scholarly journals [Pt(SCN)4 ]2- -Based Coordination Polymers and Supramolecular Squares: Intermolecular Pt···H-C Interactions Probed by Luminescence Spectroscopy at Variable Pressure

2017 ◽  
Vol 2017 (22) ◽  
pp. 2864-2864 ◽  
Author(s):  
Yan Suffren ◽  
Masayuki Kobayashi ◽  
Jeffrey S. Ovens ◽  
Alexandre Rodrigue-Witchel ◽  
Caroline Genre ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Variable Pressure ◽  
Luminescence Spectroscopy

[Pt(SCN)4]2--Based Coordination Polymers and Supramolecular Squares: Intermolecular Pt···H-C Interactions Probed by Luminescence Spectroscopy at Variable Pressure

2017 ◽  
Vol 2017 (22) ◽  
pp. 2865-2875 ◽  
Author(s):  
Yan Suffren ◽  
Masayuki Kobayashi ◽  
Jeffrey S. Ovens ◽  
Alexandre Rodrigue-Witchel ◽  
Caroline Genre ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Variable Pressure ◽  
Luminescence Spectroscopy

Interaction of Thioether Groups at the Open Coordination Sites of Palladium(II) and Platinum(II) Complexes Probed by Luminescence Spectroscopy at Variable Pressure

2010 ◽  
Vol 49 (11) ◽  
pp. 4901-4908 ◽  
Author(s):  
Esther Pierce ◽  
Etienne Lanthier ◽  
Caroline Genre ◽  
Yurii Chumakov ◽  
Dominique Luneau ◽  
...  
Keyword(s):  
Variable Pressure ◽  
Luminescence Spectroscopy ◽  
Coordination Sites

Controlling dimensionality via a dual ligand strategy in Ln-thiophene-2,5-dicarboxylic acid-terpyridine coordination polymers

2015 ◽  
Vol 44 (36) ◽  
pp. 15843-15854 ◽  
Author(s):  
Korey P. Carter ◽  
Cecília H. F. Zulato ◽  
Emille M. Rodrigues ◽  
Simon J. A. Pope ◽  
Fernando A. Sigoli ◽  
...  
Keyword(s):  
Single Crystal ◽  
Dicarboxylic Acid ◽  
Coordination Polymers ◽  
Luminescence Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray

Eleven new lanthanide-2,5-TDC-terpyridine coordination polymers which employ a dual ligand strategy have been synthesized and characterized by single crystal and powder X-ray diffraction as well as luminescence spectroscopy.

Temperature- and pressure-dependent luminescence spectroscopy on the trans-[ReO2(pyridine)4]+ complex — Analysis of vibronic structure, luminescence energies, and bonding characteristics

2004 ◽  
Vol 82 (6) ◽  
pp. 1083-1091 ◽  
Author(s):  
John K Grey ◽  
Ian S Butler ◽  
Christian Reber
Keyword(s):  
Molecular Structure ◽  
Low Temperature ◽  
Room Temperature ◽  
Complex Analysis ◽  
Variable Pressure ◽  
Luminescence Spectroscopy ◽  
Luminescence Spectra ◽  
Vibronic Structure ◽  
Temperature Spectra ◽  
Temperature And Pressure

Resolved vibronic structure in electronic spectra provides a detailed view into how molecular structure changes after absorption or emission of a photon. We report temperature- and pressure-dependent luminescence spectra of trans-[ReO2(pyridine)4]I. Low-temperature spectra reveal long vibronic progressions in the totally symmetric O=Re=O (907 cm–1) and Re-pyridine (211 cm–1) stretching modes, indicating large structural displacements along these normal coordinates. The luminescence band maximum is at ca. 15 500 cm–1. Room-temperature spectra are somewhat less-resolved; however, intervals closely matching the O=Re=O frequency (~870 cm–1) persist at higher temperatures. The variable pressure spectra exhibit distinct changes in the vibronic patterns, and luminescence energies decrease by 16 ± 2 cm–1/kbar (1 bar = 100 kPa). Low-temperature spectra are modeled using two-dimensional potential energy surfaces to represent the initial and final electronic states, from which the quantitative normal coordinate offsets can be determined. We then adapt this model to the room-temperature, pressure-dependent data where it is possible to determine how the offsets and other important spectroscopic parameters vary with the pressure-induced changes of the molecular structure. Key words: trans-[ReO2(pyridine)4]I, low-temperature luminescence spectroscopy, high-pressure luminescence spectroscopy, vibronic structure, emitting state distortions.

Synthesis, Characterization and Luminescent Properties of New Coordination Polymers Based on p-tert-Butylcalix[4]Arene-Tetracarboxylic Acid and Lanthanide Cations

2012 ◽  
Vol 77 ◽  
pp. 132-137 ◽  
Author(s):  
Bráulio Silva Barros ◽  
Carlos Alberto Fernandes de Oliveira ◽  
Joanna Kulesza ◽  
Severino Alves Júnior ◽  
Maria Bocheńska
Keyword(s):  
Coordination Polymers ◽  
Luminescent Properties ◽  
Luminescence Spectroscopy ◽  
Tetracarboxylic Acid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lanthanide Cations ◽  
Solid Compounds ◽  
Diffraction Patterns ◽  
Solvothermal Methods

A series of new coordination polymers based on p-tert-butylcalix[4]arene- tetracarboxylic acid with Eu3+ (1a), Tb3+ (1b) and Tm3+ (1c) were prepared by hydro and solvothermal methods. The obtained solid compounds were characterized by infrared and luminescence spectroscopy, powder X-ray diffraction, scanning electron microscopy and thermogravimetric analysis. The infrared curves and the x-ray diffraction patterns indicate that the same crystalline structure was obtained for all lanthanides.

scholarly journals New Coordination Polymers of Selected Lanthanides with 1,2-Phenylenediacetate Linker: Structures, Thermal and Luminescence Properties

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4871
Author(s):  
Renata Łyszczek ◽  
Iwona Rusinek ◽  
Agnieszka Ostasz ◽  
Justyna Sienkiewicz-Gromiuk ◽  
Dmytro Vlasyuk ◽  
...  
Keyword(s):  
Single Crystal ◽  
Coordination Polymers ◽  
Structural Similarity ◽  
Spectroscopic Properties ◽  
Luminescence Spectroscopy ◽  
X Ray Diffraction ◽  
Metal Centers ◽  
X Ray ◽  
Gaseous Products ◽  
Carboxylate Groups

Solvothermal reactions of lanthanide (III) salts with 1,2-phenylenediacetic acid in N,N′-dimethylformamide (DMF) solvent lead to the formation of the metal complexes of the general formula Ln2(1,2-pda)3(DMF)2, where Ln(III) = Pr(1), Sm(2), Eu(3), Tb(4), Dy(5), and Er(6), 1,2-pda = [C6H4(CH2COO)2]2−. The compounds were characterized by elemental analysis, powder and single-crystal X-ray diffraction methods, thermal analysis methods (TG-DSC and TG-FTIR), infrared and luminescence spectroscopy. They exhibit structural similarity in the two groups (Pr, Sm, and Eu; Tb, Dy, and Er), which was reflected in their thermal behaviours and spectroscopic properties. Single-crystal X-ray diffraction studies reveal that Sm(2) and Eu(3) complexes form 2D coordination polymers with four crystallographically independent metal centers. Every second lanthanide ion is additionally coordinated by two DMF molecules. The 1,2-phenylenediacetate linker shows different denticity being: penta- and hexadentate while carboxylate groups exhibit bidentate-bridging, bidentate-chelating, and three-dentate bridging-chelating modes. The infrared spectra reflect divergence between these two groups of complexes. The complexes of lighter lanthanides contain in the structure coordinated DMF molecules, while in the structures of heavier complexes, DMF molecules appear in the inner and outer coordination sphere. Both carboxylate groups are deprotonated and engaged in the coordination of metal centers but in different ways in such groups of complexes. In the groups, the thermal decomposition of the isostructural complexes occurs similarly. Pyrolysis of complexes takes place with the formation of such gaseous products as DMF, carbon oxides, ortho-xylene, ethers, water, carboxylic acids, and esters. The complexes of Eu and Tb exhibit characteristic luminescence in the VIS region, while the erbium complex emits NIR wavelength.

Characterization of Pd⋯H–C interactions in bis-dimethyldithiocarbamate palladium(ii) and its deuterated analog by luminescence spectroscopy at variable pressure

2016 ◽  
Vol 45 (27) ◽  
pp. 10883-10886 ◽  
Author(s):  
Stéphanie Poirier ◽  
Elodie Tailleur ◽  
Hudson Lynn ◽  
Christian Reber
Keyword(s):  
Luminescence Band ◽  
Variable Pressure ◽  
Luminescence Spectroscopy ◽  
Deuterated Analog

Luminescence band maxima of bis-dimethyldithiocarbamate palladium(ii) and its deuterated analog show distinct shifts in three pressure ranges, indicative of three different interactions.

Scanning electron microscopy of plant cells using a variable-pressure SEM and cryogenic techniques

1993 ◽  
Vol 51 ◽  
pp. 260-261
Author(s):  
M. Yamada ◽  
K. Ueda ◽  
K. Kuboki ◽  
H. Matsushima ◽  
S. Joens
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Saturated Vapor ◽  
Plant Cells ◽  
Variable Pressure ◽  
Specimen Preparation ◽  
Operating Pressure ◽  
Vapor Pressures ◽  
Low Temperature Microscopy ◽  
Scanning Electron

Use of variable Pressure SEMs is spreading among electron microscopists The variable Pressure SEM does not necessarily require specimen Preparation such as fixation, dehydration, coating, etc which have been required for conventional scanning electron microscopy. The variable Pressure SEM allows operating Pressure of 1˜270 Pa in specimen chamber It does not allow microscopy of water-containing specimens under a saturated vapor Pressure of water. Therefore, it may cause shrink or deformation of water-containing soft specimens such as plant cells due to evaporation of water. A solution to this Problem is to lower the specimen temperature and maintain saturated vapor Pressures of water at low as shown in Fig. 1 On this technique, there is a Published report of experiment to have sufficient signal to noise ratio for scondary electron imaging at a relatively long working distance using an environmental SEM. We report here a new low temperature microscopy of soft Plant cells using a variable Pressure SEM (Hitachi S-225ON).

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