X-ray structure of 9 with H atoms omitted for clarity. Ellipsoids are drawn at
30% probability. Selected bond lengths (Å): Re1–O4 2.125(4),
Re1–N4 2.172(4), Re1–N2 2.233(4), Re1–C2 1.909(5),
Re1–C3 1.915(5), Re1–C1 1.914(6). Selected bond angles
(deg): O4–Re1–N1 78.4(1), O4–Re1–N2 78.6(1),
O4–Re1–C2 174.7(2), O4–Re1–C3 96.8(2),
O4–Re1–C1 94.7(2), N1–Re1–N2 77.1(1),
N1–Re1–C2 97.7(2), N1–Re1–C3 173.4(2),
N1–Re1–C1 96.4(2), N2–Re1–C2 97.1(2),
N2–Re1–C3 97.5(2), N2–Re1–C1 171.4(2),
C2–Re1–C3 86.7(2), C2–Re1–C1 89.3(2),
C2–Re1–C1 88.6(2).