Preparation and structure elucidation of novel organoruthenium amidinates bearing η4-diene ligands

Taizo Hayashida, Kazuma Miyazaki, Yoshitaka Yamaguchi, Hideo Nagashima

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11 Citations (Scopus)


A series of novel ruthenium amidinate complexes bearing η4-cyclooctadiene (COD) or η4-norbornadiene (NBD) ligand was prepared, and their structures were elucidated by spectroscopy and crystallography. A disilver amidinate, Ag22,η-PhNC(H)=NPh}2, was treated with either (η4-COD)Ru(MeCN)2Cl2 or (η4-NBD)Ru(pyridine)2Cl2 to form the corresponding bisamidinate complex, (η4-COD)Ru{η2-PhNC(H)=NPh}2 (5a) or (η4-NBD)Ru{η2-PhNC(H)=NPh}2 (5a′), respectively, in moderate to good yield. Alternatively, (η4-COD)Ru{η2-iPrNC(Me)=N iPr}2 (5b) or (η4-NBD)Ru{η2-iPrNC(Me)=N iPr}2 (5b′) was synthesized by reaction of [(η4-COD)RuCl2]n or (η4-NBD)Ru(pyridine)2Cl2 with Li{iPrNC(Me)=NiPr}. Careful treatment of (η4-NBD)Ru(pyridine)2Cl2 with one equivalent of Li{iPrNC(Me)=NiPr} resulted in the formation of a monoamidinate complex, (η4-NBD)Ru{η2-iPrNC(Me)=N iPr}(pyridine)Br (6) as a good precursor for a mixed amidinate complex, (η4-NBD)Ru{η2-iPrNC(Me)=N iPr}{η2-PhNC(H)=NPh} (5c′), which was obtained by the reaction of 6 with Ag22,η-PhNC(H)=NPh}2. Crystal structures of these complexes revealed the octahedral arrangement of the ligands.

Original languageEnglish
Pages (from-to)167-176
Number of pages10
JournalJournal of Organometallic Chemistry
Issue number2
Publication statusPublished - Sept 21 2001

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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