Study of intermolecular interaction for the spin-crossover iron(II) compounds

Shinya Hayami, Ryo Kawajiri, Gergely Juhász, Takayoshi Kawahara, Koichiro Hashiguchi, Osamu Sato, Katsuya Inoue, Yonezo Maeda

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21 Citations (Scopus)


The thermal spin transitions of iron(II) spin-crossover compounds [Fe(PM-iPA)2(NCS)2] (1) and [Fe(PM-iPA)2(NCSe)2] (2) (PM-iPA = N-(2′-pyridylmethyl)-isopropylamine) have occurred at T1/2 = 267 K and 376 K without thermal hysteresis. No light-induced excited spin state trapping (LIESST) effect was observed for compounds 1 and 2 even at 5 K. The iron(lI) spin-crossover compounds [Fe(PM-L)2(NCX)2] (PM-A = N-(2′-pyridylmethyl)-aniline, PM-BiA = N-(2′-pyridylmethyl)-4-aminobiphenyl, PM-TeA = N-(2′-pyridylmethyl)-4-aminoterphenyl, PM-PEA = N-(2′-pyridylmethyl))-4-(phenylethynyl)aniline, and PM-AzA = N-(2′-pyridylmethyl)-4-(phenylazo)aniline; X = S and Se) with ligands having π-systems have exhibited the LIESST effect, and the critical LIESST temperature, Tc(LIESST), has been observed. The compounds 1 and 2 are crystallized at Pnna and C2/c at 298 K, respectively, and the space groups of the compounds remained unchanged until 100 K, although the compounds show the spin transition. The molecular packing structure and thermodynamic parameters of the spin transitions calculated from the magnetic susceptibility curves suggest that compounds 1 and 2 have no strong intermolecular interactions between the complexes, while the compounds with π-system ligands form π-π intra- and intermolecular interactions between the ligands. Our conclusion is that the intermolecular interactions play an important role in trapping a light-induced metastatble state.

Original languageEnglish
Pages (from-to)1207-1213
Number of pages7
JournalBulletin of the Chemical Society of Japan
Issue number6
Publication statusPublished - Jun 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)


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