Syntheses, Structures and Magnetic Properties of Trinuclear Cu 11M11Cu11 (M = Cu, Ni, Co and Fe) and Tetranuclear [2×1+1×2] Cunmnn2Cun Complexes Derived from a Compartmental Ligand: The Schiff Base 3-Methoxysalicylaldehyde Diamine Can Also Stabilize a Cocrystal