Related Experiment Video
Updated: Jun 13, 2025
09:22
Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
Published on: February 7, 2017
7.8K
CO2-actuated spin transition tuning in an interdigitated Hofmann-type coordination polymer
Abhik Paul1, Wataru Kosaka2,3, Bhart Kumar1
1Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research Bhopal Madhya Pradesh India 462066 skonar@iiserb.ac.in.
Chemical Science
|September 12, 2024
Summary
This study demonstrates CO2-responsive magnetic materials. A Hofmann-type coordination polymer exhibits tunable spin-state transitions triggered by carbon dioxide (CO2) physisorption, enabling novel electronic property regulation.
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- Rising anthropogenic carbon dioxide (CO2) emissions necessitate the development of responsive materials.
- Investigating the influence of weak physisorption of gases like CO2 on material electronic properties is crucial.
Purpose of the Study:
- To explore the possibility of regulating electronic properties via CO2 physisorption.
- To demonstrate the first instance of CO2-actuated variable spin-state stabilization in a coordination polymer.
Main Methods:
- Synthesis of an interdigitated Hofmann-type coordination polymer [FeII Pd(CN)4L2] (1).
- Variable temperature magnetic susceptibility measurements under varying CO2 pressures (0-100 kPa).
- Analysis of spin-state transitions and CO2 accommodation effects.
Main Results:
- Compound 1 exhibited a wide shift in spin-transition temperature (Teq) from 178 K (0 kPa CO2) to 229 K (100 kPa CO2).
- Selective low-spin (LS) state stabilization was observed, correlating with the extent of CO2 uptake.
- A cooperative mechanism between CO2 sorption and spin-crossover (SCO) was elucidated.
Conclusions:
- This work presents a novel CO2-responsive magnetic material.
- The findings establish a new pathway for designing materials whose electronic properties can be modulated by CO2.
- The study highlights the potential of coordination polymers in developing advanced CO2-sensing and data-storage applications.
More Related Videos
Related Concept Videos
01:17Spin–Spin Coupling: One-Bond Coupling
950
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
950
01:58Cooperative Allosteric Transitions
7.9K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
7.9K
02:42Valence Bond Theory
8.5K
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...
8.5K
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.0K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.0K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
983
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
983
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