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why axial bonds are shorter than equatorial bond in iron penta carbonyl?

why axial bonds are shorter than equatorial bond in iron penta carbonyl?

Grade:12th pass

2 Answers

Aarti Gupta
askIITians Faculty 300 Points
9 years ago
Iron pentacarbonyl,Fe(CO)5 is an molecule of transition metal with non-spherical d-subshell.It has trigonal bipyramidal geometry, having axial bonds which are shorter than equatorial bond which are longer.This molecule has d8 configuration.Shorter axial bonds than equatorial is due to the result of interaction with the d sub-shell.
Vijay Malav
15 Points
2 years ago
Shorter bond length is due Zin jahn teller distortion. In Fe complex
There is also berry pesudo rotation which decrese axial bond length. 

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