Synthesis and X-Ray Structure of Triethylenetetramine-palladium(II) Complex

Abstract

Abstract The triethylenetetraminepalladium(II) perchlorate and the potassium triethylenetetraminepalladium(II)tris-(hexafluorophosphate) were prepared; the X-ray structure analysis has been carried out for the latter compound. The crystal of [Pd(trien)](PF6)2·KPF6 is orthorhombic, with space group Pbca: a=21.645 (5), b=20.873 (5), c=9.541 (2) Å, and Z=8. The structure has been determined from X-ray diffractometer data and refined to R=0.091 (1166 reflections). The Pd atom has a planar coordination of 4N atoms disposed in a somewhat trapezoidal form. The complex cation has a pseudo symmetry plane which is perpendicular to the 4 N plane and bisects the H2N–Pd–NH2 angle. In the quadridentate triethylenetetramine ligand, each of the terminal H2N–CH2–CH2–NH– fragments forms a 5-membered chelate ring with the asymmetric envelope conformation, whereas the chelate ring formed by the middle –NH–CH2–CH2–NH– fragment has the symmetric envelope conformation. The electronic spectrum of [Pd(trien)]2+ is presented.