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Characteristics and Nomenclature of Copolymers

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

Stereoisomerism

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

Prochirality

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

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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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Topology, chirality and interpenetration in coordination polymers.

Shi-Yuan Zhang¹, Zhenjie Zhang, Michael J Zaworotko

¹Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, CHE205, Tampa, Florida 33620, USA. xtal@usf.edu.

Chemical Communications (Cambridge, England)

|September 14, 2013

Summary

A 1998 study highlighted multiple properties and topological classification in coordination polymer networks. This foundational work presaged the field's significant growth, impacting materials science and chemistry.

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Area of Science:

Materials Science
Chemistry
Crystallography

Background:

Coordination polymer networks exhibit diverse properties.
Network connectivity can be classified using topology.
Early work in 1998 foreshadowed the field's expansion.

Purpose of the Study:

To revisit a seminal 1998 contribution on coordination polymers.
To emphasize the role of topology in understanding network structures.
To highlight the prescient nature of early research in this area.

Main Methods:

Review of historical scientific literature.
Analysis of topological concepts in network classification.
Discussion of early findings on coordination polymer properties.

Main Results:

The 1998 work identified multiple properties within coordination polymer networks.
It established topology as a key tool for classifying network connectivity.
This research anticipated the exponential growth of the field.

Conclusions:

The 1998 contribution was foundational for modern coordination polymer science.
Topological approaches remain crucial for characterizing complex networks.
Understanding early work provides context for current advancements.