He took a recording of Berlioz's Symphonie Fantastique to play in the empty orbital
capsule while waiting for his crewmates to return from the lunar surface.
The bulky mesityl groups serve to protect this empty orbital
from attack by external nucleophiles giving rise to air-stable materials which exhibit strong intramolecular charge transfer transitions.
At the heart of coordination chemistry lies the coordinate bond, in its simplest sense arising from donation of a pair of electrons from a donor atom to an empty orbital
on a central metalloid or metal.