Synthesis, Characterization and Crystal Structure Determination of Copper (II) Complexes with 2,2′-Dimethyl-4,4′-bithiazole

Copper(II)  complex  [Cu(dmbt)2(H2O)](ClO4)2 (1)  was  prepared  from  the  reaction  of  copper(II) perchlorate  hexahydrate  with  2,2'-dimethyl-4,4'-bithiazole  (dmbt)  ligand  in  methanol  at  ambient temperature. The complex was quantitatively and qualitatively characterized by elemental analysis, absorption  and  infrared  spectrometries.  Complex  [Cu(DMSO)5](ClO4)2 (2)  was  also  synthesized from  the  recrystallization  of  complex  [Cu(dmbt)2(H2O)](ClO4)2  (1)  in  the  dimethyl  sulfoxide solvent  through  a  slow  evaporation  of  the solvent  at  room  temperature.  The  compound  was characterized  by  elemental  analysis,  infrared  spectrometry  and  single-crystal  X-ray  diffraction. Crystallographic  analysis  of  this  complex  revealed  that  the  single  crystal  of  this  compound  is crystallized in the trichlinic crystal structure, with the space group Pī and cell dimensions of a = 10.894(3), b = 10.853(4) and c = 12.947(5)Å as well as the angle β = 111.95 (3)°.Interestingly, this compound is the first example of 5-coordinated copper(II) complex with dimethyl-sulfoxide ligand in a square pyramid structure.