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  • articleNo Access

    Tunable luminescence and white light emission of porphyrin-zinc coordination assemblies

    Bipodal ligand 5,15-bis(4-carboxyphenyl) porphyrin (H4DCPP) was designed and synthesized. By adjusting the molar ratio of H4DCPP, ancillary ligand 4,4-bipyridine (bpy) and zinc acetate salts, three novel coordination assemblies, namely, zero-dimensional dimeric [Zn2(H2DCPP)2 ·bpy] ·4H2O ·4DMF (Zn-D), two-dimensional polymeric {[Zn2(DCPP) ·bpy0.5 ·H2O ·DMF0.5] ·solvent}n (Zn-2D), and three-dimensional polymeric [Zn2(DCPP) ·bpy0.5]n (Zn-3D) were assembled. Due to the delicate integration of multiple chromophores in the coordination space combining bpy, DCPP and MLCT emissions together, photoluminescence (PL) of the three porphyrin-zinc coordination assemblies differ from each other and color tone is tunable from blue to orange with changes of the excitation wavelength. In particular, white light emission (WLE) can be observed by the excitation of 270 to 290 nm, representing the first examples of single component WLE compounds based on porphyrin ligands. Furthermore, temperature-dependent luminescence results in a linear IT relationship in Zn-2D and Zn-3D assemblies, applicable for long wavelength red-emitting thermometers.