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Related Concept Videos

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Valence Bond Theory02:42

Valence Bond Theory

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...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

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Related Experiment Video

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Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Bifunctional ligand approach for constructing 3d-4f heterometallic clusters.

Gang Wu1, Ian J Hewitt, Samir Mameri

  • 1Institut für Anorganische Chemie der Universität Karlsruhe, Engesserstrasse Geb. 30.45, D-76128 Karlsruhe, Germany.

Inorganic Chemistry
|August 7, 2007
PubMed
Summary

A novel heptanuclear copper-gadolinium (CuII-GdIII) cluster was synthesized using a Schiff-base tripodal ligand. This new molecule exhibits a high spin ground state of S=17/2, important for magnetic applications.

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Published on: March 20, 2017

Area of Science:

  • Coordination Chemistry
  • Inorganic Chemistry
  • Magnetochemistry

Background:

  • Schiff-base ligands are versatile building blocks in coordination chemistry.
  • Polynuclear metal clusters offer tunable magnetic properties.

Purpose of the Study:

  • To synthesize a novel heptanuclear CuII-GdIII cluster.
  • To characterize the magnetic properties of the synthesized cluster.

Main Methods:

  • Synthesis of a metal cluster using a predesigned Schiff-base tripodal ligand.
  • Characterization of the cluster's spin ground state.

Main Results:

  • Successful synthesis of a heptanuclear CuII-GdIII cluster.
  • Determination of a spin ground state of S=17/2.

Conclusions:

  • The Schiff-base tripodal ligand facilitates the formation of high-spin polynuclear complexes.
  • The synthesized CuII-GdIII cluster is a promising candidate for molecular magnetism research.