Related Experiment Video
Updated: Jun 22, 2025
06:44
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
69.0K
Formation of extended polyiodides at large cation templates
Alexander J Blake1, Carlo Castellano2, Vito Lippolis3
1School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
Acta Crystallographica. Section C, Structural Chemistry
|June 27, 2024
Summary
This study explores the diverse structures of extended polyiodides, revealing how cation templates influence their formation. Combining X-ray crystallography and FT-Raman spectroscopy enhances the analysis of these complex iodine compounds.
Area of Science:
- Inorganic Chemistry
- Crystallography
- Spectroscopy
Background:
- Extended polyiodides are complex ionic species with diverse structures.
- Characterizing polyiodides beyond the triiodide (I3-) ion is challenging using traditional methods.
- The influence of cation templates on polyiodide formation requires further investigation.
Purpose of the Study:
- To investigate the structural variety of extended polyiodides.
- To understand how cation template properties (shape, charge, dimensions) affect polyiodide structures.
- To evaluate the combined utility of X-ray crystallography and FT-Raman spectroscopy for polyiodide analysis.
Main Methods:
- Synthesis and structural determination of two novel palladium-iodine and cryptand-iodine complexes.
- X-ray crystallography to elucidate the precise atomic arrangement and bonding in polyiodides.
- Fourier Transform (FT)-Raman spectroscopy to identify polyiodide building blocks (I2, I-, I3-) and interactions.
Main Results:
- Confirmed the formation of extended polyiodides with varied structures by modifying cation templates and synthetic conditions.
- Identified discrete polyiodide species as aggregates of I2, I-, and I3- linked by I...I interactions.
- Demonstrated that FT-Raman spectroscopy can identify polyiodide components but lacks topological information.
Conclusions:
- Cation template engineering is crucial for controlling the structural diversity of extended polyiodides.
- FT-Raman spectroscopy complements X-ray crystallography in characterizing complex polyiodide systems.
- A combined analytical approach is essential for comprehensive understanding of extended polyiodide structures and properties.
Keywords:
FT-Raman spectroscopy[2.2.2]cryptandcrystal structurediiodinemixed-donor macrocyclespalladium(II) complexespolyiodidesMore Related Videos
Related Concept Videos
02:42Ionic Crystal Structures
14.3K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.3K
01:17Ion Exchange
574
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
574
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
03:45Formation of Complex Ions
23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
02:48Ionic Bonding and Electron Transfer
41.4K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
41.4K
01:19Complexation Equilibria: The Chelate Effect
498
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
498