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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

19.2K
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...
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.6K
Stereoisomerism02:52

Stereoisomerism

11.9K
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...
11.9K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

200
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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Crystal Clear: Decoding Isocyanide Intermolecular Interactions through Crystallography.

Eleftheria Chatziorfanou1, Atilio Reyes Romero2,3,4, Lotfi Chouchane2,3,4

  • 1Innovative Chemistry Group, Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry and Czech Advanced Technology and Research Institute, Palacky University in Olomouc, Olomouc 779 00, Czech Republic.

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Isocyanides exhibit unique dual reactivity due to their terminal carbon. This study analyzes their solid-state intramolecular interactions, revealing insights into hydrogen bonding, halogen bonding, and C-C interactions, crucial for various chemical applications.

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Area of Science:

  • Organic Chemistry
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Isocyanides possess unique electronic properties, combining electrophilic and nucleophilic characteristics at the terminal carbon.
  • This dual functionality influences their intermolecular interactions and overall reactivity.
  • Understanding these interactions is key to harnessing isocyanide chemistry.

Purpose of the Study:

  • To investigate the diverse intramolecular interactions of isocyanides in the solid state.
  • To analyze non-covalent interactions involving the isocyanide functional group.
  • To exclude isocyanide-metal complexes from the analysis.

Main Methods:

  • Utilized the Cambridge Crystallographic Database for structural analysis.
  • Examined various classes of intramolecular interactions, including hydrogen bonds, halogen bonds, and C-C interactions.
  • Focused on solid-state structures to understand packing and intermolecular forces.

Main Results:

  • Identified and categorized isocyanide interactions as hydrogen bond acceptors (RNC···HX).
  • Documented halogen bonding interactions involving isocyanides (RNC···X).
  • Observed significant interactions between isocyanide and carbon atoms (RNC···C), illustrating Bürgi-Dunitz trajectories.

Conclusions:

  • Isocyanides participate in a wide array of intramolecular interactions in the solid state.
  • These interactions, particularly RNC···C, are vital for understanding multicomponent reactions like Ugi and Passerini.
  • Knowledge of these interactions has broad implications for medicinal chemistry, materials science, and catalysis.