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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

Electrophilic Addition to Alkynes: Halogenation

Electrophilic Addition to Alkynes: Halogenation

Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.

Cycloalkanes

Cycloalkanes

Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
The IUPAC nomenclature of cycloalkanes follows similar rules that apply to...

Aromatic Hydrocarbon Cations: Structural Overview

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...

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Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods

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Aluminium cyclo-hexa-phosphate.

Abdelghani Oudahmane, Aïcha Mbarek, Malika El-Ghozzi

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This summary is machine-generated.

Researchers synthesized single crystals of aluminum phosphate, Al(2)P(6)O(18), revealing a monoclinic structure. This structure features isolated six-membered phosphate rings linked by aluminum oxide octahedra.

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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Published on: November 22, 2016

Area of Science:

Solid-state chemistry
Inorganic chemistry
Crystallography

Background:

Aluminum phosphates are a class of inorganic compounds with diverse structural motifs.
Understanding the crystal structure of novel aluminum phosphates is crucial for materials science applications.

Purpose of the Study:

To synthesize single crystals of aluminum phosphate, Al(2)P(6)O(18).
To elucidate the crystal structure and bonding characteristics of Al(2)P(6)O(18).

Main Methods:

Solid-state reaction for crystal synthesis.
X-ray crystallography for structure determination.

Main Results:

Single crystals of Al(2)P(6)O(18) were successfully obtained.
The monoclinic structure is isotypic with Cr(III), Ga(III), and Ru(III) analogues.
The structure consists of isolated P(6)O(18) (6-) phosphate rings linked by AlO(6) octahedra.

Conclusions:

The crystal structure of Al(2)P(6)O(18) features a unique arrangement of phosphate rings and aluminum octahedra.
The linkage involves cis-positioned bidentate diphosphate groups connecting the rings to the aluminum centers.