A microporous metal–organic open framework containing uncoordinated carbonyl groups as postsynthetic modification sites for cation exchange and Tb3+ sensing

Abstract

A novel 3D microporous compound [Zn3(Httca)2(4,4'-bpy)(H2O)2]n (MOF-COOH) containing uncoordinated carbonyl groups pointing to the pores was prepared. The uncoordinated carbonyl groups in the channels can act as postsynthetic modification sites for cation exchange. The MOF-COOH compound can effectively and selectively serve as an antenna for sensitizing the visible-emitting Tb(3+) cation.

The Quantitative Evaluations of the Luminescent Sensing Ability to Cu2+ Based on Two Homologous Crystalline Coordination Polymers

“…Obviously, the tested emission intensities of two CPs are much larger than that of H 4 ttac, and this phenomenon may be explained by AIE (aggregation‐induced emission), that is, the coordination of ligand to metal ions in CPs can restrict the deformation the ligand and reduce the non‐radiative transitions. In addition, the emissions of ligand, 1 and 2 are in good agreement with the previously reports for H 4 ttac ligand …”

“…Generally, LCPs used to detect metal ions are the electron‐rich frameworks with 2D/3D porous structures, nonporous frameworks with 2D sheets, or 3D structures with functional groups . Herein, the electron‐rich fluorophores phenyl in both structures, the protonated carboxylic groups in 1 , and the 2D sheet motif of 2 have stirred our great interests in exploring their applications as luminescent probes for sensing metal ions.…”

Zinc(II) and Cadmium(II) Complexes Based on 4,5‐Di(4′‐carboxylphenyl)phthalic Acid Ligand: Synthesis, Crystal Structure, and Luminescent Properties

“…It is obvious that the H 4 ttca ligand shows a strong emission at 394 nm with the excitation of 339 nm, which is attributed to the π*Ǟπ and/or π*Ǟn transitions. [16] Dramatically, the luminescence intensity of the complexes are weaker than the free H 4 ttca ligand, indicating ligand-to-metal charge transfer (LMCT) is inefficient, [5] as it is difficult for the transition met- [17] It may be the "heavy atom effect" (which can enhance molecular spin orbit coupling) that led to a decrease in fluorescence intensity. From the comparison of complex 1 and the other two complexes, it can be found that the luminescence of complex 1 has much higher red shifted, which may be assigned as the strong interaction between ligand and central metal atoms.…”

Two new Co(II)-MOFs based on polymeric chain building units: Crystal structures, and magnetic properties

“…As a derivative of 1,2,4,5-benzenetetracarboxylic acid, 1,1′:2′,1″-terphenyl-4,4′,4″,5-tetracarboxylic acid, a more flexible and bigger ligand, can adopt various coordination modes and allowing higher dimensionality structures. So it has been employed to construct CPs [34][35][36][37][38]. However, polymetallic clusters of 1,1′:2′,1″-terphenyl-3,3″,4′,5′-tetracarboxylic acid (H 4 L), an isomeric tetracarboxylic acid, with transition metal is rare until now [39].…”