Crystal Structures and Magnetic Properties of Sparteinium Tetrahalocuprate Monohydrate Compounds

摘要

The crystal structures of Sparteinium tetrachlorocuprate monohydrate [(C_(15)H_(28)N_2)CuCl_4 centre dot H_2O],1 and Sparteinium tetrabromocuprate monohydrate [(C_(15)H_(28)N_2)CuBr_4 centre dot H_2O],2,were determined.The structures of 1 [orthorhombic,P2_12_12_1,a=8.3080(10) A,b=14.6797(19) A and c=16.4731(17) A],and 2 [orthorhombic,P2_12_12_1,a=8.4769(7) A,b=15.166(3) A and c=16.679(3) A],are composed of a doubly protonated Sparteinium cation,[C_(15)H_(28)N_2l~(2+),a discrete CuX_4~(2-) anion (X=Cl~- or Br~-),and one water molecule.These monomeric compounds are stabilized through various types of hydrogen bonding interaction in their packing structures.Crystal 2 exhibits weak anti-ferromagnetism (J=-3.24 cm~(-1)) as opposed to the magnetically isolated paramagnetism observed for 1.The results of comparative magneto- structural investigations of 1 and 2 suggest that the pathway for the weak anti-ferromagnetic super-exchange in 2 might be through a Cu-Br...Br-Cu contact.