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Metal-Ligand Bonds02:51

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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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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Complexation Equilibria: The Chelate Effect01:19

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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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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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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Related Experiment Video

Updated: Apr 7, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Tuning Electron Delocalization via Protonation in a Cyanidometal-Bridged Trinuclear Ruthenium Complex.

Hao Wang1, Han Liu1, Xin-Tao Wu1

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter,Chinese Academy of Science, Fuzhou, Fujian 350002, China.

Inorganic Chemistry
|April 6, 2026
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Summary

This study synthesized a ruthenium complex and its oxidized forms, revealing how protonation alters electronic structure and induces charge transfer. The findings offer insights into proton pathways in supramolecular structures.

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Area of Science:

  • Inorganic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Ruthenium complexes with bridging ligands are crucial in catalysis and materials science.
  • Understanding electron transfer and protonation effects is key to designing functional molecular systems.
  • Cyanidometal-bridged complexes offer unique electronic and structural properties.

Purpose of the Study:

  • To synthesize and characterize a novel cyanidometal-bridged trinuclear ruthenium complex.
  • To investigate the effects of oxidation and protonation on the complex's electronic structure.
  • To explore proton-induced intervalence charge transfer mechanisms.

Main Methods:

  • Synthesis of the trinuclear ruthenium complex and its oxidized derivatives.
  • Characterization using single-crystal X-ray diffraction, electrochemistry, and spectroelectrochemistry.
  • Theoretical calculations using (TD)DFT to understand electronic structure changes.

Main Results:

  • Successful synthesis and structural characterization of the complex and its protonated forms.
  • Demonstration of protonation-induced switching from delocalized to localized electronic states.
  • Observation of proton-induced intervalence charge transfer investigated through multiple techniques.

Conclusions:

  • Protonation significantly modulates the electronic properties of the ruthenium complex.
  • The study elucidates a proton pathway in the supramolecular structure.
  • Findings contribute to the understanding of electron-proton coupled phenomena in molecular systems.