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Solubility of Ionic Compounds02:55

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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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. 
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Ionic Crystal Structures02:42

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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Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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Florescence Quenching within Lithium Salt-Added Ionic Liquid.

Anu Kadyan1, Siddharth Pandey1

  • 1Department of Chemistry , Indian Institute of Technology Delhi , Hauz Khas, New Delhi - 110016 , India.

The Journal of Physical Chemistry. B
|April 22, 2018
PubMed
Summary
This summary is machine-generated.

This study explores how adding lithium bis(trifluoromethylsulfonyl)imide (LiTf2N) to ionic liquids affects pyrene-nitromethane quenching. Results show that viscosity and structural changes influence quenching dynamics, with LiTf2N concentration playing a key role.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Ionic liquids are promising electrolytes, offering alternatives to conventional systems.
  • Understanding solute-solvation interactions in ionic liquids is crucial for optimizing their performance.
  • Salt-added ionic liquids introduce complex structural and dynamic changes affecting molecular processes.

Purpose of the Study:

  • To investigate the photophysical behavior of a pyrene-nitromethane fluorophore-quencher pair in salt-added ionic liquid media.
  • To elucidate the influence of lithium bis(trifluoromethylsulfonyl)imide (LiTf2N) concentration and temperature on dynamic quenching processes.
  • To correlate quenching dynamics with the physicochemical properties, such as viscosity and structure, of the ([emim][Tf2N] + LiTf2N) system.

Main Methods:

  • Time-resolved fluorescence spectroscopy was employed to study the excited-state decay of pyrene.
  • The pyrene-nitromethane system was used to probe dynamic quenching in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([emim][Tf2N]) with varying LiTf2N mole fractions (xLiTf) from 0 to 0.40.
  • Measurements were conducted across a temperature range of 298.15 K to 358.15 K.

Main Results:

  • Pyrene excited-state decay followed single-exponential kinetics, indicating dynamic quenching.
  • Dynamic quenching constants (KD) and bimolecular quenching rate constants (kq) initially increased with LiTf2N concentration up to xLiTf ~ 0.10, then decreased monotonically.
  • The decrease in KD and kq was attributed to increased dynamic viscosity, while the initial rise was linked to structural changes and stabilization by anionic clusters.

Conclusions:

  • The pyrene-nitromethane system provides a sensitive probe for dynamic quenching in salt-added ionic liquids.
  • Both viscosity and specific structural arrangements within the ([emim][Tf2N] + LiTf2N) system significantly impact quenching efficiency.
  • The study highlights the complex interplay of factors beyond simple viscosity in determining photophysical processes in functionalized ionic liquid electrolytes.