Question

What Is The Structure Of Pentavalent Coordination Compounds Using Crystal Field Theory Specifically ${\mathrm{FeCO}}_5$?

Answer 1

Trigonal bipyramidal structures exist in pentavalent coordination molecules.

This is due to the following reasons:

• The $\mathrm{CO}$ group is a strong field ligand with a neutral charge, electrons are forced to pair up due to a vacant ${\mathrm{\pi }}^{*}$orbital.
• The ${\mathrm{dsp}}^3$ hybrid orbital is formed by combining one pair of d electrons (from the 3d orbital), one pair of s electrons (from the 4s orbital), and three pairs of p electrons (from the 4p orbital).
• The electronic configuration of Iron is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{6}4{\mathrm{s}}^2$.
• Carbonyl is a strong field ligand it helps in the pairing of electrons.

This explains that's why the molecule has a trigonal bipyramidal form.

62ac8738096e2afa13c4685c

62ac8738096e2afa13c4685c