Question
Answer the following about rhenium compounds. For 10 points each:
[10m] A rhenide ion bound to nine of these ligands constitutes the most notable example of a nona•coordinate complex. The strong reducing agent LAH features four of these ligands coordinating with an aluminum atom.
ANSWER: hydride [or H-minus; accept lithium aluminum hydride; prompt on hydrogen ion or H; reject “hydronium” or “H-plus”]
[10e] In 1962, La Placa (“PLAH-kah”) and Post discovered a rhenium diboride material possessing a high value for this property. For minerals, this property is qualitatively measured using the Mohs scale.
ANSWER: hardness [accept Mohs hardness number]
[10h] One of these structures, first explicitly identified by F. Albert Cotton, appears between two rhenium atoms in potassium octachlorodirhenate (“OCK-tah-klor-roe-DAI-ree-nayt”). At ground-state, these structures can be represented with the notation sigma-2, pi-4, delta-2.
ANSWER: quadruple bonds [accept delta bonds; prompt on covalent bonds]
<Kane Nguyen, Chemistry>
Summary
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