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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

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.
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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...
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A structure is defined as a system of interconnected members designed to support or transfer forces and successfully withstand the loads acting on them. The internal forces of a structure can be determined by decomposing the structure and analyzing the free-body diagrams of the individual members or of a combination of members. This helps in understanding the structural elements' behavior and ensuring that the structure is stable and can withstand the subjected loads.
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Indeterminate structures refer to structures where internal forces and reactions cannot be determined using only the equations of static equilibrium.  Indeterminate structures have more unknown forces and reaction forces than equations of static equilibrium that can be used to determine them. Indeterminate structures are often used in engineering to create complex, efficient, and aesthetically pleasing structures. There are various types of indeterminate structures used in engineering and some...
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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What is isostructurality? Questions on the definition.

Petra Bombicz1

  • 1Centre for Structural Science, HUN-REN Research Centre for Natural Sciences, Magyar Tudósok körútja 2, Budapest 1117, Hungary.

Iucrj
|December 14, 2023
PubMed
Summary

Isostructurality in crystal engineering allows for property tuning. However, the definition needs clarification on symmetry, stoichiometry, and supramolecular interactions for precise comparisons.

Keywords:
extent of similarityisostructuralitysupramolecular interactionsymmetry

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Area of Science:

  • Crystallography
  • Materials Science
  • Chemical Engineering

Background:

  • Isostructurality is key to understanding close-packing and crystal engineering.
  • Crystal structures tolerate minor molecular changes to fine-tune properties while maintaining isostructurality.
  • Current definitions of isostructurality lack explicit criteria for stoichiometry, symmetry, and supramolecular arrangements.

Purpose of the Study:

  • To investigate the ambiguities in the definition of isostructurality.
  • To explore the criteria for quantitative comparison of isostructural crystals.
  • To propose a reconsideration of the isostructurality definition.

Main Methods:

  • Review of existing definitions and studies on isostructurality.
  • Analysis of structure determination and comparison methodologies.
  • Examination of symmetry, stoichiometry, and supramolecular interactions in isostructural systems.

Main Results:

  • The definition of isostructurality is not explicit regarding stoichiometry, Z', symmetry elements, and space group.
  • Various studies and software self-define criteria for comparing isostructural crystals.
  • The extent of difference and similarity of supramolecular interactions in isostructural crystals are not clearly defined.

Conclusions:

  • The current definition of isostructurality requires reconsideration.
  • Explicit criteria for symmetry, quantitative similarity measures, and supramolecular interactions are needed.
  • A refined definition will enhance the precision and applicability of isostructurality in crystal engineering.