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Materials, Chemistry, and Synthesis of Covalent Organic Frameworks
Published in Tuan Anh Nguyen, Ram K. Gupta, Covalent Organic Frameworks, 2023
Mohaddeseh Afshari, Mohammad Dinari
In the chemistry of small organic molecules, compounds with different chemical structures but the same molecular formula are so-called structural isomers. The “framework isomerism” phrase was first defined for MOFs by Zhou et al. [32]. According to this definition, MOFs with different lattice structures composed of identical ligands and central metal nuclei are structural isomers relative to each other. Similarly, COF isomers are COFs with varying lattice structures constructed from the same linkers and knots. Unfortunately, there are limited examples in this area, so this issue has not been studied comprehensively. Recently, due to the need for broad structural diversity, this strategy has received more attention.
Organic Chemistry Nomenclature
Published in Arthur W. Hounslow, Water Quality Data, 2018
Structural isomers are compounds with the same molecular formula, but with a different carbon skeleton, that is, amount of branching. They contain four or more carbons. For example, butane may consist of a normal (η-butane) straight chain or a branched (iso-butane) isomer. Another type of branching is designated neo. The numbers of possible isomers for a variety of carbon atoms is shown in Table 7.3. The compounds described above are straight- or branched-chain compounds called aliphatic compounds. These alkanes are commonly called paraffins.
Glossary of scientific and technical terms in bioengineering and biological engineering
Published in Megh R. Goyal, Scientific and Technical Terms in Bioengineering and Biological Engineering, 2018
Isomer refers to: (1) Structural isomers have the same chemical formula but different structures; e.g., leucine and isoleucine; (2) Stereoisomers are different topological forms of an otherwise single chemical structure, due to changes in bond configurations about some axis or plane of symmetry; eg, Dand L-glucose or cisand trans-cinnamic acid.
Thermodynamic and separation properties of 4-(octyloxy) benzoic acid liquid crystals by inverse gas chromatography (IGC)
Published in Instrumentation Science & Technology, 2021
Birol Isik, Fatih Cakar, Husnu Cankurtaran, Ozlem Cankurtaran
IGC is widely used to separate isomers with lower cost and better accuracy than conventional separation methods. Since structural isomers have different molecular arrangements and toxicities, their use in industry may also be different. Therefore, it is important to separate isomers for their industrial applications. Unlike conventional stationary phases used in GC, the use of LCs as stationary phase is more effective for isomer separation.[18,19]