Sulfate-incorporated Co(II) coordination frameworks with bis-imidazole bridging ligands constructed by covalent and noncovalent interactions

Ji Hye Park, Woo Ram Lee, Dae Won Ryu, Kwang Soo Lim, Eun A. Jeong, Won Ju Phang, Eui Kwan Koh, Chang Seop Hong

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22 Citations (Scopus)

Abstract

Three 3D supramolecular networks, [Co(H 2L1) 2] •(SO 4)•2H 2O (1), [Co(H 2L1)(SO 4)(H 2O)(DMF)] (2), and [Co(H 2L2)(SO 4)(H 2O)] (3), were prepared by reacting Co(II) sulfate with the rigid bis-imidazoles of 1,4-di(1H-imidazol-4-yl)benzene (H 2L1) and 1,3-di(1H-imidazol-4-yl)benzene (H 2L2) in solvothermal conditions. Compounds 1 and 2 containing the H 2L1 ligand were isolated under different solvent-pair ratios. The structure of 1 can be described as a 6-fold interpenetrating 3D dia net in which the sulfate anions are positioned in the void spaces to balance the overall charge of the framework. In comparison, complex 2 shows a rectangular 2D grid consisting of 1D sulfate-bridged chains linked by H 2L1. When H 2L2 is used in the reaction, the complex 3 having a 3D interdigitaed network with helical chains is formed, which is the first example of an H 2L2-connected coordination polymer. The sulfate ions essentially contribute to the entanglement of the structures through extensive hydrogen bonding. Magnetic measurements for 2 indicate that very weak ferromagnetic interactions are operative between anisotropic Co(II) centers via sulfate bridges.

Original languageEnglish
Pages (from-to)2691-2698
Number of pages8
JournalCrystal Growth and Design
Volume12
Issue number5
DOIs
Publication statusPublished - 2012 May 2

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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