Photoluminescence of bis(8-hydroxyquinoline) zinc (Znq2) and magnesium (Mgq2)

Tsuboi, Taijū; Nakai, Yosuke; Torii, Yasuko

doi:10.2478/s11534-011-0090-8

Cited by 23 publications

(18 citation statements)

References 18 publications

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“…Furthermore, the theoretical value of the HOMO–LUMO gap of 1 determined by DFT/TD‐DFT (3.19 eV) is close to the experimental value (3.06 eV), and it is in the range of those of [Zn(BTZ) 2 ] 2 [6b] and [Znq 2 ] 4 ,[8d], well‐established compounds in OLED fabrication (Table and Figure ).…”

Section: Resultssupporting

confidence: 74%

“…The electrochemical and photophysical data for 1 are tabulated in Table , together with experimental data for [Zn(BTZ) 2 ] 2 [6a], [6b], [6d] and [Znq 2 ] 4 ,[8d], molecular luminescent materials which have been successfully used in OLEDs. Cyclic voltammetry measurements for 1 in DCM show two irreversible ligand‐based oxidation events at 0.97 V and 1.16 V vs. SCE.…”

Section: Resultsmentioning

confidence: 99%

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A Zinc(II) Benzamidinate N‐Oxide Complex as an Aggregation‐Induced Emission Material: toward Solution‐Processable White Organic Light‐Emitting Devices

et al. 2018

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The synthesis, characterization, photophysical and redox properties of a dinuclear complex Zn 2 (AMOX) 4 (AMOX = 4-bromo-N,N′-diphenylbenzamidinate N-oxide) are highlighted. This compound is a first example of a novel class of aggregation-induced emission (AIE) materials. Noticeably, solution-processed white-green organic light-emitting diodes were fabricated using this complex as dopant in a co-host matrix in the [a] 4324 gands. This distinction indicates that the energy of the LUMO can be fine-tuned by modifying the C-aryl substituents with EW/ED groups. The TD-DFT calculations for 1 ( Figure S10, Table Eur.

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

A Zinc(II) Benzamidinate N‐Oxide Complex as an Aggregation‐Induced Emission Material: toward Solution‐Processable White Organic Light‐Emitting Devices

et al. 2018

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“…As a result, a fluorescent species under study can be identified by its emission spectrum and emission lifetime ( τ f ), and these can be used for discrimination of the autofluorescence background . Further, τ f can report on the microenvironment surrounding the fluorescent species and its kinetics, including fluctuations in viscosity or pH, binding to additional complex molecules, or depletion of the excited state due to the proximity of neighboring particles . We found that Zn(PT) 2 exhibits photoluminescence (PL) features, which can be used to improve its imaging contrast.…”

Section: Introductionmentioning

confidence: 99%

Optical Characterization of Zinc Pyrithione

Sandiford

Holmes

Mangion

et al. 2019

Photochem & Photobiology

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Zinc pyrithione is ubiquitous in commercial products particularly antidandruff shampoos. For the efficacy of zinc pyrithione therapeutic cleansers to be assessed accurately, the distribution of particles on the scalp needs to be visualized. Currently, no technique is available which provides the chemical specificity and sensitivity required. Here, we report application of fluorescence‐lifetime imaging microscopy (FLIM) for high‐contrast mapping of zinc pyrithione distribution on the scalp. Characterization of the zinc pyrithione emission by using both one‐photon excitation at five specific wavelengths and two‐photon excitation in the range of 740–820 nm revealed its FLIM fingerprint—a characteristic short average time‐weighted emission lifetime of ΤZnPT = 250 ps. Bandpass‐filtering FLIM signals at ΤZnPT enabled an efficient discrimination between the zinc pyrithione and major endogenous skin species in comparison with that of the conventional reflectance confocal microscopy. Our findings provide means for in vivo high‐sensitivity assaying and high‐contrast imaging of zinc pyrithione in biological systems.

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“…8‐Hydroxyquinoline bivalent metal complex (MQ 2 ) is an attractive kind of luminescent material, which has broad application prospects . MQ 2 (for example, 8‐hydroxyquinoline Barium, 8‐hydroxyquinoline magnesium, 8‐hydroxyquinoline calcium, and 8‐hydroxyquinoline zinc) has many advantages, such as simple synthesis conditions, high luminous efficiency, and high thermal stability . Many scholars have done in‐depth research focused on extending application potential of MQ 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Another disadvantage of liquid‐phase method is low yield . The disadvantage is that MQ 2 can only be excited under ultraviolet light by liquid‐phase method . This spends a massive amount of energy and severely limits the scope of application of MQ 2 .…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of 8‐Hydroxyquinoline Barium as Visible‐Light‐Excited Luminescent Material Using Mechanochemical Activation Method

Liu

Xue-ming

et al. 2019

Global Challenges

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stability. [17] Many scholars have done indepth research [18,19] focused on extending application potential [20,21] of MQ 2 . At present, liquid-phase method [22,23] is the main method to synthesize MQ 2 . Most of liquidphase methods used organic solvents that pollute the environment and harm the human body, such as methanol, [24] acetone, [25] ether, [26] and acetic acid. [27] Another disadvantage of liquid-phase method is low yield. [28] The disadvantage is that MQ 2 can only be excited under ultraviolet light by liquid-phase method. [4][5][6][7][8][9][10][11] This spends a massive amount of energy and severely limits the scope of application of MQ 2 . Compared with ultraviolet light, visible light have the advantages of lower biotoxicity, easier operating, and easier obtaining. Therefore, to excite MQ 2 by visible light and to ensure that it keeps high luminous efficiency is the focus and difficulty of current research on this product. However, the existing synthesis methods have not been able to synthesize MQ 2 , which can photoluminescent by visible light. This study presents a new synthesize method to overcome this problem-that is, the mechanochemical activation method.The mechanochemical activation method is compared with the traditional liquid-phase method. First, there is no need to use organic solvents in the mechanochemical activation method and it is environmentally friendly. Second, because there is no chemical equilibrium, the yield of the mechanochemical activation method is much higher than that of the traditional liquidphase method. Third, smaller size BaQ 2 can be synthesized by mechanization activation method. The mechanochemical activation method is compared with the traditional solid-phase method. First, the mechanochemical activation method makes the reactants contact in the molecular level and it increases the contact area between the reactants. Second the mechanochemical activation method reduces the heat energy of the solid-phase reaction, so that it can react under the condition of low heat.This study demonstrates that the mechanochemical activation method can synthesize the BaQ 2 that has a yield of 99.6% and can photoluminescent under 408 nm visible light. Findings from this study provide a new perspective on synthesis of the visible-light-excited luminescent material MQ 2 and enhance the prospects in the field of luminescent materials. Using high-energy UV-light to excite 8-hydroxyquinoline barium (BaQ 2 )is a short slab for this emerging area of organic luminescent materials. However, using visible light to excite BaQ 2 has not been reported. To solve this problem, this study proposes the mechanochemical activation method to synthesize luminescent material of visible-light-excited BaQ 2 . This research applies infrared spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, and fluorescence spectrometry to analyze the structure and luminescence properties. XRD shows that BaQ 2 has a high crystallinity, sma...

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Photoluminescence of bis(8-hydroxyquinoline) zinc (Znq2) and magnesium (Mgq2)

Cited by 23 publications

References 18 publications

A Zinc(II) Benzamidinate N‐Oxide Complex as an Aggregation‐Induced Emission Material: toward Solution‐Processable White Organic Light‐Emitting Devices

A Zinc(II) Benzamidinate N‐Oxide Complex as an Aggregation‐Induced Emission Material: toward Solution‐Processable White Organic Light‐Emitting Devices

Optical Characterization of Zinc Pyrithione

Green Synthesis of 8‐Hydroxyquinoline Barium as Visible‐Light‐Excited Luminescent Material Using Mechanochemical Activation Method

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