Related Experiment Video
Updated: Jul 4, 2025
06:16
Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
Published on: December 21, 2017
5.7K
Solvent-induced structural transformation in a one-dimensional coordination polymer.
Kangwoo Jin1, Nohyoon Park1, Yongdeok Ahn1
1Department of Physics and Chemistry, Daegu-Gyeongbuk Institute of Science and Technology, Daegu 42988, the Republic of Korea. jooyoung@dgist.ac.kr.
Nanoscale
|February 9, 2024
Summary
Researchers developed a flexible one-dimensional coordination polymer (1D CP) that transforms into a 3D network. This structural flexibility leads to hierarchical porosity and
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Crystallography
Background:
- Designing materials with dynamic structures is crucial for advanced applications.
- Coordination polymers (CPs) offer tunable properties through controlled assembly.
- Structural flexibility in CPs can lead to emergent functionalities.
Purpose of the Study:
- To rationally design a structurally flexible one-dimensional coordination polymer (1D CP).
- To investigate the transformation of the 1D CP into a three-dimensional (3D) network.
- To explore the relationship between structural dynamics, porosity, and fluorescence properties.
Main Methods:
- Rational design and synthesis of a 1D CP (1D-DGIST-18).
- Solvent exchange and drying to induce structural transitions.
- Single-crystal X-ray diffractometry to elucidate structural changes.
- Fluorescence spectroscopy to study optical properties.
Main Results:
- A flexible 1D CP, 1D-DGIST-18, was successfully synthesized.
- Structural transformation into a 3D network was achieved via solvent interactions.
- Hierarchical porosity (micro-, meso-, macroporous) was generated due to structural dynamics.
- Acetone immersion induced 'turn-on' fluorescence via excimer formation.
Conclusions:
- The study demonstrates a strategy for designing flexible CPs with tunable porosity.
- Structural dynamics are key to achieving hierarchical porosity and responsive fluorescence.
- 1D-DGIST-18 serves as a model for developing advanced functional materials.
Related Concept Videos
02:34Structural Isomerism
19.2K
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...
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...
19.2K
01:21Polymer Classification: Crystallinity
2.9K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.9K
00:57Cationic Chain-Growth Polymerization: Mechanism
2.3K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.3K
02:37Metallic Solids
18.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.4K
02:42Valence Bond Theory
8.6K
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...
8.6K
02:11Conformations of Cyclohexane
12.5K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
12.5K