Question
Because of the 16-electron count of many square planar complexes, they typically undergo associative types of these reactions. For 10 points each:
[10e] Name these reactions by which a ligand in a complex is replaced by another incoming ligand. In organic molecules, these reactions occur via the SN2 and SN1 mechanisms.
ANSWER: ligand substitution
[10h] Most ligand substitutions occur via this mechanism, which is intermediate to associative and dissociative mechanisms. This mechanism is characterized by the formation of a short-lived, undetectable intermediate.
ANSWER: interchange mechanism [or concerted mechanism]
[10m] The Jahn-Teller distortion can accelerate ligand substitution for complexes with this geometry by weakening the metal-ligand bond. Fac-mer isomerism occurs in complexes with this geometry, which tend to have higher splitting energy.
ANSWER: octahedral [or square bipyramidal]
<JZ, Chemistry>
Summary
| 2024 ARCADIA at BU | 2024-12-06 | Y | 8 | 7.50 | 63% | 13% | 0% |
| 2024 ARCADIA at Duke | 2024-12-06 | Y | 3 | 16.67 | 100% | 33% | 33% |
| 2024 ARCADIA at Missouri S&T | 2024-12-06 | Y | 1 | 30.00 | 100% | 100% | 100% |
| 2024 ARCADIA at Missouri S&T | 2024-12-06 | Y | 2 | 10.00 | 50% | 50% | 0% |
| 2024 ARCADIA Online | 2025-05-17 | Y | 5 | 18.00 | 100% | 80% | 0% |
| 2024 ARCADIA at Penn State | 2024-12-06 | Y | 2 | 10.00 | 100% | 0% | 0% |
| 2024 ARCADIA at Florida Tech | 2024-12-06 | Y | 4 | 15.00 | 75% | 75% | 0% |
| 2024 ARCADIA at UC Berkeley | 2024-12-06 | Y | 2 | 15.00 | 100% | 50% | 0% |
| 2024 ARCADIA at Waterloo | 2024-11-09 | Y | 6 | 18.33 | 83% | 67% | 33% |
| 2024 ARCADIA at GT | 2024-12-06 | Y | 4 | 15.00 | 75% | 50% | 25% |
| 2024 ARCADIA at Illinois | 2024-11-09 | Y | 4 | 17.50 | 100% | 75% | 0% |
| 2024 ARCADIA at Warwick | 2024-12-06 | Y | 5 | 14.00 | 100% | 40% | 0% |
| 2024 ARCADIA at Claremont | 2024-11-02 | Y | 3 | 13.33 | 100% | 33% | 0% |
Data
| Cambridge B | Warwick A | 10 | 0 | 10 | 20 |
| LSE B | Imperial B | 10 | 0 | 0 | 10 |
| LSE A | Southampton | 10 | 0 | 0 | 10 |
| Warwick B | Cambridge A | 10 | 0 | 10 | 20 |
| Bristol | Warwick C | 10 | 0 | 0 | 10 |