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¹H NMR: Pople Notation

¹H NMR: Pople Notation

The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...

Characteristics and Nomenclature of Homopolymers

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.

Ionic Compounds: Formulas and Nomenclature

Ionic Compounds: Formulas and Nomenclature

An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

Phosphate Buffer

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Overview

Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...

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Pressure-stabilized sodium polyhydrides: NaH(n) (n>1).

Pio Baettig¹, Eva Zurek

¹Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA.

Physical Review Letters

|July 21, 2011

Summary

Computational studies reveal that sodium hydride NaH(9) is stable at 25 GPa. Metallic properties emerge in NaH(9) and other sodium hydride phases under high pressure due to electron band filling and core overlap effects.

Area of Science:

Computational Materials Science
Solid-State Chemistry
High-Pressure Physics

Background:

Understanding the behavior of metal hydrides under extreme conditions is crucial for discovering new materials.
Sodium hydrides (NaH(n)) are of interest due to their potential for unique electronic properties.

Purpose of the Study:

To computationally investigate the structural stability and metallization of sodium hydrides (NaH(n)) for n=6-12.
To determine the pressure-induced phase transitions and electronic properties of these compounds.

Main Methods:

Density Functional Theory (DFT) calculations were employed to simulate NaH(n) compounds.
Structural stability and electronic band structures were analyzed as a function of applied pressure.

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Main Results:

NaH(9) was found to be stable at pressures above 25 GPa.
The Cmc2(1)-NaH(9) phase, containing both H(2) and H(-) units, becomes metallic at pressures exceeding 250 GPa.
Phases with only H(2) units metallize at lower pressures due to Na 3s electron filling of H(2) σ(u)* bands.
Odd-numbered phases with H(-) exhibit band gap closure influenced by Na 2p core overlap, while even-numbered phases remain metallic up to 300 GPa.

Conclusions:

The stability and metallization pressure of metal hydrides (MH(n), n>1) correlate inversely with the metal's ionization potential (IP).
The optimal stoichiometry (n) for MH(n) stability increases with the metallic radius of M.
High pressure can induce metallicity in sodium hydrides through distinct mechanisms depending on their structural and electronic composition.