New Cyanido-Bridged Complexes of Zn(II) and/or Ag(I) with TPymT and Tptz Ligands: Synthesis, Structural and Fluorescent Properties

Abstract

The use of two triazine-derived pincer ligands led to the obtaining of a heterometallic compound and of an unexpected 3D coordination polymer (CP). Therefore, by reacting 2,4,6-tri(2-pyridyl)-1,3,5-triazine (tptz) with Zn(NO3)2 and K[Ag(CN)2], the cyanido-bridged [Ag(CN)(m-CN)]2[Zn(tptz)(H2O)] (1) trinuclear complex was formed. Compound 1 crystallizes in the orthorhombic polar space group Aea2 and the crystal packing involves argentophilic interactions. When 2,4,6-Tris(2-pyrimidyl)-1,3,5-triazine (TPymT) was used as a ligand, along with the same precursors as for 1, a 3D CP was assembled, [Ag6(CN)6(TPymT)2] (2). The formation of 2 was favored, most likely, by the dicyanoargentate(I) ion dissociation and its interesting topology is due to the bridging cyanide ligands and argentophilic interactions. The fluorescence of both compounds was studied and compared to the emission features of their ligands. For the two coordination compounds, ligand-centered fluorescence data are discussed.