One of these functional groups acts as a pendant ligand in the secondary coordination sphere in the hangman effect. Six ligands containing this functional group bridge three palladium(II) (“two”) atoms in a triangle in an activated catalyst for the Heck reaction. This group coordinates the metals in the “paddlewheel” secondary binding units of HKUST-1 (“H-kust-one”). Metalloenzyme ligands containing this functional group in an amino acid side chain can switch from monodentate to bidentate. These functional groups lie at each end in the most common MOF (“moff”) linkers. The electrostatic repulsion between caps containing these functional groups stabilizes colloidal gold. Two amines and four of these functional groups chelate (“KEE-late”) a metal in EDTA. This functional group has a pKa of 5 and is found in the side chain of the amino acids symbolized D and E. For 10 points, name this negatively charged functional group found in citrate and acetate. ■END■
ANSWER: carboxylate [or carboxylic acid; or carboxyl group; or CO2−; or COO−; or COOH; accept dicarboxylic acids or dicarboxylates; prompt on acids; prompt on acetates; reject “carbonyl” or “hydroxyl” or “alcohol”] (The second sentence refers to palladium acetate.)
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= Average correct buzz position