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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

21.4K
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.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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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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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.6K
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.
Removing one hydrogen from the intervening CH2 group...
3.6K
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

764
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...
764
Stereoisomerism02:52

Stereoisomerism

13.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Updated: Jan 7, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Cationic and Neutral Heterometallic Ir-Group 12 Element Polyhydride Compounds: Synthesis, Structure and Reactivity.

Amber M Walsh1, Carlos Martín-Fernández2, John P Lowe1

  • 1Department of Chemistry, University of Bath, Bath BA2 7AY, U.K.

Inorganic Chemistry
|January 1, 2026
PubMed
Summary
This summary is machine-generated.

This study details the synthesis and reactivity of novel iridium-zinc and iridium-cadmium heterometallic hydride complexes. These complexes, featuring N-heterocyclic carbene ligands, expand the known family of polyhydride compounds.

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A Protocol for Safe Lithiation Reactions Using Organolithium Reagents
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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Catalysis Research

Background:

  • N-heterocyclic carbenes (NHCs) are versatile ligands in organometallic chemistry.
  • Polyhydride complexes are important in catalysis and fundamental studies.
  • Heterometallic complexes offer unique reactivity and structural diversity.

Purpose of the Study:

  • To synthesize and characterize novel iridium-zinc and iridium-cadmium heterometallic hydride complexes.
  • To investigate the reactivity of these complexes, including dehydrogenation and hydride elimination pathways.
  • To explore the structural and electronic properties of these new polyhydride species.

Main Methods:

  • Synthesis of iridium complexes using [Ir(IPr)2H2][BArF4] as a precursor.
  • Reactions with organometallic reagents (M'R2) and unsaturated substrates.
  • Characterization using X-ray crystallography, NMR spectroscopy, and computational analysis.

Main Results:

  • Formation of square-pyramidal [Ir(IPr)(IPr″)(M'R)H][BArF4] complexes via NHC dehydrogenation and R-H elimination.
  • Synthesis of polyhydride intermediates and highly fluxional species under H2 atmosphere.
  • Characterization of pentahydride Ir(IPr)2H5 and related complexes through reactions with Lewis bases and organometallic reagents.

Conclusions:

  • The study successfully prepared and characterized a range of new Ir-Zn and Ir-Cd heterometallic hydride complexes.
  • The reactivity highlights the influence of NHC ligands and metal centers on hydride dynamics.
  • These findings contribute to the limited but growing field of polyhydride complexes with NHC ligands.