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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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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.
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Ionic Crystal Structures

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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.
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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3.0K
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...
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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Conformational Dynamics in an Organic Ionic Plastic Crystal.

Liyu Jin1,2, Kate M Nairn3, Chris D Ling4

  • 1Institute for Frontier Materials, Deakin University , Burwood, VIC 3125, Australia.

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|May 2, 2017
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Summary
This summary is machine-generated.

This study reveals conformational dynamics in solid-state FSI anions within organic ionic plastic crystals, crucial for solid-state electrolyte applications. Cooperative cation-anion motion drives a unique phase transition, advancing electrolyte theory.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Organic ionic plastic crystals are vital for solid-state electrolytes in devices like lithium batteries.
  • Existing theories for molecular plastic crystals don't fully explain dynamics in organic ionic systems due to strong interionic forces.

Purpose of the Study:

  • To investigate the short-range molecular dynamics of organic ionic plastic crystals.
  • To understand the role of interionic interactions in the dynamic behavior of these materials.
  • To explore the potential of [P1222][FSI] as a model system.

Main Methods:

  • Calorimetry
  • Impedance spectroscopy
  • Synchrotron X-ray diffraction
  • Solid-state NMR and Raman spectroscopies

Main Results:

  • Identified conformational dynamics of the bis(fluorosulfonyl)imide (FSI) anion in the solid state for the first time.
  • Linked these dynamics to a novel second-order displacive phase transition in [P1222][FSI].
  • Observed a new disorder mechanism involving cooperative cation-anion motion.

Conclusions:

  • The study provides fundamental insights into the dynamic behavior of organic ionic plastic crystals.
  • Strong interionic interactions lead to cooperative motions and unique phase transitions.
  • Findings advance the understanding of solid-state electrolytes for electrochemical applications.