Following this idea, we introduced a second NO 2 substituent, and computed the spinstate energy gap for the [Cr(Cp 1,3-NO 2 ) 2 ] molecule. For that molecule, H=3.62 kcal mol -1 and S = 10.0 cal K -1 mol -1 , thus making its T 1/2 = 362 K, a value that makes it a potential candidate for exhibiting SCO behaviour.