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  • 标题:Intramolecular Spin State Locking in Iron(II) 2,6-Di(pyrazol-3-yl)pyridine Complexes by Phenyl Groups: An Experimental Study
  • 本地全文:下载
  • 作者:Yulia Nelyubina ; Alexander Polezhaev ; Alexander Pavlov
  • 期刊名称:Maine Policy Review
  • 印刷版ISSN:2312-7481
  • 出版年度:2018
  • 卷号:4
  • 期号:4
  • 页码:46
  • DOI:10.3390/magnetochemistry4040046
  • 语种:English
  • 出版社:The University of Maine
  • 摘要:Here we report a series of 1-phenyl-5-substituted 2,6-di(pyrazol-3-yl)pyridine complexes with iron(II) ion found in a high spin state in solids (according to magnetochemistry) and in solution (according to NMR spectroscopy), providing experimental evidence for it being an intramolecular effect induced by the phenyl groups. According to X-ray diffraction, the high spin locking of the metal ion is a result of its highly distorted coordination environment (with a very low lsquo;twistrsquo; angle atypical of 2,6-di(pyrazol-3-yl)pyridine complexes), which remains this way in complexes with different substituents and counterions, in a diamagnetic zinc(II) analogue and in their solutions. Three possible reasons behind it, including additional coordination with the phenyl group, energy penalty incurred by its rotation or intramolecular stacking interactions, are addressed experimentally.
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