5 6 Limitations
of Crystal
Field
Theory
The homoleptic carbonyls (compounds containing carbonyl ligands
only) are formed by most of the transition metals These carbonyls
have simple, well defined structures Tetracarbonylnickel(0) is
tetrahedral, pentacarbonyliron(0) is trigonalbipyramidal while
hexacarbonyl chromium(0) is octahedral