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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Color in Coordination Complexes
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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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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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A Bispidine Iron(IV)-Oxo Complex in the Entatic State.

Peter Comba1, Shunichi Fukuzumi2,3, Carsten Koke4

  • 1Universität Heidelberg, Anorganisch-Chemisches Institut und Interdisziplinäres Zentrum für Wissenschaftliches Rechnen (IWR), INF 270, 69120, Heidelberg, Germany. peter.comba@aci.uni-heidelberg.de.

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|July 29, 2016
PubMed
Summary

Iron(IV)-oxo complexes with bispidine ligands show redox potential and reactivity correlations. Electron transfer and driving force are key factors, influencing alkane hydroxylation and oxidation reactions.

Keywords:
coordination chemistrydensity functional calculationshomogeneous catalysisiron bispidine complexesredox potentials

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Catalysis

Background:

  • Iron(IV)-oxo complexes are crucial intermediates in oxidation catalysis.
  • Bispidine ligands offer tunable steric and electronic properties for metal complexes.
  • Understanding structure-reactivity relationships is vital for catalyst design.

Purpose of the Study:

  • To correlate redox potentials with catalytic reactivity for Fe(IV)=O complexes.
  • To investigate the mechanisms of alkane hydroxylation (HAT), alkene epoxidation, and oxidation (OAT).
  • To elucidate the impact of ligand structure on complex stability and reactivity.

Main Methods:

  • Synthesis and characterization of Fe(IV)=O complexes with tetra- and pentadentate bispidine ligands.
  • Electrochemical studies to determine redox potentials.
  • Kinetic studies of various oxidation reactions (HAT, OAT, epoxidation).
  • Density Functional Theory (DFT) calculations.

Main Results:

  • Redox potentials varied by ~350 mV, correlating with reaction rates spanning 8 orders of magnitude.
  • Electron transfer and reaction driving force were identified as major factors.
  • DFT analysis supported the experimental findings.
  • Isomeric pentadentate bispidine ligands exhibited different reactivities due to destabilization of the S=1 ferryl ground state.

Conclusions:

  • Redox properties significantly influence the catalytic activity of Fe(IV)=O complexes.
  • Ligand design, including isomerism, critically affects complex stability and reactivity.
  • Electron transfer dynamics are paramount in these oxidation catalytic systems.