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151625-32-0

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151625-32-0 Usage

Uses

6,7-Dimethoxy-4-(trifluoromethyl)coumarin is a useful fluorescent labelling chemical.

Check Digit Verification of cas no

The CAS Registry Mumber 151625-32-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,1,6,2 and 5 respectively; the second part has 2 digits, 3 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 151625-32:
(8*1)+(7*5)+(6*1)+(5*6)+(4*2)+(3*5)+(2*3)+(1*2)=110
110 % 10 = 0
So 151625-32-0 is a valid CAS Registry Number.
InChI:InChI=1/C12H9F3O4/c1-17-9-3-6-7(12(13,14)15)4-11(16)19-8(6)5-10(9)18-2/h3-5H,1-2H3

151625-32-0SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 19, 2017

Revision Date: Aug 19, 2017

1.Identification

1.1 GHS Product identifier

Product name 6,7-dimethoxy-4-(trifluoromethyl)chromen-2-one

1.2 Other means of identification

Product number -
Other names -

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:151625-32-0 SDS

151625-32-0Downstream Products

151625-32-0Relevant articles and documents

Trifluorocoumarino Cryptands as Photoprotonic Molecules: Basic Features and Theoretical Considerations

Buet,Kastenholz,Grell,Kaeb,Haefner,Schneider

, p. 5871 - 5881 (2007/10/03)

The coupling between the fluorescence properties of the (trifluoromethyl)coumarino fluorophore and the protolytic state of the ion binding moiety of two fluorescent cryptands, F221 and F222, is investigated experimentally by carrying out steady-state and time-resolved fluorescence measurements. The high-intensity fluorescence emission of the diprotonated state of the these alkali ion-selective indicators, characterized by quantum yields of 0.6 and 0.83 as well as by lifetimes of 5.3 and 5.6 ns, are markedly quenched upon deprotonation, which leads to the monoprotonated state with quantum yields of 0.07 and 0.02 as well as lifetimes of 1.0 and 0.19 ns, respectively. The corresponding pKa1 values are 7.07 for F221 and 5.85 for F222. The formation of the fully deprotonated state of the fluorescent cryptands, characterized by pKa2 values of 10.6 and 9.3, respectively, is accompanied by a comparatively small additional reduction of the fluorescence quantum yield and lifetime. As a framework for the understanding of the pH-dependent fluorescence parameters, we suggest the concept of fluorescence quenching via photoinduced electron transfer (PeT), where the quenching process is assumed to be controlled by the pH-dependent availability of nonprotonated bridgehead N-atoms of the cryptand. These N-atoms act as electron donors with respect to the excited fluorophore, which functions as electron acceptor. In order to quantify the PeT energetics in the case of F221 and its monoprotonated state, one-electron oxidation and reduction potentials are determined by cyclic voltammetry for the parent cryptand [2.2.1] and the fluorophore derivative I as suitable model compounds, respectively. Experimental redox data are supplemented by simple estimations of the electrostatic energy contributions for the intramolecular radical ion pair produced through photoinduced charge separation and by corrections for the hydration energies. The resulting thermodynamic driving forces for PeT in the deprotonated F221 and its monoprotonated form show that PeT is favored for both of these species in water, where only a minor endergonic shift is observed for the monoprotonated as compared to the fully deprotonated compound. Therefore, the fully de- and the monoprotonated state of these fluorescent cryptands are regarded as being responsible for the reduction of the fluorescence quantum yield and the appearance of the second lifetime τ2 at high pH. In contrast, PeT is expected to be completely blocked for the diprotonated state of these (trifluoromethyl)coumarino cryptands.

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