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Supramolecular Solid Complexes between Bis-pyridinium-4-oxime and Distinctive Cyanoiron Platforms
Igor Picek1, Dubravka Matković-Čalogović2, Goran Dražić3
1Department of Chemistry and Biochemistry, School of Medicine, University of Zagreb, Šalata 3, HR-10000 Zagreb, Croatia.
Molecules (Basel, Switzerland)
|April 27, 2024
Summary
New supramolecular cyanoiron salts incorporating Toxogonin® (TOXO) were synthesized and characterized. These materials exhibit interesting structural, optical, and hydrochromic properties, showcasing TOXO
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Coordination Chemistry
Background:
- Supramolecular chemistry focuses on the study of complex chemical systems held together by non-covalent interactions.
- Cyanoiron complexes are versatile building blocks in materials science due to their tunable electronic and magnetic properties.
- Toxogonin® (TOXO), an electron acceptor, has potential applications in functional materials.
Purpose of the Study:
- To synthesize and characterize novel supramolecular cyanoiron salts using Toxogonin® (TOXO) as an electron acceptor.
- To investigate the structural, optical, and hydrochromic properties of these new materials.
- To explore the role of TOXO in supramolecular assembly and its binding capabilities.
Main Methods:
- Synthesis of cyanoiron salts with hexacyanoferrate(II) and nitroprusside platforms.
- Single-crystal X-ray diffraction for structural determination.
- Spectroscopic analyses (UV-vis-NIR, IR, NMR, Mössbauer).
- Thermal analysis (TGA/DSC).
- Powder X-ray diffraction (PXRD).
- Microscopy (SEM, TEM).
Main Results:
- Two water-insoluble phases based on hexacyanoferrate(II): (TOXO)2[Fe(CN)6]·8H2O (1a) and (TOXO)2[Fe(CN)6]·3.5H2O (1cr).
- Phase 1a exhibits hydrochromism, reversibly transforming to an anhydrous phase (1b) upon stimulation and back to 1a upon water uptake.
- A water-insoluble salt with nitroprusside, TOXO[Fe(CN)5(NO)]·2H2O (2), was also synthesized and characterized.
- Structural and spectroscopic data revealed insights into supramolecular binding, electron acceptance, and hydrogen bonding of TOXO.
Conclusions:
- Novel supramolecular cyanoiron materials incorporating TOXO have been successfully synthesized.
- The materials display distinct structural, optical, and hydrochromic properties.
- TOXO acts as an effective electron acceptor and plays a crucial role in the self-assembly and hydrogen bonding within these functional materials.
![Solid-phase Synthesis of [4.4] Spirocyclic Oximes](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F58508.jpg&w=3840&q=50)
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