and D = -30(2) cm -1 (Figure , middle) No reasonable fit was found using D > 0. The 5 K EPR spectrum shows a sharp, intense resonance at geff = 6.35 with broader major signals at geff = 2.55 and 1.57 (Figure , middle). These features were simulated as an S = 3/2 spin system with the g and D values from the magnetization, also introducing E/D = 0.333. Similar to the spectrum of 8, D strain of 5 cm -1 (17% of D) was necessary to account for line shapes. Unresolved hyperfine coupling to the ammine N nucleus may also contribute to broadening. There are small signals at