A Zn^II-Based Metal–Organic Framework with a Rare tcj Topology as a Turn-On Fluorescent Sensor for Acetylacetone

Abstract

A Zn II -based metal−organic framework (MOF) with a rare tcj topology has been solvothermally synthesized and displays relatively good thermal and chemical stabilities. Interestingly, the MOF can sensitively and selectively sense acetylacetone (acac) via a fluorescence enhancement effect with a detection limit of 0.10 ppm and good reusability, which demonstrates the first example of a MOF-based turn-on fluorescent sensor for acac.

A CdII‐Based Metal‐Organic Framework with pcu Topology as Turn‐On Fluorescent Sensor for Al3+

“…The solvothermal synthesis of Cd(NO 3 ) 2 ⋅4 H 2 O with corresponding ligands in 1:1 (for bbib and H 2 ndc) ratios produce colorless crystals. In view of the advantages of bis(benzimidazole) ligands with excellent coordination abilities, and H 2 ndc with diversiform coordination modes and large conjugated π electron system, they are propitious to construct MOFs with glamorous structures and properties . Therefore, the mixed‐ligand synthetic strategy is used to design the targeted MOF ( JXUST‐1) .…”

“…The solid luminescence properties of bbib, H 2 ndc and JXUST‐1 were investigated. The emission band of bbib is around 328 nm ( λ ex =280 nm) at room temperature according to the reported literature . Strong emissions of H 2 ndc and JXUST‐1 were observed at about 485 nm and 404 nm upon excitation at 375 nm and 354 nm, respectively (Figure ).…”

“…Strong emissions of H 2 ndc and JXUST‐1 were observed at about 485 nm and 404 nm upon excitation at 375 nm and 354 nm, respectively (Figure ). To our knowledge, the emission of organic ligand constituted from σ and π bonds is usually ascribed to π*→n and/or π*→π electronic transitions . The emission of JXUST‐1 may be due to the metal‐perturbed intraligand charge transferring owing to the d 10 electron configuration of Cd II .…”

CdII‐Organic Frameworks Fabricated with a N‐Rich Ligand and Flexible Dicarboxylates: Structural Diversity and Multi‐Responsive Luminescent Sensing for Toxic Anions and Ethylenediamine

“…[15] Earlier studies indicate that the excited electrons are transmittedf rom ah igh-lying p*-type lowest unoccupied molecular orbital (LUMO) to the conduction band (CB) of coordinationp olymer,f luorescencee nhancement effect will emerge. [32][33][34] In addition, 1 displays an emission peak red shift after adding of ethylenediamine ( Figure S13), which may be the strong exciplex formation between 1 and ethylenediamine. [34] The exciplexes are treated as excited complexes, which generally resulted from the interaction between an excited molecule and an unexcited molecule.…”

Effect of the Spacer Chain Length of Organic Dicarboxylic Acid on the Supramolecular Assembly of Two Ternary Zinc (II) Coordination Polymers Derived from Mixed Ligands

“…Though tremendous progress has been made in the design and fabrication of CPs, it is still a challenge to synthesize various architectures with desired topologies and properties. The self‐assembly process of CPs is influenced by many factors, such as central metal atoms, solvents, pH, temperature, and organic ligands . Among these parameters, the selection of suitable metal ions with appropriate geometry and the bridging ligands is crucial for the rational design of functional CPs with high photocatalytic activities , …”