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. 2015 Jun 30;71(Pt 7):1572–1581. doi: 10.1107/S1399004715009438

Table 2. CO bond distances in the 7-propionate group of haem (in ).

The values in parentheses represent the estimated standard deviations derived from least-squares refinement using SHELXL.

  Oxidized form 1 Oxidized form 2 Reduced form 1 Reduced form 2
CO1 1.252 (9) 1.273 (17) 1.225 (10) 1.289 (17)
CO2 1.251 (8) 1.278 (16) 1.252 (9) 1.237 (19)