Fluorescence Turn On of Coumarin Derivatives by Metal Cations:  A New Signaling Mechanism Based on C=N Isomerization

Abstract

[reaction: see text] A new sensing mechanism based on C=N isomerization, which shows a very significant fluorescence enhancement to the metal cations in a simple and efficient way, is demonstrated. A coumarin derivative (L) containing a C=N group was designed as an example for illustration. The free ligand L is almost nonfluorescent due to the isomerization of C=N double bond in the excited state. However, the solution of ligand shows about a 200-fold increase of fluorescence quantum yield (about 30%) upon addition of Zn(ClO4)2.

Fluorescent Magnesium(II) Coordination Polymeric Hydrogel

“…Together with the viscoelastic properties and biocompatibility, the Mg 2 + hydrogel may find utility as a novel soft material in biomedical applications. Keywords: coordination polymers · fluorescence · hydrogel · magnesium · viscoelasticity tween the metal cations and fluorophores, [13] main group metals do not quench the fluorescence. It has been reported that the fluorescence properties of coumarin derivatives can be retained in the presence of alkali-earth metals and quenched by transition metals.…”

AIE Based Coumarin Chromophore - Evaluation and Correlation Between Solvatochromism and Solvent Polarity Parameters

“…HCl and glacial acetic acid using the reported procedure [48] Compound 2 was subjected to Vilsmeier-Haack reaction using DMF/POCl 3 to give 7-(diethylamino)-2-oxo-2 H-chromene-3-carbaldehyde (3) according to the procedure has been described by Wu et al [48].…”

Crystal structure of 7-(diethylamino)-2-oxo-2H-chromene-3- carbaldehyde, C14H15NO3

“…Thet itle compound was synthesized according to published procedures [1][2][3][4]. All chemicals usedw ere commercially available of AR grade, and were used as received without further purification.…”