Coordination Behavior of N,N′-Bis(diisopropylphosphinoacetyl)-o-phenylenediamide with NiII and CuI Ions

Takahiro Ito, Takeshi Matsumoto, Masanori Wakizaka, Ho Chol Chang

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2 Citations (Scopus)


The reaction of N,N′-bis(diisopropylphosphoniumacetyl)-o-phenylenediamide dibromide (H4L·2Br) with NiII[ClO4]·6H2O in the presence of Et3N resulted in the formation of N,N′-bis(diisopropylphosphinoacetyl)-o-phenylenediamidate nickel(II) ([NiII(L)]). The single-crystal X-ray diffraction analysis of [NiII(L)] revealed that each pair of N and P atoms in L2– coordinates in a tetradentate fashion to afford a distorted square-planar NiII amide complex. On the other hand, N,N′-bis(diisopropylphosphinoacetyl)-o-phenylenediamide copper(I) bromide ([CuI(H2L)Br]) was isolated by the reaction of H4L·2Br with [CuI(MeCN)4][PF6] in the presence of Et3N. The structural analysis revealed that the two P atoms in H2L coordinate in a bidentate fashion to afford a trigonal-planar CuI complex, in which the amide moieties remain in free form. Complex [NiII(L)] showed reversible deprotonation processes on the amidate ligand (L2–), whereas the protonated state of the N atoms of the amide ligand (H2L) in [CuI(H2L)Br] was maintained, even in the presence of excess Et3N, suggesting substantial stability for the protonated state.

Original languageEnglish
Pages (from-to)3498-3507
Number of pages10
JournalEuropean Journal of Inorganic Chemistry
Issue number29
Publication statusPublished - 2017 Aug 10
Externally publishedYes


  • Coordination modes
  • Copper
  • Electronic structure
  • N,P ligands
  • Nickel

ASJC Scopus subject areas

  • Inorganic Chemistry


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