| Abstract: | In order to know the relationship between structures and physicochemical properties of Group 12 metal(II) ions, the complexes with ‘simple’ ligands, such as alkyl cyclic diamine ligand and halide ions, were synthesized by the reaction of 1,4‐dimethylhomopiperazine (hp′) with MX2 as metal sources (M = Zn, Cd; X = Cl, Br, I). The five structural types, ZnX2(hp′)] (X = Cl ( 1 ), Br ( 2 ) and I ( 3 )), ZnX3(Hhp′)] (X = Cl ( 1′ ) and Br ( 2′ )), CdCl2(hp′)]n ( 4 ), {CdCl2(Hhp′)}2(µ‐Cl)2] ( 4′ ) and {CdX(hp′)}2(µ‐X)2] (X = Br ( 5 ), I ( 6 )), were determined by X‐ray analysis. The sizes of both metal(II) and halide ions and the difference in each other's polarizability influence each structure. All complexes were characterized by IR, far‐IR, Raman and UV–Vis absorption spectroscopies. In the far‐IR and Raman spectra, the typical ν(M? N) and ν(M? X) peaks clearly depend on the five structural types around 540–410 cm?1 and 350–160 cm?1 respectively. The UV–Vis absorption band energy around 204–250 nm also reflects each structural type. Copyright © 2005 John Wiley & Sons, Ltd. |
