ligands - 2025 ACF Regionals

Question

Tanabe–Sugano diagrams plot the quotient of a splitting energy symbolized Dq induced by these compounds and the Racah B parameter. For 10 points each:

[10e] Name these compounds whose binding to metal cations to form coordination complexes is described by crystal field theory. The spectrochemical series sorts these compounds by increasing strength.

ANSWER: ligands

[10m] In crystal field theory, ligand binding causes the five d orbitals to split into two orbitals, one of which is triply degenerate and lower in energy and the other of which is doubly degenerate and higher in energy. Name either.

ANSWER: t-sub-2g OR e-sub-g

[10h] These diagrams qualitatively describe electronic energies in weak field transition metal complexes. These diagrams describe the symmetries of spin-allowed transitions and can be denoted D, F, or P.

ANSWER: Orgel diagrams

<Claremont, Chemistry>

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Summary


Florida	2025-02-01	Y	3	6.67	33%	33%	0%
Great Lakes	2025-02-01	Y	6	10.00	83%	17%	0%
Lower Mid-Atlantic	2025-02-01	Y	6	6.67	67%	0%	0%
Midwest	2025-02-01	Y	6	11.67	83%	33%	0%
North	2025-02-01	Y	3	3.33	33%	0%	0%
Northeast	2025-02-01	Y	6	16.67	17%	83%	67%
Overflow	2025-02-01	Y	5	10.00	60%	40%	0%
Pacific Northwest	2025-02-01	Y	2	0.00	0%	0%	0%
South Central	2025-02-01	Y	2	20.00	100%	50%	50%
Southeast	2025-02-01	Y	4	15.00	100%	50%	0%
UK	2025-02-01	Y	10	11.00	70%	30%	10%
Upper Mid-Atlantic	2025-02-01	Y	8	7.50	63%	13%	0%
Upstate NY	2025-02-01	Y	3	0.00	0%	0%	0%

Data


Florida B	Florida State A	10	10	0	20
UCF B	Florida A	0	0	0	0
UCF C	Valencia A	0	0	0	0
Carnegie Mellon A	Case Western B	10	0	0	10
Michigan B	Case Western A	10	0	0	10
Kenyon	Michigan State	0	0	0	0
Michigan A	Carnegie Mellon B	10	0	0	10
Michigan C	Michigan D	10	0	0	10
Ohio State A	Ohio State B	10	10	0	20
Duke	Wake Forest	10	0	0	10
Liberty C	Liberty A	0	0	0	0
Virginia Tech A	Liberty B	10	0	0	10
South Carolina	UNC C	10	0	0	10
UNC D	UNC B	0	0	0	0
Virginia A	William & Mary	10	0	0	10
Chicago B	Chicago D	10	0	0	10
Chicago C	Chicago A	10	10	0	20
Missoui S&T	Illinois B	0	0	0	0
Indiana A	Illinois C	10	0	0	10
Missouri	Illinois A	10	0	0	10
WashU B	WashU A	10	10	0	20
Wisconsin B	Iowa State	0	0	0	0
Minnesota B	Wisconsin A	10	0	0	10
Winona State	Carleton	0	0	0	0
BU	Dartmouth A	0	0	0	0
Tufts A	Brandeis B	0	0	0	0
Brandeis A	Brown A	0	0	0	0
Brown A	Brandeis A	0	10	10	20
Harvard A	MIT A	10	10	0	20
UMass Boston	Harvard B	0	0	0	0
Georgetown A	Notre Dame B	0	0	0	0
Notre Dame A	Georgetown B	10	0	0	10
Iowa	Northwestern B	0	0	0	0
Northwestern A	Purdue	10	10	0	20
Stanford B	Notre Dame C	10	10	0	20
UW B	Alberta	0	0	0	0
UW A	UBC	0	0	0	0
Texas A	ASU	10	0	0	10
Texas B	TAMU	10	10	10	30
Georgia Tech A	Alabama A	10	0	0	10
Georgia Tech D	Louisville A	10	10	0	20
Tennessee A	Georgia Tech B	10	0	0	10
Georgia Tech C	Vanderbilt A	10	10	0	20
Southampton A	Bristol	0	0	0	0
Cambridge A	Southampton B	10	0	0	10
Durham	Cambridge C	10	0	0	10
Imperial B	Cambridge B	10	10	0	20
LSE	Warwick B	10	0	0	10
Manchester	Oxford B	10	0	0	10
NYU C	Cambridge E	0	0	0	0
Oxford A	Sheffield	10	10	10	30
Oxford C	Cambridge D	0	0	0	0
Imperial A	Warwick A	10	10	0	20
Rutgers A	Cornell B	10	0	0	10
George Washington A	Columbia C	0	0	0	0
George Washington B	Maryland A	0	0	0	0
Vassar A	Haverford A	10	0	0	10
Penn B	Haverford B	10	0	0	10
Columbia B	John Jay College	10	10	0	20
NYU A	Penn A	10	0	0	10
Yale A	Johns Hopkins A	0	0	0	0
ESF A	Cornell C	0	0	0	0
RIT A	Binghamton A	0	0	0	0
RIT B	Cornell D	0	0	0	0