Three-dimensional 3d-4f hetero-bimetallic coordination polymers through hydrogen bonds: Synthesis, structures and Mössbauer spectrum analysis

Guangming Li, Takashiro Akitsu, Osamu Sato, Yasuaki Einaga

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15 Citations (Scopus)

Abstract

Four cyano-bridged 3d-4f hetero-bimetallic Ln(III)-Fe(III) assemblies, {[Ln(DMF)4(H2O)3(μ-CN)Fe(CN)5] · H2O)n (Ln = Ce (1), Nd (2), Sm (3) and Gd (4); DMF = N,N-dimethylformamide), have been synthesized. X-ray crystallographic analysis of both 3 and 4 reveals three-dimensional network structures resulting from hydrogen bonds in the crystals. With respect to the coordination number on Sm(III) atoms, 3 is different from previously reported structures. Structural comparison indicates that the differences in magnetic properties between 3 and 4 do not derive from structural factors. Mössbauer spectra at both 298 and 10 K reveal that the characteristic quadrupole splitting for low-spin Fe(III) ions (S = 1/2) remains unchanged, indicating that the spin state of Fe(III) ions in 1-4 is not affected by temperature. The magnetic anisotropy derived from the ground states of Ln(III) ions with odd 4fn electrons (n = 1, 3, 5 and 7), 2F5/2, 4I9/2, 6H5/2 and 8S7/2 for Ce(III), Nd(III), Sm(III) and Gd(III), respectively, dominates the exchange interaction in the Ln(III)-NC-Fe(III) systems.

Original languageEnglish
Pages (from-to)855-864
Number of pages10
JournalJournal of Coordination Chemistry
Volume57
Issue number10
DOIs
Publication statusPublished - 2004 Jul 10

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Keywords

  • 3d-4f complex
  • Crystal structures
  • Cyano-bridged
  • Mössbauer spectra
  • Synthesis

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry

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