Optical Isomerism
Optical Isomerism - Related Videos
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...
02:43
Isomerism
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2023
Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
02:01
Isomerism in Alkenes
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2025
Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement. An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...
02:37
Disubstituted Cyclohexanes: cis-trans Isomerism
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2023
Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds. In cyclohexane, the substituents can occupy different positions generating distinct isomers.
08:31
Three-dimensional Optical-resolution Photoacoustic Microscopy
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Cited by 27 •
2011
Optical-resolution photoacoustic microscopy (OR-PAM) is an emerging technology capable of imaging optical absorption contrasts in vivo with cellular resolution and sensitivity. Here, we provide a visualized instruction on the experimental protocols of OR-PAM, including system configuration, system alignment, typical in vivo experimental procedures, and functional imaging schemes.
FAQs
Their three-dimensional shapes may align differently with chiral binding sites on receptors, enzymes, or transport proteins. This altered fit can change how strongly or selectively each enantiomer interacts with the target. Consequently, two mirror-image forms may differ in pharmacological potency or in the biological pathways they influence, even though their molecular connectivity is the same.
Optical isomerism can determine whether a drug fits a particular binding site effectively and whether it favors one target over another. A difference in spatial alignment may strengthen, weaken, or redirect interactions with receptors and enzymes. These changes can influence the amount of drug needed for an effect and the degree to which unintended targets are affected.
Differences may extend beyond the initial target interaction. Enantiomers can show distinct metabolism, distribution, and transport because biological proteins are themselves involved in recognizing molecular shape. Such differences may alter exposure to tissues, duration of action, or adverse effects. Evaluating these properties separately helps clarify whether each form contributes similarly to the overall medicine.
A single enantiomer contains one mirror-image form, whereas a mixture contains both forms. Because the forms may differ in potency, selectivity, metabolism, distribution, or adverse effects, the mixture may not produce the same outcome as either component alone. Comparing these options supports decisions about which composition offers the safest and most effective therapeutic result.
Drug development should examine the relevant enantiomeric forms rather than assuming that both behave identically. Researchers can compare their interactions with receptors, enzymes, and transport proteins, then assess differences in potency, selectivity, metabolism, distribution, and adverse effects. This evidence helps determine whether testing and development should focus on one enantiomer or on a mixture.
Separate study becomes important when molecular handedness could change how a medicine acts or how the body handles it. Pharmacologists may compare the forms to identify differences in target interactions, therapeutic effects, metabolism, distribution, or adverse effects. The resulting comparison provides subject-specific evidence for selecting a drug form and for interpreting the behavior of a mixture.
It gives medicine designers and regulators a framework for asking whether all enantiomeric components are pharmacologically equivalent. Evidence about target binding, potency, selectivity, metabolism, distribution, and adverse effects can reveal whether a single form or mixture is more appropriate. This consideration supports more informed design, testing, and evaluation of therapeutic products.