Synthesis, Characterization and X-ray Structures of the New Dinucleating Ligand 2,8-Dimethyl-1,4,5,6,7,10,11,12-octahydroimidazo[4,5-h] Imidazo[4,5-C][1,6]diazecine-5,11-diethanoic Acid and Its Cu(II) Complex; an Alternating Chain of Cu(II) Ions, Coupled Both Intramolecularly and Intermolecularly