Nomenclature, ligands, and classification

https://chem.libretexts.org/Courses/Ripon_College/CHM_321%3A_Inorganic_Chemistry/06%3A_Organometallic_Chemistry/6.02%3A_Nomenclature_Ligands_and_Classification

how to incorporate hapiticity into naming compounds

Hapicity refers to the number of attachment points a ligand has to a central atom in a coordination complex. When naming compounds, it is indicated by the prefix 'mono-', 'bi-', 'tri-', etc., followed by “hapto” before the ligand's name, followed by the coordination number.

name + ligand classification

allyl

X

name + ligand classification

carbonyl

L

name + ligand classification

carbene (alkylidene)

X₂

name + ligand classification

carbyne (alkylidyne)

X₃

name + ligand classification

ethylene

L

name + ligand classification

acetylene

L

name + ligand classification

acyl

X

name + ligand classification

π-allyl (C₃H₅^–)

X for η_¹

LX for η_²

name + ligand classification

cyclopropenyl (cyclo-C₃H₃)

X for η_¹

LX for η_³

name + ligand classification

cyclobutadiene (cycle-C₄H₄)

L₂ for η^₄

name + ligand classification

cyclopentadienyl (cyclo-C₅H₅, Cp)

X for η_¹

LX for η_³

L₂X for η^₅

name + ligand classification

benzene

L₃ for η^₆

name + ligand classification

1,5-cyclooctadiene (1,5-COD)

L₂ for η^₄

metal hitting at center of double bond: L or X

L type

M=[ligand] L or X?

X₂