Isomers
Isomers - Related Videos
02:18
Constitutional Isomers of Alkanes
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2023
Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as constitutional isomerism. Alkanes with four or more carbons showing multiple structures with the same molecular formula thereby exhibit constitutional isomerism. The linear isomer of an alkane is prefixed by the term “n”; hence a linear isomer of pentane is known as n-pentane. Based on the type of branching, some of the branched isomers are given...
11:44
Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities
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Cited by 8 •
2018
Cysteine-rich peptides fold into distinct three-dimensional structures depending on their disulfide connectivity. Targeted synthesis of individual disulfide isomers is required when buffer oxidation does not lead to the desired disulfide connectivity. The protocol deals with the selective synthesis of 3-disulfide-bonded peptides and their structural analysis using NMR and MS/MS studies.
02:52
Stereoisomerism
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2020
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...
02:34
Structural Isomerism
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2020
Isomerism in Complexes Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers. Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
11:10
Application of Group Theory to IR Spectroscopy
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2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University Metal carbonyl complexes are used as metal precursors for the synthesis of organometallic complexes as well as catalysts. Infrared (IR) spectroscopy is one of the most utilized and informative characterization methods of CO containing compounds. Group theory, or the use of mathematics to describe the symmetry of a molecule, provides a method to predict the number of IR active C-O vibrational modes within a molecule.
FAQs
Structural isomers can differ in atom-to-atom connectivity, while stereoisomers preserve connectivity but change the three-dimensional arrangement. These differences alter chemical properties, so compounds with the same molecular formula may participate differently in biological processes. This distinction helps explain variation in metabolism, signaling, and therapeutic behavior without requiring a different elemental composition.
Enantiomers are nonsuperimposable mirror images, and their spatial arrangements can affect how they fit with chiral enzymes and receptors. As a result, one mirror-image form may interact more effectively or differently than the other. This molecular selectivity provides a structural explanation for differences in biological activity even when the compounds share the same connectivity.
The comparison between glucose and fructose shows that molecular formula alone does not determine biological behavior. Their differing molecular arrangements are associated with distinct chemical properties, which helps explain why they behave differently in biological systems. Isomerism therefore provides a framework for connecting molecular structure with the way sugars participate in metabolism.
Cis and trans fatty acids illustrate how differences in spatial arrangement can influence biological effects. Although the comparison concerns the same broad molecular context, the distinct configurations are associated with different effects in biology. Examining these forms helps researchers relate three-dimensional molecular structure to the consequences of fatty acids in biological systems.
Different drug isomers can show unequal biological activity because their structures interact differently with enzymes or receptors. One enantiomer may be more active, whereas another may be safer, making the specific isomer clinically relevant to therapeutic design. Studying these differences helps connect molecular arrangement with both desired drug effects and potential safety considerations.
A useful analysis compares an isomer’s connectivity or three-dimensional arrangement with its chemical and biological behavior. Researchers can then relate structural differences to metabolism, signaling, or therapeutic activity, depending on the system being studied. This approach makes isomerism a bridge between molecular structure and observable biological outcomes rather than treating formula alone as sufficient information.