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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Area of Science:

  • Coordination Chemistry
  • Inorganic Chemistry
  • Electrochemistry

Background:

  • Modulating metal-centered redox chemistry via secondary cations is key.
  • Little is known about the impact of Lewis acidic trivalent cations.

Purpose of the Study:

  • Investigate how secondary cations influence heterobimetallic nickel complexes.
  • Quantify the effects of various cations (La³⁺, Y³⁺, Lu³⁺, Sr²⁺, Ca²⁺, K⁺, Na⁺) on nickel redox behavior.

Main Methods:

  • Synthesis of seven heterobimetallic complexes with a redox-active nickel center.
  • X-ray diffraction for structural analysis.
  • Electrochemical studies and electron paramagnetic resonance (EPR) for redox properties.

Main Results:

  • Secondary cation position correlates with ionic radius.
  • Nickel(II)/Nickel(I) redox is modulated by secondary metals.
  • Trivalent cations diminish heterogeneous electron-transfer rates due to steric hindrance.

Conclusions:

  • Secondary cation identity and placement significantly alter heterobimetallic electrochemical behavior.
  • Topographical free-volume analysis quantifies steric effects on electron transfer.
  • Counteranions also play a role in modulating electrochemical properties.