Colourless phosphorescing green glowing luminophor

FIELD: chemistry.

SUBSTANCE: disclosed is a colourless phosphorescing luminophor, which is a coordination compound of terbium (III) with [2-(aminocarbonyl)phenoxy]acetic acid (HL2) and having formula Tb(L2)3, and specifically: , having high quantum efficiency of luminescence, considerable luminescence intensity and fluorescence maxima at 20500, 18300, 17000, 16000 cm-1.

EFFECT: possibility of use in protecting bond payer and documents from forgery, and as radiating substances in electroluminescent devices.

1 dwg, 1 ex

 

The invention relates to the phosphorescent phosphors, particularly to those which are colorless in daylight. Such phosphors are used in remedies securities and documents from fraud, as well as emitting substances in electroluminescent devices. (Katkov M.A., Vituhnovskaya A.G., M. N. Bochkarev. // USP. 2005. T. No. 12. S-1215.)

Known phosphorescent phosphors green fluorescence representing various coordination compounds of lanthanides with carboxylate ligands such as Tris-benzoate and Tris-nitrobenzoate of terbium. These coordination compounds have low quantum efficiency of luminescence. (V.Tsaryuk, .Zhuravlev, V.Zolin, P.Gawryszewska, J.Legendziewicz, V.Kudryashova, I.Pekareva. Regulation of excitation and luminescence efficiencies of europium and terbium benzoates and 8-oxyquinolinates by modification of ligands // Journal of Photochemistry and Photobiology A: Chemistry 177 (2006) 314-323).

Partially the drawbacks are eliminated by the coordination compound of terbium(III) ortodoxising acid (HL1), having the formula Tb(L1)3(orthoxylene of terbium(III)), which is colorless phosphorescent phosphor green fluorescence, which is selected as the closest analogue of the prototype. Compared with the above analogs it has a large quantum efficiency of luminescence, namely 5 times for Tris-benzoate terbium(III) and as for Tris-nitrobenzoate of terbium(III). (Eliseeva, S., O. Kotova, Kuzmina N. et al. // Synth. Met. 2004. V.141. P.225.)

The disadvantages are the closest analogue is low intensity and quantum efficiency of luminescence.

The technical objective of the claimed invention to provide a colorless effective phosphorescent phosphor green fluorescence with high intensity luminescence.

To solve this problem is proposed colorless phosphorescent phosphor, which represents a coordination compound of terbium(III) with [2-(aminocarbonyl)phenoxy] acetic acid (HL2) and having the formula Tb(L2)3namely:

Unlike the prototype of the proposed phosphor as a ligand contains [2-(aminocarbonyl)phenoxy]acetic acid (HL2), which provides coordination compound of terbium (III) General formula TbL3the novelty.

The drawing shows the luminescence spectra of the prototype (1) and declare (2) phosphor at room temperature, which represents the dependence of the luminescence intensity wave number.

As seen in the drawing, the inventive phosphor has a higher quantum efficiency of luminescence that is determined by the area under the curve of the spectrum of luminescence in the visible region compared to the prototype (7.7 times) and the greater the intensity of the luminescence, which is determined by the height of the peaks of the peaks in the luminescence spectra. The claimed substance has a maximum phosphorescence when 20500, 18300, 17000, 16000 cm-1.

The coordination compound of terbium(III) with [2-(aminocarbonyl)phenoxy]acetic acid was obtained by the electrochemical method of synthesis according to the method of the dissolved anode (NBD, Adherence, Oaasypow, Wppreview, Nemer. Complex compounds of metals with certain nitrogen-containing ligands, Zh. General chemistry). - 1976. - V.46. No. 3. - S.675).

An example of a specific implementation.

In the electrochemical cell was placed 50 ml of 0.05 M solution of [2-(aminocarbonyl)phenoxy]acetic acid (HL2) in methanol. As a background electrolyte add 0.5 g of lithium chloride. In the resulting solution was lower platinum electrode which is the cathode, and the electrode of the metal terbium, which is the anode and connected to a constant current source. Electrochemical synthesis are within 2 h 40 min, at a voltage of 10 V, a current of 25 mA and a current density of 10 mA/cm2. In the course of synthesis in the system, the following processes occur:

K/HL2+e→L2-+1/2H2;

A/Tb0-3rd→Tb3+;

3L2-+Tb3+→Tb(L2)3

As a result of synthesis of a white precipitate is formed which is then filtered off, washed with ethanol and dried to constant weight. The output of the compounds obtained SOS the start-UPS amounted to 85,3%.

The results of the analysis of the obtained compound: Found (%): C, at 43.68; H, 3.22; N, 5.61; Tb, 21.44. C27H24N3O12Tb. Calculated (%): C, 43.74; H, 3.26; N, 5.67; Tb, 21.52.

The IR spectrum of the claimed synthesized coordination compounds detected absorption bands (cm-1) 3412 ν(N-H), 1609 δ(N-H), 1596 νas(COO-), 1420 νs(COO-). In the ultraviolet region of the spectrum when 33500 cm-1the detected absorption band (the logarithm of the coefficient of extinction is equal to 3.51).

Based on the above it can be concluded that the inventive phosphor has a higher efficiency (7.7 times) and the intensity of green fluorescence luminescence in comparison with the prototype, and therefore involves an inventive step, industrial applicability, i.e. meets the criteria of the invention.

Colorless phosphorescent phosphor green fluorescence, which is a coordination compound of terbium (III) General formula TbL3, characterized in that the ligand used [2-(aminocarbonyl)phenoxy]acetic acid (HL2), and having the formula Tb(L2)3namely:
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