An Investigation of Z-in Distortion in Mononuclear Cu(II) Complex with Terpyridine Ligands, [Cu(terpy)۲](PF۶)۲

The first crystal structure of  [Cu(terpy)۲](PF۶ )۲ , where terpy=۲,۲':۶',۲"-terpyridine is reported. Green crystals of  [Cu(terpy)۲](PF۶ )۲ were grown by ether diffusion into an acetonitrile solution of the complex. Crystal structure of this complex is tetragonal ( space group: P۲۱c ) with a = ۸.۸۹۱۶(۳), c = ۲۰.۰۲۱۴(۱۳) Å, and z = ۲. The structure was refined by using ۱۸۲۸ independent reflections with I > ۲σ(I) to a R  factor of ۰.۰۸۰۹. The terpy ligands are tridentate and linked to the Cu(II) via three N atoms. The CuN۶ entities have compressed octahedral geometry with the shortest Cu-N bonds that form the axial positions. This complex represents z-in distortion at ۲۹۳K and has a D۲d point group. The effective magnetic moment ( μeff ) of  [Cu(terpy)۲](PF۶ )۲  was measured to be ۱.۹۵BM by Evans method. Cyclic voltammetry experiment of the complex shows that the Cu(II/I) couple is quasi-reversible.

کلیدواژه ها:

Cu(II) complex ، Terpyridine ، Z-in distortion ، Crystal structure ، MLCT ، Evans method