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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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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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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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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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Ladder Diagrams: Complexation Equilibria01:07

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Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of 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 General Pathway to Heterobimetallic Triple-Decker Complexes.

Martin Piesch1, Fabian Dielmann2, Stephan Reichl1

  • 1Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 21, 2019
PubMed
Summary

This study explores the reactivity of triple-decker cobalt complexes with phosphorus ligands, synthesizing novel heterobimetallic compounds. These complexes display fluxional behavior, which can be controlled by tungsten coordination, leading to unique structures.

Keywords:
cobaltcyclo-Pn ligandsironnickeltriple-decker complexes

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Triple-decker complexes are intriguing supramolecular structures with diverse electronic and steric properties.
  • Phosphorus-rich ligands offer unique coordination modes and reactivity in organometallic chemistry.
  • Understanding the reactivity and dynamic behavior of these complexes is crucial for designing new materials and catalysts.

Purpose of the Study:

  • To investigate the reactivity of a specific triple-decker cobalt complex with various phosphorus ring ligands (cyclo-P3, cyclo-P4, cyclo-P5).
  • To synthesize and characterize novel heterobimetallic triple-decker sandwich complexes.
  • To explore the fluxional behavior of these complexes and methods to control it.

Main Methods:

  • Synthesis of heterobimetallic triple-decker sandwich complexes using mild reaction conditions.
  • Characterization techniques including single-crystal X-ray structure analysis, NMR spectroscopy (variable temperature), mass spectrometry, and elemental analysis.
  • Investigation of dynamic processes through variable temperature NMR spectroscopy and coordination studies with tungsten fragments.

Main Results:

  • Successful synthesis and full characterization of heterobimetallic triple-decker complexes [(Cp*Fe)(Cp'''Co)(μ,η5:η4-P5)] (1) and [(Cp'''Co)(Cp'''Ni)(μ,η3:η3-P3)] (3).
  • Observation and investigation of unique fluxional behavior in solution for synthesized complexes using variable temperature NMR.
  • Demonstration that coordination to {W(CO)5} fragments can block dynamic processes, yielding new complexes (2a, 2b, 4).
  • Thermolysis of complex 3 leads to the formation of a tetrahedrane complex [(Cp'''Ni)2(μ,η2:η2-P2)] (5).

Conclusions:

  • The study successfully demonstrates the controlled synthesis and characterization of novel triple-decker sandwich complexes involving phosphorus ligands.
  • The fluxional behavior of these complexes can be modulated through coordination, offering pathways to stabilize specific structural motifs.
  • The findings contribute to the understanding of reactivity and structural diversity in organometallic phosphorus chemistry.