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Crystal Field Theory - Octahedral Complexes02:58

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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...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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C5 Pentacle Structures: A Localization-Delocalization Matrices Approach.

Julien Pilmé1, Riccardo Spezia1

  • 1Sorbonne Université, L, aboratoire de Chimie Théorique, UMR 7616 CNRS, 4 Place Jussieu, 75005, Paris, France.

Chemistryopen
|May 16, 2024
PubMed
Summary

Researchers investigated carbon-five (C5) molecules, discovering a unique "pentacle" bonding structure in cyclic arrangements. This unusual bonding, also found in cyclopentadienyl, challenges traditional chemical bond understanding.

Keywords:
Astrochemical moleculesDFT calculationsELFQTAIMValence Bond Theory

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Materials Science

Background:

  • Understanding the bonding in small carbon clusters is crucial for predicting their chemical properties.
  • Previous studies have explored various carbon allotropes, but the specific bonding in C5 remains an area of interest.

Purpose of the Study:

  • To explore the potential existence of a pentacle valence bond structure in cyclic C5 molecules.
  • To elucidate the arrangement and nature of chemical bonds in linear, cyclic, and 3D C5 structures.

Main Methods:

  • Utilized quantum chemistry tools for theoretical calculations.
  • Employed Density Functional Theory (DFT) for electronic structure analysis.
  • Applied the localization-delocalization matrices approach to characterize bonding.

Main Results:

  • Identified the linear C5 structure as the most stable.
  • Obtained local minima for bi- and three-dimensional C5 structures.
  • Characterized the linear C5 structure as a mix of ionic and covalent bonds with near-identical bond distances.
  • Revealed a significant 'pentacle' bonding arrangement in cyclic C5, indicating an unusual formal configuration with five intersecting C-C bonds.
  • Confirmed the presence of this pentacle arrangement in the known molecule cyclopentadienyl.

Conclusions:

  • The pentacle bonding structure is a significant Lewis structure for cyclic C5.
  • This unusual bonding configuration is also observed in related molecules like cyclopentadienyl.
  • The findings provide new insights into the bonding diversity of small carbon systems.