Problem 8 What are borides and carboranes?... [FREE SOLUTION]

Chapter 12: Problem 8

What are borides and carboranes? Discuss their structure.

Short Answer

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Borides are compounds of boron with less electronegative elements with complex structures depending on the ratio of boron to the other element. Carboranes are boron-cluster compounds with carbon replacing one or two boron atoms. They have a cluster structure with vertices occupied by boron and carbon atoms.

Step by step solution

Define Borides

Borides are binary compounds of boron with less electronegative elements. They are generally hard, high melting point materials with metallic conductivity.

Describe the Structure of Borides

The structure of borides can be quite complex. It depends on the ratio of boron to the other element in the compound. For example, some borides are covalently bonded networks, while others are metallic with the boron atoms occupying specific sites in a metallic lattice.

Define Carboranes

Carboranes are a class of boron-cluster compounds with carbon atoms. They are part of the larger family of cluster compounds or boron hydrides known as boranes. However, carboranes have one or two carbon atoms replacing boron atoms in the cluster.

Describe the Structure of Carboranes

The structure of carboranes is similar to that of boranes, except for the replacement of boron by carbon atoms. They have a cluster structure which means they have polyhedral structures where the vertices are occupied by boron and carbon atoms.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Binary Compounds of Boron

Binary compounds of boron, often referred to as borides, are made up of boron and one other less electronegative element. These compounds exhibit a range of physical properties, typically characterized by their hardness and high melting points, akin to those of other boron compounds like boron carbide. Borides are also known for having metallic conductivity, which makes them useful in a variety of industrial applications, such as wear-resistant coatings and high-temperature materials.

Diving into the Structure of Borides

The structure of borides is fascinatingly diverse and can range from simple to remarkably complex. This variety is largely determined by the ratio of boron to the other element in the compound. For instance, in some borides, the atoms are linked together in covalent networks which contribute to their impressive hardness. In contrast, other types of borides exhibit a metallic character where boron atoms are interspersed within a metallic lattice. This unique placement allows them to maintain metallic properties while also exhibiting the characteristic durability of boron compounds.

Exploring Boron-Cluster Compounds

Boron-cluster compounds, such as carboranes, represent an interesting subset of chemical compounds where boron atoms form a cluster, sometimes alongside other elements like carbon. Carboranes are notably distinct from boranes, another boron cluster family, due to the inclusion of carbon atoms within the cluster. This incorporation presents a hybrid structure that imparts distinctive chemical properties. Boron-cluster compounds are regarded for their stability and are of interest in fields ranging from medicine to materials science.

Getting Acquainted with the Structure of Carboranes

Carboranes are intriguing for their polyhedral cluster structures, which resemble a geometrical shape with vertices. These vertices are not exclusively occupied by boron atoms鈥攁s is the case in boranes鈥攂ut also include carbon atoms. The substitution of carbon into the boron framework leads to a modified set of properties. For instance, carboranes are known to be remarkably heat resistant and have chemical inertness, which paves the way for their use in high-temperature engineering applications, and potentially in pharmaceutical chemistry, due to their biological compatibility.

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91影视

What are borides and carboranes? Discuss their structure.

Short Answer

Step by step solution

Define Borides

Describe the Structure of Borides

Define Carboranes

Describe the Structure of Carboranes

Key Concepts

Understanding Binary Compounds of Boron

Diving into the Structure of Borides

Exploring Boron-Cluster Compounds

Getting Acquainted with the Structure of Carboranes

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