(top, green) at ~10 K, amide complex 9 (middle, purple) at ~5 K, and ammonia complex 10 (bottom, red) at ~10 K as 1 mM solutions in MeTHF. Each spectrum was collected using a 19 G modulation amplitude and a microwave power of either 0.064 mW (8) or 0.020 mW (9 and 10).