Synthesis and structure of polycrystalline adducts of Co(II) azomethine complexes with redox-active 2,4,6,8-tetrakis-(tert-butyl)phenoxazin-1-one

The six-coordinate cobalt complexes, C 57 H 63.50 N 4.50 O 4 Co ( IIa ), C 60 H 69 N 5 O 4 Co ( IIb ), C5 8 H 67 N 3 O 8 Co ( IIc ), C 56 H 61 N 5 O 10 Co ( IId ), C 56 H 63 N 3 O 6 Co ( IIe ), C 58 H 66 N 4 O 6 Co ( IIf ), and C 58 H 63 N 7 O 8 Co ( IIg ), adducts of high-spin tetrahedral Co(II) bis(salicylaldiminates) (C 29 H 24.50 N 3.50 O 2 Co ( Ia ), C 32 H 30 N 4 O 2 Co ( Ib ), C 30 H 28 N 2 O 6 Co ( Ic ), C 28 H 22 N 4 O 8 Co ( Id ), C 28 H 24 N 2 O 4 Co ( Ie ), C 30 H 27 N 3 O 4 Co ( If ), and C 30 H 24 N 6 O 6 Co ( Ig )) and redox-active 2,4,6,8-tetrakis( tert -butyl)phenoxazin-1-one (L), were synthesized and studied for structure and magnetic properties. Complexes IIa–IIg have octahedral structure (CIF files CCDC nos. 1403920 ( IIf ), 1403922 ( IIg )) and exist in the ground low-spin state ( ls -Co III -SQ), which arises upon intramolecular single-electron redox process in the ligand–metal system. The presence of substituents of different nature in the azomethine ligands of IIa–IIg does not induce any significant changes in their magnetic properties.