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Related Concept Videos

Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
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Structure and Physical Properties of Alkynes02:37

Structure and Physical Properties of Alkynes

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In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
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Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Aldehydes and Ketones with Water: Hydrate Formation01:20

Aldehydes and Ketones with Water: Hydrate Formation

An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
Structure and Bonding of Alkenes02:47

Structure and Bonding of Alkenes

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Dimethylalkoxygallanes: monomeric versus dimeric gas-phase structures.

Caroline E Knapp1, Derek A Wann, Andrzej Bil

  • 1Materials Chemistry Centre, Department of Chemistry, University College London, 20 Gordon Street, London, UK WC1H 0AJ.

Inorganic Chemistry
|February 16, 2012
PubMed
Summary
This summary is machine-generated.

Dimethylalkoxygallanes exhibit distinct gas-phase structures. Donor-functionalized alkoxides form monomeric five-membered rings, while monofunctional alkoxides remain dimeric, revealing key insights into organometallic chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Physical Chemistry

Background:

  • Dimethylalkoxygallanes ([Me(2)Ga(OR)](2)) are known to form dimeric structures in the solid state.
  • The gas-phase behavior of these compounds can differ significantly from their solid-state structures.
  • Understanding the structural dynamics in the gas phase is crucial for applications in materials science and chemical synthesis.

Purpose of the Study:

  • To determine the molecular structures of dimethylalkoxygallane vapors.
  • To investigate the influence of alkoxide functionality (donor-functionalized vs. monofunctional) on gas-phase structure.
  • To elucidate the role of dative bonding in stabilizing monomeric species.

Main Methods:

  • Gas electron diffraction (GED) was employed to analyze the molecular structures in the gas phase.
  • Ab initio molecular orbital calculations were performed to complement the experimental data and provide theoretical insights.
  • Comparative studies were conducted on different types of dimethylalkoxygallanes.

Main Results:

  • Donor-functionalized dimethylalkoxygallanes ([Me(2)Ga(OCH(2)CH(2)NMe(2))](2) and [Me(2)Ga(OCH(2)CH(2)OMe)](2)) exist as monomers in the gas phase.
  • These monomers feature five-membered rings stabilized by intramolecular dative bonds between gallium and the donor atom (N or O).
  • In contrast, the monofunctional analog ([Me(2)Ga(O(t)Bu)](2)) remains dimeric in the gas phase, lacking the possibility for dative bond stabilization.

Conclusions:

  • The gas-phase structure of dimethylalkoxygallanes is dictated by the nature of the alkoxide ligand.
  • Intramolecular dative bonding plays a critical role in the dissociation of dimers into monomers for donor-functionalized compounds.
  • These findings provide fundamental structural information relevant to the reactivity and potential applications of these organometallic compounds.