An Unusual Cleavage and Macrocyclization in the Zinc-Aqueous Acid Reduction of [2-Methyl-2-Nitro-N,N'-Bis(Pyridin-2-Ylmethyl)-Propane-1,3-Diamine]Coppe R(II) Cation - Crystal-Structure of the (6,13-Dimethyl-1,4,8,11-Tetraazacyclotetradecane-6,13-Diamine)Copper(II) Perchlorate Product