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Related Concept Videos

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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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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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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Valence Bond Theory02:42

Valence Bond Theory

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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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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

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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.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Toward Understanding Ligand-Directed Excited-State Electron Flow in Bridged Ruthenium(II) Complexes.

Hailey M Bierling1, Andrea R Dorsa2, John LaCoursiere3

  • 1Department of Chemistry, Villanova University, 800 E Lancaster Ave, Villanova, Pennsylvania 19085, United States.

Inorganic Chemistry
|December 2, 2025
PubMed
Summary
This summary is machine-generated.

Researchers designed ruthenium complexes to control light-driven chemical reactions. Electron-donating substituents promote charge transfer, while electron-withdrawing ones localize the excited state, offering molecular-level control in catalysis.

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Area of Science:

  • Photochemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Efficient light capture and directed energy transfer are crucial for driving chemical reactions in molecular systems.
  • Bridged bimetallic complexes offer tunable platforms for controlling photophysical processes.

Purpose of the Study:

  • To synthesize and investigate tetrapyrido[3,2-a:2',3'-c:3'',2''-h:2''',3'''-j]phenazine (tpphz)-bridged bimetallic ruthenium complexes.
  • To explore the influence of electron-withdrawing (EW) and electron-donating (ED) substituents on distal ligands on electron flow and excited-state dynamics.
  • To elucidate the excited-state mechanism in these complexes for controlled light-driven reactions.

Main Methods:

  • Synthesis of tpphz-bridged bimetallic Ru complexes with varied EW/ED substituted polypyridyl ligands.
  • Density functional theory (DFT) and time-dependent DFT (TD-DFT) for electronic transition analysis.
  • Cyclic voltammetry and transient absorption spectroscopy for electrochemical and photophysical characterization.

Main Results:

  • Excited state localization on EW-substituted distal ligands; charge transfer to tpphz bridge promoted by ED substituents.
  • Two-electron oxidation of Ru centers correlated with substituent nature (EW/ED).
  • Excited-state lifetimes varied based on distal ligand substituents; electron transfer to tpphz bridge observed in most complexes.

Conclusions:

  • Molecular-level understanding of excited-state electron transfer control in bridged transition metal complexes.
  • Demonstrated tunability of photophysical properties through strategic selection of distal ligands.
  • Provides a foundation for designing efficient light-driven molecular systems and catalysts.