pi bond - 2024 ACF Winter at Clemson

Question

Answer the following about the structure of the iron pentacarbonyl metal complex, for 10 points each.

[10e] The carbonyl ligands bond to the iron with an antibonding orbital via this interaction, termed its namesake “backbonding.” P-orbitals overlap laterally in this interaction, which is found with a sigma bond in double bonds.

ANSWER: pi bond [accept pi backbonding]

[10m] Iron pentacarbonyl exhibits a low but present rate of Berry pseudorotation due to having this coordination geometry. In VSEPR theory, molecules with this geometry have three equatorial and two axial substituents.

ANSWER: trigonal bipyramidal

[10h] Iron pentacarbonyl obeys this statement governing the stability of transition metal complexes. Coordinatively saturated complexes satisfy this statement, but d8 complexes like Zeise’s salt are common counterexamples.

ANSWER: 18-electron rule

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Summary


2024 ACF Winter at UC Berkeley	2024-11-16	Y	3	20.00	100%	100%	0%
2024 ACF Winter at Clemson	2024-11-16	Y	8	13.75	75%	63%	0%
2024 ACF Winter at Clemson	2024-11-16	Y	8	18.75	25%	100%	63%
2024 ACF Winter at Lehigh	2024-11-16	Y	9	20.00	89%	89%	22%
2024 ACF Winter at Northwestern	2024-11-16	Y	9	17.78	78%	89%	11%
2024 ACF Winter at Ohio State	2024-11-16	Y	8	11.25	50%	63%	0%
2024 ACF Winter at Online	2024-11-16	Y	9	8.89	56%	22%	11%
2024 ACF Winter at UBC	2024-11-16	Y	3	20.00	100%	100%	0%
2024 ACF Winter at Oxford	2024-11-16	Y	11	11.82	55%	55%	9%
2024 ACF Winter at Brandeis	2024-11-16	Y	10	12.00	60%	50%	10%

Data


Georgia Tech B	Alabama A	10	10	0	20
Georgia Tech B	Tennesse A	0	10	0	10
Georgia Tech B	Alabama A	10	10	0	20
Georgia Tech B	Tennesse A	0	10	0	10
Auburn A	Georgia Tech A	10	10	0	20
Auburn A	Tusculum A	0	10	0	10
Auburn A	Georgia Tech A	10	0	0	10
Auburn A	Tusculum A	0	0	0	0
Tusculum A	Clemson A	0	0	0	0
Tennesse A	Emory A	10	10	0	20
Georgia Tech E	Auburn B	10	10	0	20
Georgia Tech E	Alabama A	10	10	0	20
Georgia Tech E	Auburn B	10	0	0	10
Georgia Tech E	Alabama A	10	0	0	10
Georgia A	Georgia Tech F	10	10	0	20
Georgia A	Emory A	10	10	0	20
Georgia A	Georgia Tech F	10	10	0	20
Georgia A	Emory A	10	10	0	20
Georgia Tech C	South Carolina A	10	10	0	20
Georgia Tech C	Emory B	0	10	0	10
Georgia Tech C	South Carolina A	10	10	0	20
Georgia Tech C	Emory B	0	10	0	10
Emory B	Tennesse B	0	10	0	10
Georgia Tech E	Auburn B	10	10	10	30
Georgia Tech E	Alabama A	10	10	10	30
Georgia Tech E	Auburn B	10	0	10	20
Georgia Tech E	Alabama A	10	0	10	20
Auburn A	Georgia Tech A	10	10	10	30
Auburn A	Tusculum A	0	10	10	20
Auburn A	Georgia Tech A	10	0	10	20
Auburn A	Tusculum A	0	0	10	10
Auburn B	Auburn C	0	10	0	10
Georgia A	Georgia Tech F	10	10	10	30
Georgia A	Emory A	10	10	10	30
Georgia A	Georgia Tech F	10	10	10	30
Georgia A	Emory A	10	10	10	30
Georgia Tech B	Alabama A	10	10	0	20
Georgia Tech B	Tennesse A	0	10	0	10
Georgia Tech B	Alabama A	10	10	0	20
Georgia Tech B	Tennesse A	0	10	0	10
Georgia Tech C	South Carolina A	10	10	0	20
Georgia Tech C	Emory B	0	10	0	10
Georgia Tech C	South Carolina A	10	10	0	20
Georgia Tech C	Emory B	0	10	0	10
Georgia Tech D	Tennesse B	0	10	10	20
Georgia Tech A	South Carolina A	0	10	10	20