Fig. 1. X-ray crystal structure of I shown with 50% thermal ellipsoids. One disordered tert-butyl group (at the C19 atom), cyclohexane and H atoms are omitted for clarity. Selected bond lengths [Å] and angles [°]: Co–O1 1.858(2), Co–O2 1.878(2), Co–N1 1.872(3), Co–N2 1.872(3), Co–C31 1.895(4); O1–Co–O2 85.32(9), O1–Co–N1 93.84(10), N2–Co–O2 93.96(10), N2–Co–N1 85.37(11), O1–Co–C31 96.95(13), O2–Co–C31 92.32(13), N1–Co–C31 94.67(14), N2–Co–C31 95.40(14).