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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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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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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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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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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.
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,...
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Stereoisomerism02:52

Stereoisomerism

11.1K
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: May 5, 2026

A Salt-Templated Synthesis Method for Porous Platinum-based Macrobeams and Macrotubes
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Pt···Pt vs Pt···S contacts between Pt-containing heterobimetallic lantern complexes.

Frederick G Baddour1, Stephanie R Fiedler, Matthew P Shores

  • 1Department of Chemistry, Boston University , 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States .

Inorganic Chemistry
|November 21, 2013
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel platinum-based heterobimetallic lantern complexes. They found that weaker donors promote metal-metal interactions, while stronger Pt-S interactions lead to no coupling, influenced by pyridine

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Platinum-based heterobimetallic complexes offer unique structural and electronic properties.
  • Lantern complexes provide a versatile scaffold for studying metal-metal interactions.

Purpose of the Study:

  • To synthesize and characterize a new series of platinum-based heterobimetallic lantern complexes.
  • To investigate the influence of different ligands on the structural, magnetic, and electronic properties of these complexes.
  • To categorize the complexes based on metal-metal and metal-sulfur interactions.

Main Methods:

  • Synthesis of novel platinum-heterometal complexes using pyridine, 4-aminopyridine, dimethylsulfoxide, and N,N-dimethylformamide ligands.
  • Structural characterization using X-ray crystallography and spectroscopic techniques (UV-vis-NIR, 1H NMR).
  • Magnetic susceptibility measurements to probe metal-metal coupling.

Main Results:

  • A series of Pt-based heterobimetallic lantern complexes with varying coordination environments were successfully synthesized.
  • Complexes were categorized into three groups based on Pt···Pt and Pt···S distances, revealing distinct interaction patterns.
  • Weaker donors (H2O, pyNO2) promoted metallophilicity and antiferromagnetic coupling, while Pt···S interactions resulted in no observed coupling.
  • The pKa of pyridine ligands correlated with interlantern S···S distances.

Conclusions:

  • Ligand choice significantly impacts the structural and magnetic properties of Pt-based heterobimetallic lantern complexes.
  • Understanding these structure-property relationships is crucial for designing materials with specific magnetic behaviors.
  • The study provides insights into the factors governing metallophilicity and magnetic coupling in these systems.