Metal ion size and coordination mode in complexes of a β-diketiminate ligand with pendant quinoline arms

Elodie E. Marlier, Daniel Sadowsky, Christopher J. Cramer, Kristopher McNeill

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

A suite of late first row transition metal complexes has been synthesized using a monoanionic nitrogen donor β-diketiminate ligand with quinolyl pendant arms, BDIQQH (1). BDIQQNiOTf (2), BDI QQCuCl (4), BDIQQZnCl (5) were prepared from the reaction of 1 with Ni(OTf)2, CuCl2·2H2O and ZnCl2, respectively. BDIQQNiCl (3) was synthesized from an anion exchange of 2 with nBu4NCl. Reaction of 1 and CoI2 afforded the unexpected [(BDIQQ)2Co] +I- (6). Through density functional theory (DFT) calculations, ligand geometries in BDIQQ complexes were investigated and it was found that smaller ionic radius and higher charge destabilize 1:1 metal-ligand complexes relative to alternative 1:2 complexes like 6 owing to significant conformational strain in 1:1 complexes involving metals with small ionic radii. Synthesis and characterization of these complexes, including crystal structures of 4 and 5, are reported, in addition to the results of DFT calculations.

Original languageEnglish (US)
Pages (from-to)173-179
Number of pages7
JournalInorganica Chimica Acta
Volume369
Issue number1
DOIs
StatePublished - Apr 15 2011

Keywords

  • Conformation energy
  • Fluorescence
  • Quinoline
  • β-Diketiminate

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