Chelating agents called pincer ligands, useful in transition metal catalysis, are often prepared via “activation” of bonds between these two elements. For 10 points each:
[10e] Name these two elements found in benzene.
ANSWER: carbon AND hydrogen [accept answers in either order; accept C in place of “carbon”; accept H in place of “hydrogen”]
[10m] Most pincer ligands have a value of three for this quantity, the number of donor groups that bind to the central atom of a ligand complex.
ANSWER: denticity [accept polydentate]
[10h] Some pincer ligands have this property, allowing them to lower activation energy of catalytic cycles. Polydentate ligands with this property have coordinating groups with different electronic configurations such that one group is removable but the others are not.
ANSWER: hemilability [or hemilable; accept heteroditopic; prompt on lability or lable]
<Munir Siddiqui, Chemistry>