Synthesis and Photophysical Properties of Emissive Silver(I) Halogenido Coordination Polymers Composed of {Ag2X2} Units Bridged by Pyrazine, Methylpyrazine, and Aminopyrazine

Luminescent silver(I) coordination polymers having a {Ag-2(mu-X)(2)} rhombic core (X = I, Br) were prepared using pyrazine (pyz), methylpyrazine (Mepyz), and aminopyrazine (ampyz) as bridging ligands. Photophysical measurements show that the complexes were strongly luminescent in the solid state at room temperature; further, the emissive excited state of the pyz and Mepyz complexes was a triplet charge-transfer ((CT)-C-3) excited state, similar to that of their copper(I) congeners, whereas that of the ampyz complex was a intraligand ((IL)-I-3) excited state. The energy of the (CT)-C-3 excited state of a silver halogenido complex was revealed to be ca. 5000 cm(-1) higher than that of the corresponding copper complex.

Automated summary

Silver(I) coordination polymers with luminescent properties were prepared using different bridging ligands, showing strong luminescence in the solid state at room temperature. The photophysical measurements revealed differences in the excited state properties of the complexes with different ligands. Additionally, the energy of the excited state of the silver halogenido complex was found to be significantly higher than that of the corresponding copper complex.