Fig. 5. Left: X band EPR spectrum of 1 (purple lines) and 2 (black lines) at 4.2 K, with simulation shown in red. Right: Expanded view of the low-field portion of the EPR spectrum. Braces in the inset show the calculated hyperfine splittings of the superposed lower (A^l ≈ 54 G) and upper (A^u ≈ 89 G) sextets. The asterisk denotes an impurity of S = 1/2 with g = 2.00.