I will present twelve novel luminescent metal-organic frameworks, TCZ-001 – TCZ-005 and TCZ-M (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho). All of the twelve MOFs were assembled from a novel luminescent carbazole-based ligand, 2,7-bis(4-benzoic acid)-N-(4-benzoic acid)carbazole. TCZ-001, TCZ-003 and TCZ-004 show a remarkable response to the Ni²⁺ concentration in DMA, H₂O or EtOH. Some of Zn²⁺ ions were replaced by Ni²⁺ ions and the rate of the transmetalation depended on the concentration of Ni²⁺ ions. Also, changing part of the metal node would transform the colour of emitted light. Additionally, the colour of the luminescence displays a linear correlation with the Ni²⁺ concentration range from 0.005 M to 0.35 M (mol·L⁻¹). Besides selective sensing of Ni²⁺, TCZ-004 can also be utilized to detect Eu³⁺ ions in DMA solution. Thus, several potential sensory probe materials for Ni²⁺ and Eu³⁺ detection in DMA solution have been obtained. As to TCZ-M (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho), X-ray crystallography showed that all of them are isomorphous and possess a 3,6-connected three-dimensional (3D) framework with a point symbol of {4·6²}₂·{4²·6¹⁰·8³}. The photoluminescence measurement indicates that TCZ-Eu shows reddish-orange emission bands and TCZ-Sm shows both visible and near-infrared (NIR) emission bands. In addition, the isomorphous structure of TCZ-M (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho) provide the potential to fabricate multicolour luminescent materials.

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