X-ray Crystal Structure and Luminescence Properties of Pd(II) and Pt(II) Complexes with Dithiopyrrole

The complexes Pd(nbmtp)Cl₂and Pt(nbmtp)Cl₂(nbmptp = 1-nonyl-3,4-bis(methylthio)pyrrole) were prepared and their x-ray structures were determined at room temperature. The four-coordinated metal unit and the pyrrole ring formed a nearly planar geometry. The free ligand dissolved in CH₂Cl₂produced two luminescence bands associated with the lone-pair electron of S (λmax = 525 nm) and the pyrrole p electron (λmax = 388 nm). When the two complexes were dissolved in CH₂Cl₂, these two luminescence bands were also observed, although the low-energy band was blueshifted. For the crystalline Pt(II) complex, only the strong charge transfer band (λmax = 618 nm) from the d* orbital of Pt resulted from excitation of the lone-pair electron of S. KCI Citation Count: 4