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1
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Structure and Spectroscopy of Selected Lanthanide Compounds with Coordination Number from 9 to 6

100%
Legendziewicz J.
Acta Physica Polonica A
|
1996
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vol. 90
|
issue 1
127-142
EN
The lecture deals with a group of lanthanide compounds in which some structural factors influence, in a special way, spectroscopic properties of the systems under investigation. The following systems were chosen: three with polymeric structure, two of the dimer type, one a pseudo-dimer system with coordination number (C.N.) = 7, and an octahedral compound of LnL_{6} type. The crystal structures of the systems under consideration will be shown, their absorption and excitation spectra will be presented and confronted with X-ray data. Radiative and nonradiative processes will be considered and the role of cooperative interactions analyzed. Some aspects of dynamics in solids will be done, too.
2
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Spectroscopic Properties of [Nd(C_{3}H_{7}NO)(NO_{3})_{3}(H_{2}O)_{3}]·H_{2}O Single Crystal with Tenfold Oxygen Coordination Nd^{3+} Centre

64%
Oczko G., Legendziewicz J.
Acta Physica Polonica A
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1993
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vol. 84
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issue 5
925-930
EN
The absorption spectra of [Nd(C_{3}H_{7}NO)(NO_{3})_{3}(H_{2}O)_{3}]·H_{2}O were measured at 293 K and 5 K and the intensities of f-f transitions were investigated. The electron-phonon features observed in absorption spectra were identified and compared with other available data for Nd systems.
3
Content available remote

Spectroscopic Properties of Neodymium Perchlorates in 2-Halogeno Derivatives of Ethanol. Part II

64%
Keller B., Legendziewicz J.
Acta Physica Polonica A
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1993
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vol. 84
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issue 5
903-907
EN
The spectroscopic studies of anhydrous neodymium perchlorate in two series of 2-halogeno derivatives of ethyl alcohol are presented. The changes of intensities of ^{4}I_{9/2} → ^{2}G_{7/2}, ^{4}G_{5/2} hypersensitive transitions are discussed within the framework of Mason's polarizability mechanism. Anomalous dependence of band intensities was found for the 2-fluoro derivatives. The linear relation of oscillator strength vs. solvent polarizability was broken for the 2-bromine and 2-iodine derivatives of ethyl alcohol. The effort was made for explanation of such strange results.
4
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Preparation and Spectroscopy of Lanthanide Single Crystals with Isoleucine

51%
Legendziewicz J., Ciunik Z., Gawryszewska P., Sokolnicki J.
Acta Physica Polonica A
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1993
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vol. 84
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issue 5
917-923
EN
Single crystals of lanthanide complexes (Ln = Pr, Nd, Eu) were obtained from aqueous solutions. Optical properties of the title compound are investigated by absorption, excitation, and emission spectra. Probabilities of electronic transitions were analysed and participation of vibronic components in the spectra were found. Temperature effect on the spectra was studied and analysed in terms of cooperative interaction.
5
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Optical Spectra of Neodymium and Europium Tungstates and Molybdates

51%
Macalik L., Hanuza J., Legendziewicz J.
Acta Physica Polonica A
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1993
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vol. 84
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issue 5
909-916
EN
Absorption and excitation spectra of lanthanides molybdates and tungstates were measured and analyzed. Probabilities of electronic transitions were analysed on the basis of the Judd-Ofelt theory. The significant differences of intensities were observed. Those differences could result from the symmetry changes, cooperative effects and electron-phonon interaction. The elucidation of intensities given by separate mechanisms needs further investigation.
6
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Optical Properties of Europium Compounds with L- and DL-α-Alanine-Hydroxamic Acids

51%
Legendziewicz J., Gawryszewska P., Gałdecka E., Gałdecki Z.
|
EN
Two of europium complexes with L- and DL-α-alanine-hydroxamic acids were synthesized. To our knowledge they are the first examples of X-ray and spectral data of lanthanide single crystals with hydroxamic acid derivatives. Both compounds consist of dimers in their structures, formed by two OH bridging groups of amino-hydroxamic acid molecules. Besides, two metal ions are chelated by CO and OH groups, forming five-membered rings. In the complex with L-ligand, different than in the DL-one, two additional perchloric acid molecules are included in crystal cavities and form hydrogen bondings with nitrogen and oxygen atoms of the ligand. Absorption, emission and excitation spectra were measured and analyzed at room and low temperatures. Structural effect of ligand chirality was found and its spectroscopic consequences are reported. The effect of the dimeric structure on spectroscopic properties is discussed.
7
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Optical Properties of Lanthanide Squarates

51%
Huskowska E., Legendziewicz J., Drożdżewski P.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
447-453
EN
Two types of lanthanide squarate hydrates of formulae Eu(C_{4}O_{4})(HC_{4}O_{4})(H_{2}O)_{6}·H_{2}O (compound I) and [Ln_{2}(C_{4}O_{4})_{3}(H_{2}O)_{8}] where Ln = Eu and Gd (compound II) were investigated. The optical properties of crystals I and selected spectral data of compound II are reported and confronted with earlier studies of europium complexes type II. Excitation and emission spectra were measured at 77 K. Effect of polymeric structure on spectroscopic properties is considered and correlated with the structural data. Cooperative intrachain interactions between metal ions coupled via squarate anions were pointed and cooperative absorption was recorded. To check the presence of the Eu^{2+} traces, the EPR and γ-irradiation measurements were applied. Raman spectra of the compound II (where Ln = from Sm to Lu) were measured in the range 50-500 cm^{-1}. Positions of the bands were considered in function of ionic radius of lanthanide ion. The above, together with the data from excitation spectra, allows to localize the Ln-O bands. Vibronic components in electronic spectra were elucidated and assigned.
8
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Vibronic Transitions in Centrosymmetric [Eu_{x}La_{1-x}(AP)_{6}](ClO_{4})_{3} Crystals

45%
Stręk W., Legendziewicz J., Huskowska E., Lukowiak E., Hanuza J.
Acta Physica Polonica A
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1993
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vol. 84
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issue 5
979-984
EN
The optical excitation and emission spectra of Eu(III) in [Eu_{x}La_{1-x}(AP)_{6}](ClO_{4})_{3} centrosymmetric complex were measured. The vibronic transitions were observed in excitation and emission spectra. Following the vibrational analysis' of the infrared and Raman spectra of [Pr_{x}La_{1-x}(AP)_{6}](ClO_{4})_{3}, the assignment of [Eu_{x}La_{1-x}(AP)_{6}](ClO_{4})_{3} vibronics was given The concentration effect on excitation and emission spectra was investigated. It was found that the vibronic intensities were changed upon the concentration effect. The intensive charge transfer bands were observed in blue region. Their intensities decreased with increasing concentration.
9
Content available remote

Luminescence and Lifetimes of Pr^{3+} Excited States in KLa_{1-x}Pr_{x}(MoO_{4})_{2} and KLa_{1-x}Pr_{x}(WO_{4})_{2} Crystals

45%
Macalik L., Ryba-Romanowski W., Gołąb S., Hanuza J., Legendziewicz J.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
301-306
EN
Single crystals of double molybdates and tungstates of the formula KLa_{1-x}Pr_{x}(MO_{4})_{2} (M = Mo, W) with a concentration of Pr^{3+} ions ranging from x=0.1 to x=0.005 have been prepared. Their electronic absorption and emission spectra have been measured and discussed as well as related to their crystal structures. Both the multiphonon relaxation and cross relaxation contribute to the decay of the ^{3}P_{0} level of Pr^{3+} in these two matrices.
10
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Stereoselectivity Effect on Tb(III)-Eu(III) Energy Transfer in Complexes with Glutamic Acid and Alanine

45%
Legendziewicz J., Huskowska E., Stręk W., Łukowiak E., Sztucki J.
Acta Physica Polonica A
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1993
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vol. 84
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issue 5
1021-1024
EN
The effect of stereoselectivity on energy transfer between Tb(III) and Eu(III) in crystals with glutamic acid and alanine was investigated. It was found that the stereoselectivity significantly changes the energy transfer in these systems. The theoretical model for the selective dependent energy transfer processes in lanthanide systems is developed and the nature of processes occurring in both systems under investigation briefly discussed.
11
Content available remote

Spectroscopic Studies of PrBr_{3}·7H_{2}O Monocrystal

45%
Oczko G., Legendziewicz J., Hanuza J., Gliński J., Macalik L.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
431-438
EN
Single crystals of praseodymium tribromide heptahydrate were grown from aqueous solution. The IR, Raman, and high resolution absorption spectra were measured at room and low temperatures. The assignments of IR and Raman frequencies are reported. The temperature dependence of intensities was found and vibronic coupling in f-f transitions was analysed. Anisotropy of the intensities of optical lines was detected and taken into account in the Judd-Ofelt analysis of the f-f transitions probabilities. The results are compared to the available IR and electron spectroscopic data for other single crystals of lanthanide bromides.
12
Content available remote

Optical Properties and Structure of Ln(NCS)(Hmpa)_{4}-(SCN)_{2}- HgCl(SCN)

45%
Gałdecka E., Gałdecki Z., Amirkhanov V., Kern K., Legendziewicz J.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
469-476
EN
Praseodymium, neodymium and europium complexes of the formula Ln(NCS)(Hmpa)_{4}-(SCN)_{2}-HgCl(SCN) were synthesised from non-aqueous solutions. The structure of neodymium complexes was determined by X-ray diffraction. The crystals of the title compounds crystallise in the space group Cc, where lanthanide ions are coordinated to seven ligand groups: four of Hmpa molecules and three SCN¯ ions. The compounds were characterised by IR, luminescence, excitation and absorption spectra at 6, 77, and 298 K. Probabilities of electronic transitions for Pr^{3+} ion were examined at 6 K and at room temperatures. Vibronic components were observed and analysed on the basis of IR and Raman data. Asymmetric arrangement of Ln ions was found from X-ray analysis and its influence on optical properties of active centre was discussed.
13
Content available remote

Comparison of Optical Properties of Eu^{3+} Ions in the Silica Gel Glasses Obtained by Different Preparation Techniques

45%
Legendziewicz J., Stręk W., Sokolnicki J., Keller B., Borzechowska M.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
461-468
EN
Silica sol-gel glasses doped with Eu^{3+} ions were obtained by different preparation techniques. The absorption, emission and excitation spectra of the obtained glasses were measured in the range of 77-300 K. The energy level diagrams of Eu^{3+} ions were derived. An intensity analysis of f-f transitions was performed. In particular, polymeric structure behaviour of europium compounds entrapped in silica gels glasses was temperature controlled during the preparation of glasses. Their optical properties were investigated.
14
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Content available

Investigation of Sol-Gel Glasses Doped with Lanthanide Ions by Spectroscopic, Acoustic, and Positron Annihilation Methods

39%
Jerie K., Baranowski A., Legendziewicz J., Guzik M., Burakowski A., Gliński J.
Acta Physica Polonica A
|
2006
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vol. 110
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issue 5
583-591
EN
The results of optical spectroscopic (UV-Vis, absorption, and emission), acoustic (sound velocity of precursor solutions, the solvation numbers of ions in these solutions), and positron annihilation of glasses are presented and discussed for silica glasses obtained by the alcoholic sol-gel technique, doped with selected lanthanides and with some addition of ethylene glycol. The aim of these investigations was the determination of the local structure of glass close to lanthanide ions and its influence on the optical properties of the material. The results show that the existence of alcohol-glycol solvates in glasses decrease the number of empty voids in its structure as well as the size of the remaining ones. One can suppose that this is caused by cooperative interactions of glycol molecules with the network of hydrogen bonds of the glass.
15
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Spectroscopic Studies of Neodymium and Europium Phosphoro-azo β-Diketonates

39%
Amirkhanov V., Ovchinnikov V., Legendziewicz J., Graczyk A., Hanuza J., Macalik L.
Acta Physica Polonica A
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1996
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vol. 90
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issue 2
455-460
EN
New complexes of lanthanides (Nd, Eu) with phosphoro-azo derivatives of β-diketones were synthesized. Optical properties of these compounds were investigated and confronted with the structure and single crystal spectra of different types of earlier reported lanthanide phosphoro-azo-β-diketonates. The exchange of the N-P-O-Me ligand group by the N-P-NR_{2} one plays only a minor role in binding character of lanthanide ions but strongly affects biological functions and properties of lanthanide systems. In vitro experiment on cytotoxicity of the samples was performed using 10T_{1/2}, L_{1}, MCF, DETA and Meω-132 cell lines.
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