Solution Studies of the Cobalt(II) N-rac- and N-meso-CoL2+ Isomers and Molecular and Crystal Structures of the Low-Spin, Five-Coordinate Cobalt(II) Macrocyclic Complexes N-rac-(CoL(H2O))(ClO4)2·0.6 H2O and N-rac-(CoL(OClO3))ClO4 (L: 5