Synthesis and Structural Features of Co(II) and Co(III) Complexes Supported by Aminotrisphenolate Ligand Scaffolds

Co­(II) complexes
of aminotrisphenolate ((ArO)3N3–) ligands
can be prepared straightforwardly in high yield. X-ray analysis reveals
these complexes to comprise of two different hemispheres, one containing
an anionic Co­((ArO)3N)− and the other
a cationic (ArO)3NH+ unit, which are associated
through hydrogen bonding. These Co­(II) complexes can be easily converted
into their Co­(III) analogues in air in the presence of suitable bases
such as dimethylaminopyridine and 2,2′-bipyridine, and the
structural features and magnetic properties of these latter compounds
are also reported.

以氨基三酚盐（aminotrisphenolate，(ArO)3N3–）为配体的二价钴（Co(II)）配合物可经简便途径高产率合成。X射线分析结果显示，该类配合物包含两种不同的半球状结构单元：其一为阴离子型Co((ArO)3N)−，另一为阳离子型(ArO)3NH+单元，二者通过氢键相互作用结合。上述二价钴配合物在空气氛围中，于合适碱（如二甲基氨基吡啶与2,2'-联吡啶）存在时，可便捷转化为对应的三价钴（Co(III)）配合物；本文同时报道了此类三价钴配合物的结构特征与磁学性质。