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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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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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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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Crystal Field Theory
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Anion-Cation-Anion Ion Triplet Characterization by Computation and Photoelectron Spectroscopy.

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Researchers studied ion triplets formed by chloride salts of tetramethylammonium and tetraphenylphosphonium cations. These cluster anions are stabilized by C-H···Cl- interactions, influencing their reactivity in solution.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Spectroscopy

Background:

  • Weakly coordinating cations are crucial in various chemical applications.
  • Understanding the structure and stability of ion clusters is essential for predicting reactivity.

Purpose of the Study:

  • To characterize the electronic and structural properties of ion triplets formed by chloride salts of tetramethylammonium (NMe4+) and tetraphenylphosphonium (PPh4+) cations.
  • To investigate the stabilizing interactions within these cluster anions and their dissociation energies.
  • To compare experimental results with theoretical calculations.

Main Methods:

  • Negative ion photoelectron spectroscopy at 20 K.
  • Coupled cluster calculations with single, double, and perturbative triple excitations (CCSD(T)).
  • M06-2X density functional theory calculations.
  • Conductor-like polarizable continuum model (CPCM) calculations.

Main Results:

  • Vertical and adiabatic detachment energies were determined for both ion triplets (Cl-·NMe4+Cl- and Cl-·PPh4+Cl-).
  • CCSD(T) calculations accurately reproduced experimental detachment energies, while M06-2X underestimated them.
  • Five to six C-H···Cl- interactions stabilize the cluster anions, with significant chloride dissociation enthalpies.
  • Solvent effects (dichloromethane) substantially reduce these stabilization energies.

Conclusions:

  • Ion triplets with weakly coordinating cations exhibit significant stabilization through C-H···Cl- interactions.
  • Theoretical methods like CCSD(T) are reliable for describing these systems.
  • The calculated stabilization energies suggest that ion triplets may represent the active species in certain salt reactions in solution.