These results indicate the coexistence of HS iron(II) (Fe( )) and LS iron(II) (Fe(1)) centers in 1 at 170 K. ). These N-Fe-N angles are significantly larger than that observed at 280 K. The average Fe-N bond distance difference between HS (280 K) and LS state (110 K) in 1 is 0.142 Å, which accords with the expected trend in iron(II) SCO complexes.