Related Experiment Video
Updated: Jul 2, 2026
09:34
Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
Published on: February 6, 2020
Supramolecule-to-supramolecule transformations of coordination-driven self-assembled polygons
Liang Zhao1, Brian H Northrop, Peter J Stang
1Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake City, Utah 84112, USA. liangz@chem.utah.edu
Journal of the American Chemical Society
|August 16, 2008
Summary
Researchers achieved new supramolecular transformations, converting self-assembled platinum polygons into different structures. This metal-organic polygon conversion offers a novel method for creating and modifying complex molecular architectures.
Area of Science:
- Supramolecular Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Self-assembled metal-organic polygons are intricate structures with potential applications.
- Controlling supramolecular transformations is crucial for designing advanced molecular materials.
Purpose of the Study:
- To demonstrate controllable supramolecular transformations of platinum(II)-pyridyl metal-organic polygons.
- To explore the conversion of one polygon architecture into another using specific chemical reactions.
Main Methods:
- Reaction of a pre-formed [6+6] hexagon or a triangle-square mixture of Pt(II)-pyridyl polygons with cobalt carbonyl.
- Utilizing the acetylene moiety of a dipyridyl donor ligand for transformation.
- Characterization using proton and phosphorus-31 nuclear magnetic resonance (1H and 31P NMR) spectroscopy.
- Identification of transformed species via electrospray ionization (ESI) mass spectrometry.
Main Results:
- A [6 + 6] hexagon was successfully transformed into two [3 + 3] hexagons.
- A mixture of triangle and square polygons was converted into [2 + 2] rhomboids.
- NMR spectroscopy confirmed the transformation process and quantified yields.
- ESI mass spectrometry verified the structures of the newly formed polygons.
Conclusions:
- Achieved novel supramolecule-to-supramolecule transformations for Pt(II)-pyridyl polygons.
- Demonstrated the ability to controllably convert one self-assembled polygon structure into alternative architectures.
- Established a viable pathway for both the construction and subsequent transformation of complex self-assembled polygons.
Related Concept Videos
02:34Structural 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...
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...
![[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2Ffiles%2Fmedia%2Fscience-education%2Fscience-education-thumbs%2F12422.jpg&w=3840&q=75)
01:21[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
02:54Coordination 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...
02:57Coordination 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.
02:52Stereoisomerism
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...
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...
01:03Step-Growth Polymerization: Overview
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...