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Sensitivity of a solid Eu(Ⅲ) complex towards acetonitrile vapor:Structural and spectroscopic characterization

Journal of Rare Earths 2020年第5期38卷 571-576页

作者： Fabio Piccinelli Veronica Paterlini Magda Monari Marco Bettinelli Luminescent Materials Laboratory DBUniversita di Veronaand INSTMUdR VeronaStrada Le Grazie 1537134VeronaItaly Dipartimento di Chimica"G.Ciamician" Universita di BolognaVia Selmi 240126BolognaItaly

The Eu(Ⅲ)nitrate complex of the meso-N,N’-bis(2-pyridylmethylene)-1,2-(R,S)-cyclohexanediamine ligand was synthesized and characterized by single crystal and powder X-ray *** crystal lattice of the complex is capable of absorbing and desorbing selectively acetonitrile molecules,at 293 K upon an acetonitrile vapor pressure of^0.1×10^5 *** process,which is partially reversible,can be easily followed by both powder X-ray diffraction(P-XRD)and Eu(III)luminescence *** acetonitrile molecule,located in the outer coordination sphere of the metal ion,does not affect the radiative transition probability of 5 D0 level of Eu(Ⅲ)and also it does not activate further non-radiative channels from this *** the other hand,this molecule is capable of affecting the energy position and intensities of the crystal field components of the 5 D0→7 F2 *** complex in solid form can be considered a promising material for the optical sensing of acetonitrile vapors.

关键词： Eu(Ⅲ) X-ray diffraction Crystal structure luminescence spectroscopy Rare earths

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White Emitting ZnS Nanocrystals： Synthesis and Spectrum Characterization

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Chinese Physics Letters 2010年第5期27卷 237-240页

作者：黄青松董冬青徐建萍张晓松张宏敏李岚 Institute of Material Physics Tianjin Key Laboratory for Optoelectronic Materials and DevicesKey Laboratory of Display Materials and Photoelectric Devices of Ministry of Education Engineering Research Center of Communication Devices and Technology of Ministry of Education Tianjin University of TechnologyTianjin 300384

Spherical organic-bonded ZnS nanocrystals with 4.0 4-0.2 nm in diameter are synthesized by a liquid-solid-solution method. The photoluminescence spectrum of sample （[S^2-]/[Zn^2＋] = 1.0） shows a strong white emission with a peak at 490nm and - 170 nm full widths at half maximum. By Gauss fitting, the white emission is attributed to the overlap of a blue emission and a green-yellow emission, originating from electronic transitions from internal S^2- vacancies level to valence band and to the internal Zn^2＋ vacancy level, respectively. After sealingZnS nanocrystals onto InGaN chips, the device shows CIE coordinates of （0.29,0.30）, which indicates their potential applications for white light emitting diodes.

关键词： ZINC sulfide crystals NANOCRYSTALS INORGANIC compounds -- Synthesis SOLUTION (Chemistry) luminescence spectroscopy GAUSSIAN processes PHASE transformations (Physics) LIGHT emitting diodes

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Syntheses, characteristics, and fluorescence properties of complexes of europium with benzoic acid and its derivatives

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Rare Metals 2004年第4期23卷 306-310页

作者： ZHOUZhongcheng SHUWangen RUANJianming HUANGBoyun LIUYounian StareKeyLaboratotyforPowerMetallurgy CentralSouthUniversityChangsha410083China CollegeofChemistryandChemicalengineering CentralSouthUniversityChangsha410083China

The binary complexes of europium with benzoic acid and its derivatives(phthalic acid, m-phthalic acid, o-aminobenzoic acid, salicylic acid, and sulfosalicylic acid) weresynthesized and their compositions were identified by elemental analyses. UV and IR of the complexeshave been investigated. The UV spectra indicated that the complexes' ultraviolet absorption weremainly the ligands' absorption. The IR spectra showed that the IR spectra of complexes are differentfrom those of free ligands. The fluorescence properties of them were investigated by usingluminescence spectroscopy, the results showed that only three complexes appear as betterluminescence, they were Eu-benzoic acid, Eu-m-phthalic acid and Eu-phthalic acid, while the othersexhibited the ligands' wideband emission.

关键词： function materials rare earth complexes luminescence spectroscopy benzoicacid fluorescence properties

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Spectroscopic Sensing Characteristics of Novel Osmium Carbonyl Complexes to DNA and Other Polyanions

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American Journal of Analytical Chemistry 2021年第7期12卷 277-293页

作者： Gregory Ostner Cody Piotrowski Xinyao Ren Yu Lei Mehrun Uddin Stacey Wong Karen Chen Lan Pham Elise Megehee Enju Wang Department of Chemistry St. John’s University Jamaica USA

In this research, the absorbance and luminescence response of two osmium(II) phenathrane (phen) carbonyl complexes to various DNA, heparin and i-carrageenan polyanions were studied. The [Os(phen)2CO(L)]2+ complexes with L either a 4-phenyl pyridine (4-phpy) or phenyl imidazole (phimd) group exhibit moderate luminescent intensity in the visible region, their intensities are highly altered by the addition of DNA and other polyanion samples. These luminescent responses to polyanions were also compared with the [Ru(phen)3]2+ complex. In ethanol solution, the presence of polyanions significantly enhanced the luminescent emission intensity of [Os(phen)2CO(L)]2+ complexes with a blue shift. While the polyanions all showed emission enhancement on the highly lumi-nescent [Ru(phen)3]2+ complex in ethanol solution with a red spectra shift. The [Os(phen)2CO(L)] 2+ with (phimd) ligand has the lowest emission in ethanol solution, its intensity can be enhanced up to 11 times in the presence of DNA polyanions. This enhancement for all the complexes in ethanol is mainly due to their electrostatic interaction with the anion sites and with some degree of ligand intercalation into the polyanion hydrophobic structure which reduced the solvent quenching of the complexes. The blue shift of the (4-phpy) and particularly (phimd) Os(II)CO complexes indicate an insertion of the (4-phpy) or (phimd) group into the polymer chains. The two new Os(II)CO complexes has great potential to be used as luminescence sensors for DNA and polyanion detection in the low micro molar range with high sensitivity.

关键词： Os(II)CO Complex Absorbance luminescence spectroscopy DNA and Polyanion Sensing

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