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06:44
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Structural and compositional tuning of layered subnitrides; new complex nitride halides
Michael A Brogan1, Robert W Hughes, Ronald I Smith
1School of Chemistry, University of Nottingham, Nottingham, United Kingdom NG7 2RD.
Dalton Transactions (Cambridge, England : 2003)
|June 12, 2010
Summary
Researchers synthesized new nitride halide compounds with tunable structures using calcium, strontium, nitrogen, chlorine, and bromine. These layered materials exhibit unique cation-anion disorder, controlled by dual substitution.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Inorganic Chemistry
Background:
- Layered nitride halides are an emerging class of materials with potential applications.
- Understanding structure-property relationships is crucial for designing new materials.
Purpose of the Study:
- Synthesize novel quaternary and quintinary nitride mixed halides.
- Investigate the structural variations with composition.
- Explore cation-anion disorder in these layered compounds.
Main Methods:
- Synthesis within the Ca-Sr-N-Cl-Br phase system.
- Powder X-ray diffraction for structural analysis.
- Powder neutron diffraction for detailed structural investigation.
Main Results:
- Successful synthesis of new quaternary and quintinary nitride mixed halides.
- All compounds crystallize in the R-3m space group, adopting the anti-alpha-NaFeO(2) structure.
- Observed unprecedented coexistent cation and anion disorder, with nitride uniquely occupying a specific crystallographic site.
- Layered structure consists of alternating [N(Ca,Sr)(2)](+) sheets and halide ions (Cl, Br)(-).
Conclusions:
- Dual cationic-anionic substitution offers precise control over anisotropic structural features.
- Tunable parameters include ionic layer thickness and interlayer spacing.
- These findings open avenues for designing novel layered materials with tailored properties.
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