Two novel 3D Zn(II)/Cd(II) MOFs with tri- or di-nuclear cluster units for multifunctional sensing applications in aqueous media

Structures and luminescence properties of one co‐edge bi‐rhomboid [Zn6] based 1D stair‐stepping polymer and one quasi‐linear tetra‐nuclear [Cd4] cluster with orotic acid

“…When compared with the free H 3 OA, there are obvious red shifts in the emission spectrum of 1 and 2 . This may be due to the coordination effect of Zn(II)/Cd(II) ion with HOA 2− ligand and nephelauxetic effect [20,27] …”

“…This may be due to the coordination effect of Zn(II)/Cd(II) ion with HOA 2À ligand and nephelauxetic effect. [20,27]…”

“…The d 10 metal ions of Zn(II) and Cd(II) with closed‐shell electronic configuration were often used to prepare luminescent MOCCs which could display a variety of coordination numbers and avoid the attenuation or quenching of ligand‐based emissions which was usually observed in the paramagnetic 3d systems [15,19,20] . In addition, a proper selection of organic ligands is also very important to build such luminescent materials.…”

“…[14][15][16][17][18] The d 10 metal ions of Zn(II) and Cd(II) with closed-shell electronic configuration were often used to prepare luminescent MOCCs which could display a variety of coordination numbers and avoid the attenuation or quenching of ligand-based emissions which was usually observed in the paramagnetic 3d systems. [15,19,20] In addition, a proper selection of organic ligands is also very important to build such luminescent materials. Comparing with diversiform organic ligands, the N-containing heterocyclic carboxylate ligands are a remarkable candidates due to their versatile bridging modes as well as their preference to assemble into higher-dimensional supramolecular structures through hydrogen bonds and π•••π stacking for the rigid skeletons and recognition sites.…”