Two coordination polymers with enhanced ligand-centered luminescence and assembly imparted sensing ability for acetone

Abstract

Two luminescent coordination polymers were constructed with a fluorescent ligand. The emissions of these compounds could be effectively and selectively quenched by acetone, showing their potential as acetone sensors. The formation of a coordination polymer structure is proven to be responsible for their strong emission and sensing properties.

A Water‐Stable Luminescent ZnII Metal‐Organic Framework as Chemosensor for High‐Efficiency Detection of CrVI‐Anions (Cr2O72− and CrO42−) in Aqueous Solution

“…Thus, the resonance energy transfer from the MOF ( NUM‐5) to the analyte (Cr VI ) might take place and lead to the fluorescence quenching . Based on these pieces of evidence, we suggest that both competitive absorption and resonance energy transfer are responsible for the fluorescence quenching response of NUM‐5 to Cr VI anions (Figure ), as reported in other previous studies …”

“…Notably, as shown by Figure S15, the UV/Vis absorption bands of NUM‐5 and Cr VI anions (Cr 2 O 7 2− /CrO 4 2− ) strongly overlapped, far exceeding other tested anions. Thus, the Cr VI (Cr 2 O 7 2− /CrO 4 2− ) ions in aqueous solution compete and hinder the absorption of excitation energy, accounting for the selective fluorescence quenching response of NUM‐5 . Apart from this, it is evident that the broad absorption bands of Cr VI (Cr 2 O 7 2− /CrO 4 2− ) from 250 to 525 nm also cover a large part of the emission band of NUM‐5 (400–650 nm), while in the same wavelength range no overlap between the emission band of NUM‐5 and the absorption bands of other anions was observed (Figure S16).…”

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

“…Since LCPs 1 and 2 are built by the d 10 electron configuration Cd 2+ ion and fluorescent rigid H 4 ttac ligand, they are highly possible to show the excellent photoactivity, so the luminescent properties of two LCPs have been examined in detail. When excited at 320 nm in the solid state, the products of 1 and 2 display the highly blue luminescent emissions centred at 385 nm, and 392 nm (Figure S3, Supporting Information), respectively, which can be ascribed as π*→n or π*→π transition from the ligand with perturbation by Cd 2+ ions and other components, for their similar emission wavelengths and band shape . 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.…”

Zn(II) Complex for Highly Sensitive and Selective Detection of Acetone at Room Temperature

“…It clearly confirms that the Zn complex can effectively sense acetone even if the sample is contaminated with other solvents. Besides, we did not preactivate our system by heating, pH maintenance, or any other external factor, which is in contrast to lanthanides and few other coordination complexes that require preactivation [33][34][35] .…”