Thermal ellipsoid drawing of 9b. Ellipsoids are displayed at 50% probability level. Hydrogen atoms are omitted. Selected distances (Å) and angles (deg): W(1)-N(1) = 2.0540(18) Å, W(1)-N(2) = 1.7571(19) Å, W(1)-O(1) = 1.9797(14) Å, W(1)-C(1) = 2.049(2) Å, W(1)-C(3) = 2.077(2) Å, C(61)-C(81) = 3.405 Å, W(1)-N(2)-C(61) = 164.32(16)°, N(2)-W(1)-O(1) = 173.29(7)°, W(1)-O(1)-C(11) = 157.73(14)°.