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X-ray structure of compound 9a.31 Hydrogen atoms and disordered iodide atoms in I3– counterion are omitted for clarity. Selected distances (Angstroms): Ni1–Ni2 = 2.84; Ni1–I1 = Ni2–I1 = 2.92; Ni1–O1 = Ni1–O2 = Ni2–O1 = Ni2–O2 = 2.00; Ni1–N1 = 1.99; Ni1–N2 = 2.05; Ni1–C1 = 2.013. Selected angles (degrees): Ni1–I1–Ni2 = 58.07; Ni1–O1–Ni2 = 92.72; O1–Ni1–O2 = 79.57.
