Fig. 4. Crystal structure of 8. Note that the dimeric structure is shown although the asymmetric unit only contains one Ni center. Ellipsoids are shown at 50% except for aryl rings which are shown in wireframe. Hydrogen atoms bound to C have been omitted for clarity. Dashed lines indicate a hydrogen bonding interaction. C atoms shown in gray, N in blue, and Ni in green. Selected bond distances (Å) and angles (°) (* indicates a bond to the symmetric equivalent): Ni–N2 = 1.908(1), Ni–N6 = 1.813(1), Ni–N9 = 1.929(1), Ni–Ni* = 2.624(5), Ni–N2* = 1.929(1), N2–N3 = 1.451(1), N3–C4 = 1.302(2), C25–C26 = 1.453(2), C8–N9 = 1.317(2), N9–N10 = 1.413(1), N10–H···N3* = 2.02(2), N3–N10* = 2.815(2), N2–Ni–N10 = 171.45(5), N2–Ni–N6 = 91.41(5), N10–Ni–N6 = 82.13(5).
