Investigation of nitro-nitrito photoisomerization: Crystal structures of trans-{2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato}(pyridine/4-methylpyridine)nitrocobalt(III)

Shigeru Ohba, Masanobu Tsuchimoto, Naoki Yamada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The reaction cavities of the nitro groups in the title compounds, trans-{2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato-κ4 O,N,N′,O′}(nitro-κN)(pyridine-κN)cobalt(III), [Co(C16H14N2O2)(NO2)(C5H5N)], (I), and trans-{2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato-κ4 O,N,N′,O′}(4-methylpyridine-κN)(nitro-κN)cobalt(III), [Co(C16H14N2O2)(NO2)(C6H7N)], (II), have been investigated to reveal that the intermolecular CMe - H⋯O(nitro) contacts in (II) are unfeasible for the nitro-nitrito photochemical linkage isomerization process. In (I), there are two independent complexes showing similar conformations, and the central five-membered chelate ring of the tetradentate salen ligand adopts the same absolute configuration. This is the result of pseudo-spontaneous resolution, since the configuration of the five-membered chelate ring may frequently be reversed in solution. In the crystals of (I) and (II), the molecules are linked into three-dimensional networks by C - H⋯O hydrogen bonds.

Original languageEnglish
Pages (from-to)1759-1763
Number of pages5
JournalActa Crystallographica Section E: Crystallographic Communications
Publication statusPublished - 2018


  • crystal structure
  • nitro-nitrito photo-isomerization
  • reaction cavity

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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