Question
This phenomenon is represented by a line that connects a metal to the bond of a hydrogen atom and R group when describing sigma complexes. For 10 points each:
[10h] Name this phenomenon in coordination chemistry in which a d orbital can be filled by interacting with a covalent bond between a hydrogen and a carbon on a ligand.
ANSWER: agostic interactions
[10m] Agostic interactions result in the formation of one of these electron-deficient bonds also exhibited by trihydrogen and diborane. These types of bonds in boron-hydrogen cluster compounds are described by Wade’s rules.
ANSWER: three-center two-electron bonds [or 3c-2e bonds]
[10e] 3c-2e bonds often create complexes with this geometry. Water takes on this geometry due to its two lone pairs according to VSEPR theory.
ANSWER: bent [accept angular or V-shaped]
<Chemistry>
Summary
| 2025 ACF Nationals | 04/19/2025 | Y | 24 | 15.00 | 100% | 38% | 13% |
Data
| Arizona State | Yale | 0 | 10 | 10 | 20 |
| Chicago B | Harvard | 0 | 0 | 10 | 10 |
| Columbia A | UC Berkeley A | 0 | 0 | 10 | 10 |
| Columbia B | Winona State | 0 | 0 | 10 | 10 |
| Georgia State | Florida | 0 | 0 | 10 | 10 |
| Illinois A | Chicago A | 0 | 10 | 10 | 20 |
| Northwestern | Indiana | 10 | 10 | 10 | 30 |
| Georgia Tech | Iowa State | 0 | 0 | 10 | 10 |
| Cornell A | Johns Hopkins | 10 | 10 | 10 | 30 |
| MIT | Virginia Tech | 0 | 10 | 10 | 20 |
| Maryland | Ohio State | 0 | 0 | 10 | 10 |
| Cornell B | North Carolina B | 0 | 0 | 10 | 10 |
| UC Berkeley B | Ottawa | 0 | 0 | 10 | 10 |
| LSE | Penn State | 0 | 0 | 10 | 10 |
| Michigan | RIT | 0 | 0 | 10 | 10 |
| North Carolina A | Rutgers | 0 | 0 | 10 | 10 |
| Waterloo A | Stanford | 0 | 10 | 10 | 20 |
| Texas | Toronto B | 0 | 0 | 10 | 10 |
| Toronto A | WUSTL A | 0 | 10 | 10 | 20 |
| Minnesota | Toronto C | 0 | 0 | 10 | 10 |
| UCF | Illinois B | 0 | 10 | 10 | 20 |
| Vanderbilt | Virginia | 0 | 0 | 10 | 10 |
| NYU | WUSTL B | 0 | 10 | 10 | 20 |
| Waterloo B | British Columbia | 10 | 0 | 10 | 20 |