pendant groups renders the internal parameters of the Cu-Nax (where the "ax" subscript denotes axial) length and Cu-Nax-Cax angle to become elongated and acute. The magnetic data disclose that ferromagnetic couplings are transmitted between M(III) and Cu(II) ions through the CN links. For 4, particularly, there is a magnetically defined chain (Jc) composed of dimers (J d) and trimers (Jt), based on the structural considerations. The intramolecular magnetic coupling constants are Jd = 3.73 cm-1 and Jt = 4.08 cm-1, while the Jc value corresponds to 0.17 cm-1. From a magnetostructural point of view, it is reasoned that the Cu-Nax bond length is probably a determining factor of the strength of magnetic couplings in 4.

Original languageEnglish
Pages (from-to)1749-1757
Number of pages9
JournalInorganic Chemistry
Volume50
Issue number5
DOIs
Publication statusPublished - 2011 Mar 7

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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