Structures that should be Described in Higher-Symmetry,Centrosymmetric Space Groups. Part 2. The Structures of[Ni(C5H4NO-2-CH=N-CH2CH2-N = CH-2-C5H4NO)(H2O)2](ClO4)2,{Ni[C5H4NO-2-CH = N-CH(CH3)CH2-N = CH-2-C5H4NO](H2O)2}(ClO4)2,{Cu[(C5H4NO-2-CH = N-N = C |