Novel trigonal prismatic iron complexes of expanded hexadentate Jäger type ligands: synthesis and X-ray analysis

Probing the role of an FeIVtetrazene in catalytic aziridination

“…2C). 31 This EPR spectrum is distinct from Wagner's trigonal prismatic Fe III complexes, 27 which are high spin, as well as the other iron tetrazenes of Riordan and Holland. 18,19 Unlike their results with iron tetrazenes, we have found the ligand behaves in a fully ''innocent'' manner regardless of Fe oxidation state.…”

“…Notably, 2 adopts a trigonal prismatic geometry with a slight twisting distortion (f Ave = 10.41) as opposed to the octahedral geometry seen in 1 (trigonal prismatic, f = 01; octahedral, f = 601). 24 While there are several examples of trigonal prismatic Fe II complexes, 25,26 there are only a few Fe III examples, 27 and to date no examples with Fe IV have been synthesized. The trigonal prismatic geometry is favorable since this reduces steric interactions between the aryl rings on the tetrazene and the aryl rings on the tetracarbene macrocycle.…”

Iron, cobalt and nickel

“…8 Iron(III) complexes of expanded hexadentate Ja¨ger type ligands involving [N 4 O 2 ]-coordination of iron have been synthesised by reaction of [Fe(OAc) 2 ] with the ligands; oxidation of iron occurs even under anaerobic conditions. 9 Cobalt pentaammines [Co(NH 3 ) 5 R] 21 (R ¼ Et, Pr n , Bu n , C 6 H 5 CH 2 CH 2 , 3-NH 2 Pr) have been synthesised. 10 Complexes of the versatile terpy and its derivatives continue to interest.…”