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Related Concept Videos

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...
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.
Structural Isomerism02:34

Structural Isomerism

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 be...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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...
Stereoisomerism02:52

Stereoisomerism

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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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Time-dependence structures of coordination network wires in solution.

Lorena Welte1, Rodrigo González-Prieto, David Olea

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Summary

Mechanochemistry and sonication were used to isolate ruthenium MMX polymer chains. Atomic force microscopy confirmed uniform subnanometer diameters and long persistence lengths for these isolated polymer structures.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Ruthenium MMX polymers are coordination compounds with potential applications in various fields.
  • Isolating individual polymer chains is crucial for understanding their properties and for developing advanced materials.
  • Current methods for polymer chain isolation can be challenging and may alter chain integrity.

Purpose of the Study:

  • To develop a mechanochemistry-based procedure for isolating individual ruthenium MMX polymer chains.
  • To characterize the structures formed during the isolation process.
  • To investigate the influence of temperature on structure formation.

Main Methods:

  • Mechanochemistry and sonication were employed to break down larger polymer aggregates.
  • Atomic force microscopy (AFM) was used to monitor the formation and architecture of structures over time.
  • The effect of solution temperature on the resulting structures was systematically studied.

Main Results:

  • Individual ruthenium MMX polymer chains with uniform subnanometer diameters and micron-scale lengths were successfully isolated.
  • AFM imaging revealed linear structures with a long persistence length, indicative of well-defined polymer chains.
  • Temperature significantly influenced the formation and morphology of the observed structures.

Conclusions:

  • Mechanochemistry offers a viable route for the controlled isolation of individual MMX polymer chains.
  • The isolated chains possess properties consistent with theoretical predictions for single polymer entities.
  • Temperature control is a critical parameter for optimizing the isolation and structural integrity of MMX polymers.