Structure of the cobalt(III) and cobalt(II) complexes of the cage ligand 1,8-bis(fluoroboro)-2,7,9,14,15,20-hexaoxa-3,6-10,13,16,19-hexaaza-4,5,11,12,17,18-hexamethylbicyclo[6.6.6]eicosa-3,5,10,12,16,18-hexaene