Crystal Structures and Luminescence Properties of Pd(II) and Pt(II) Complexes with 2,5-Bis(thiophene)-1-nonyl-3,4-bis(methylthio)pyrrole

Complexes of Pd(btnbmtp)Cl2 and Pt(btnbmptp)Cl2 (btnbmtp = 2,5-bis(thiophen)-1-nonyl-3,4-bis(methylthio)-pyrrole) were prepared and their crystal structures were determined at room temperature. In the structures, the two thiophene moieties lie in cis form with an average dihedral angle of 55.26o to the pyrrole frame. The luminescence properties of the free ligand and the complexes were investigated in solution and solid states. The luminescence of the compounds were not favored by substituting thiophene moieties to the pyrrole frame, compared to the unsubstituted nbmptp (nbmptp = 1-nonyl-3,4-bis(methylthio)pyrrole). In particular, thiophene substitution quenched the emission from the complexes dissolved in CH2Cl2 and reduced the charge transfer transitions from S atoms of the thio moieties to Pt in crystalline state, which was very characteristic of Pt(nbmptp)Cl2. KCI Citation Count: 2