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Structural Isomerism02:34

Structural Isomerism

21.5K
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...
21.5K
Isomerism02:43

Isomerism

23.0K
Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
23.0K
Isomerism in Alkenes02:01

Isomerism in Alkenes

14.7K
Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement.
An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...
14.7K
Coordination Number and Geometry02:57

Coordination Number and Geometry

18.9K
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.
18.9K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

26.4K
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...
26.4K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

11.4K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
11.4K

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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

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Exploiting Coordination Isomerism for Controlled Self-Assembly.

Nils Bäumer1, Kalathil K Kartha1, Naveen Kumar Allampally2

  • 1Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149, Münster, Germany.

Angewandte Chemie (International Ed. in English)
|July 28, 2019
PubMed
Summary
This summary is machine-generated.

Researchers used platinum(II) complex isomerism to control nanomaterial assembly. This allows reversible switching between 1D fibers and 2D lamellae using light, creating new stimuli-responsive materials.

Keywords:
coordination isomerismphotoresponsive behaviorself-assemblysupramolecular polymersπ-conjugated systems

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Geometrical isomerism in metal complexes is a known phenomenon.
  • Controlling supramolecular assembly is crucial for developing advanced materials.

Purpose of the Study:

  • To utilize the geometrical isomerism of a platinum(II) complex for controlling supramolecular assembly.
  • To investigate the reversible switching between different aggregate species using external stimuli.

Main Methods:

  • Exploiting inherent geometrical isomerism of a platinum(II) complex.
  • Utilizing UV irradiation, solvent, temperature, and concentration for tunable coordination isomerism.
  • Characterizing the switching between 1D fibers and 2D lamellae.

Main Results:

  • Demonstrated tunable coordination isomerism in a Pt(II) complex.
  • Achieved fully reversible switching between 1D fibers and 2D lamellae.
  • Observed different photoresponsive behaviors for the two aggregate species.

Conclusions:

  • Coordination isomerism can be effectively used to control supramolecular assembly.
  • Novel stimuli-responsive nanomaterials can be developed based on this approach.
  • The findings expand the understanding and application of coordination isomerism.