Encyclosphere.org ENCYCLOREADER
  supported by EncyclosphereKSF

Electron accountancy

From Wikiversity - Reading time: 1 min
Subject classification: this is a chemistry resource.
Type classification: this is a lesson resource.

Aims

[edit | edit source]

This Lesson will cover:

  • Revision of electron counting methods
  • The Covalent Bond Classification as an alternative method
  • Simple classes of ligand and bond ambiguities
  • Curly arrow conventions in complexes
  • Composite ligands
  • Formal oxidation state and the d-electron count
  • Coordination number and ambiguities


Classes of ligand

[edit | edit source]

L ligands (2e donors)

[edit | edit source]
  • PR3, N2, C2H4, CO, H2, C2H2
  • observed as neutral

X ligands (1e donors)

[edit | edit source]
  • H, halides, R (alkyl), Ar (aryl), COR (acyl), OR (alkoxides), NR2
  • observed as anions


Composite ligands

[edit | edit source]

Electron counting

[edit | edit source]

The number of electrons donated by the metal = its group number.


Valence Number (VN)

VN = number of X ligands + charge on complex


Coordination Number (CN)

CN = number of atoms bonded to the metal CN = number of electron pairs added to the metal CN = number of ligands bonded to the metal


Ligand Bond Number (LBN)

LBN = sum of L and X ligands

Licensed under CC BY-SA 3.0 | Source: https://en.wikiversity.org/wiki/Electron_accountancy
9 views |
↧ Download this article as ZWI file
Encyclosphere.org EncycloReader is supported by the EncyclosphereKSF