The Crystal and Molecular Structure of [Co(tmen) 3 ](C 7 H 7 SO 3 ) 3 ·2 H 2 O and [Co(tmen) 3 ](CH 3 SO 3 ) 2 ·EtOH·1/2 H 2 O (tmen = 2,3‐dimethylbutane‐2,3‐diamine)

The molecular structure of the two complex ions [Co(tmen) 3 ] 3+ and [Co(tmen) 3 ] 2+ (tmen = 2,3‐dimethylbutane‐2,3‐diamine) have been determined at 100 K. They show a strong trigonal distortion of the octahedral CoN 6 core. The twist angle is 26.2(2.8)° for Co II and 43.9(9)° for Co III . Average CoN distances are 2.193(13) Å (Co II ) and 1.997(2) Å (Co III ), 0.02 Å longer than for the main body of Co III amines.