Fluorescence of some metal chelate compounds of 8-quinolinol—I

Ohnesorge, William E.; Rogers, L. B.

doi:10.1016/s0371-1951(59)80283-6

Cited by 76 publications

(40 citation statements)

References 26 publications

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“…The relation between the emittance and the ligand-to-metal molar ratio of the complexes was the same here as with the aluminum complexes (8,9) -Le., the emittance decreases when the extent of chelation is increased. The variation of the wavelength of maximum emittance of the complexes appears to o,o'-D i h y d roxyazo follow the same trend in these systemsi.e., an increase in the extent of chelation produces a red shift.…”

Section: Discussionmentioning

confidence: 99%

Spectrofluorometric Study of the Complexation of Indium Ion with 2-Methly-8-quinolinol in Absolute Ethyl Alcohol.

Ohnesorge¹

1963

Anal. Chem.

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b Indium ions form monoligand and triligand complex !species with 2-methyl-8-quinolinol in absolute ethyl alcohol solution.;'he fluorescence emitted by the former shows maximum intensity at a shorter wavelength and is more intense than ihat of the higher complex. Evidence of the existence of the 2 to 1 complex is presented and its optical properiies are estimated.Addition of the firat ligand to the indium ion displaces two coordinated ethyl alcohol or water molecules, but each of the next two ligands displaces a coordinated ethyl alcohol or water molecule and a coordinated lyate or hydroxide ion. The acid decomposition of the 3 to 1 species is shown to result in the formation of the lower complexes.PEcmomuoRommIe data have S been shown to be an invaluable supplement to other optical and to potentiometric data for the study of complexation reactions in nonaqueous solvents. Studies of the complexation of aluminum with 8-quinolinol and with its 2-methyl derivative in absolute ethyl alcohol have established the existence of fluorescent polynuclear complexes having a ligand-to-metal molar ratio of 1. It was also shown that the ligand replaced a coordinated solvent or water molecule and a coorfiated lyate or hydroxide ion. The c.ata were used to estimate the value of the equilibrium constant for the formation reactions ( 7 , aThe same techniques have now been used to investigate the complexation of indium ion with 2-mc:thyl-8-quinolinol in absolute ethyl alcohol. Formation of not only a monoligand complex but also of others with ligand-to-metal molar ratios of 2 and 3 hail been observed. The efficiency of the fluorescence emitted by the lowest indium complex was considerably greater than that of the highest complex.The anomalous increase in the fluorescence intensity and the blue shift of the wavelength of maximum emission which were observed (1 9) upon the addition of acid to ethyl ,alcohol solutions of tris-(8quinolinolato)indium(IPI) are also observed with the chelate formed by the 2-methyl derivative of the ligand.It has been established that these changes in emittance are due to the formation of lower complexes in the decomposition, EXPERIMENTAL

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Section: Discussionmentioning

confidence: 99%

Spectrofluorometric Study of the Complexation of Indium Ion with 2-Methly-8-quinolinol in Absolute Ethyl Alcohol.

Ohnesorge¹

1963

Anal. Chem.

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“…8-hydroxyquinoline metal chelate complexes were used for many years in analytical chemistry for a gravimetric determination of various metal cations in solution [1]. The development of more convenient spectroscopic techniques has meanwhile replaced this method and concomitantly decreased the interest of researching chemists in this reagent.…”

Section: Introductionmentioning

confidence: 99%

Thermal, structural and photophysical properties of the organic semiconductor Alq3

Cölle

Brütting

2004

phys. stat. sol. (a)

137

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This review describes the thermal, structural and photophysical properties of different polycrystalline phases of the organic semiconductor Alq 3 . In particular the new blue luminescent -phase is shown to contain the facial isomer. The results obtained by using differential scanning calorimetry, X-ray diffraction, infrared spectroscopy, transient and delayed photoluminescence measurements clearly demonstrate the existence of this isomer. From the results presented it is now possible to obtain the pure facial isomer of Alq 3 in large quantities, providing the basis for further investigations to determine its effects on the performance of organic light-emitting diodes. Furthermore, recent results on the properties of the triplet states in Alq are presented. This includes the population of the electronic excited triplet state due to intersystem crossing and the spectrum of the phosphorescence.

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“…The most intense absorption between 266 and 283 nm (DCE) that appears in all compounds arises from the typical band of quinolinates 24. Moreover, the UV/Vis spectra show one absorption band between 320 and 355 nm (DCE) with extinction coefficients of 2000–3500 dm 3 mol –1 cm –1 assigned to the π–π* transition.…”

Section: Resultsmentioning

confidence: 99%

Crystal Structures and Spectroscopic and Theoretical Properties of Pentacoordinate Nickel(II) Complexes Containing Tris(pyrazolyl)borate and Quinolinate Ligands

et al. 2013

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A series of quinolinate nickel-tris(pyrazolyl)borate complexes [Ni(Tp*)(N,O-2,5,7-R 1 ,R 2 ,R 3 -8-hq)] {Tp* = hydrotris-(3,5-dimethylpyrazolyl)borate, 8-hq = 8-hydroxyquinoline} were synthesized and characterized by spectroscopic methods. Single-crystal X-ray studies indicate that these complexes exhibit a pentacoordinate arrangement with chelating quinolinate and hydrotris(3,5-dimethylpyrazolyl)borate ligands. The substituents on the quinolinate generate variations in the absorption and emission wavelengths. Substituents in the 5,7-positions and a 2-CN substituent in the quinolinate induce a bathochromic shift with respect to the unsubstituted derivative; however, 2-Me and 2-NH 2 substituents cause a blueshift. The UV/Vis spectra were investigated by time-dependent (TD)-DFT on the basis of the optimized [a]

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Fluorescence of some metal chelate compounds of 8-quinolinol—I

Cited by 76 publications

References 26 publications

Spectrofluorometric Study of the Complexation of Indium Ion with 2-Methly-8-quinolinol in Absolute Ethyl Alcohol.

Spectrofluorometric Study of the Complexation of Indium Ion with 2-Methly-8-quinolinol in Absolute Ethyl Alcohol.

Thermal, structural and photophysical properties of the organic semiconductor Alq3

Crystal Structures and Spectroscopic and Theoretical Properties of Pentacoordinate Nickel(II) Complexes Containing Tris(pyrazolyl)borate and Quinolinate Ligands

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