Interaction between Water and Alkali Metal Ions and Its Temperature Dependence Revealed by Oxygen K-Edge X-ray Absorption Spectroscopy

2017 ◽  
Vol 121 (48) ◽  
pp. 10957-10964 ◽  
Author(s):  
Masanari Nagasaka ◽  
Hayato Yuzawa ◽  
Nobuhiro Kosugi
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Temperature Dependence ◽  
Absorption Spectroscopy ◽  
Alkali Metal Ions ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Reduction and Accumulation of Gold(III) byMedicago sativaAlfalfa Biomass:  X-ray Absorption Spectroscopy, pH, and Temperature Dependence

2000 ◽  
Vol 34 (20) ◽  
pp. 4392-4396 ◽  
Author(s):  
J. L. Gardea-Torresdey ◽  
K. J. Tiemann ◽  
G. Gamez ◽  
K. Dokken ◽  
Irene Cano-Aguilera ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
X Ray Absorption

The influence of alkali-metal ions on the molecular and supramolecular structure of manganese(II) complexes with tetrachlorophthalate ligands

2015 ◽  
Vol 70 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Hong-Dan Wang ◽  
Ming-Yang He ◽  
Qun Chen ◽  
Sheng-Chun Chen
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Supramolecular Structure ◽  
Critical Role ◽  
Alkali Metal Ions ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Space Groups ◽  
Dinuclear Structure

AbstractIn our efforts to investigate the influence of alkali-metal ions on the formation of metal complexes with polyhalogen-substituted benzenedicarboxylates, two manganese(II) complexes of tetrachlorophthalic acid (1,2-H2BDC-Cl4), [Mn2(1,2-BDC-Cl4)2(H2O)9]·H2O (1) and [MnK2(1,2-BDC-Cl4)2(H2O)4]n (2), were synthesized and structurally characterized. Single-crystal X-ray diffraction studies have revealed that complexes 1 and 2 crystallize in space groups P1̅ and Pbcn, respectively. Complex 1 shows a discrete dinuclear structure, while complex 2 features a two-dimensional heterometallic framework containing rare Mn–O–K linkages. The results clearly suggest that the introduction of alkali metal ions does play a critical role in the construction of complexes 1 and 2 with distinct dimensionality and connectivity. Their spectroscopic, thermal, and fluorescence properties have also been studied briefly.

scholarly journals Alkali Metal Intercalation in Curved Carbon Networks: X-Ray Structural Studies

2014 ◽  
Vol 70 (a1) ◽  
pp. C986-C986
Author(s):  
Natalie Sumner ◽  
Sarah Spisak ◽  
Alexander Zabula ◽  
Alexander Filatov ◽  
Andrey Rogachev ◽  
...  
Keyword(s):  
Energy Storage ◽  
Alkali Metal ◽  
Metal Ions ◽  
Anode Materials ◽  
Materials Science ◽  
Polyaromatic Hydrocarbons ◽  
Earth Metal ◽  
Alkali Metal Ions ◽  
X Ray ◽  
Carbon Networks

The intercalation of alkali metal ions into carbon-based aromatic systems is of great interest in materials science due to the increased need for stable anode materials with high capacity of energy storage. Currently, graphite, a sp2-hybirdized carbon network, is the key anode component in rechargeable Li-ion batteries. Carbon allotropes with nonplanar π-surfaces, ranging from fullerenes to nanotubes, are now under investigation as prospective anode materials. The curved carbon networks of fullerenes and nanotubes are often modeled by open bowl-shaped polyaromatic hydrocarbons, such as the smallest curved fullerene fragment, corannulene (C20H10). One of the most fascinating properties of such bowl-shaped polyarenes and fullerenes is their ability to reversibly uptake and delocalize extra electrons upon multi-electron reduction without significant rearrangement and deformation of their carbon framework [1,2]. Notably, the anode material fabricated from corannulene shows a high reversible lithium capacity (602 mAh/g). This is almost twice as high as the theoretical capacity of the commonly used fully lithiated planar graphite material (LiC6, 372 mAh/g). In our work, we target the X-ray structural elucidation of metal intercalation patterns of carbon-rich curved polyarenes with light alkali metal ions, such as Li and Na, and compare those with extended planar polyaromatic systems. Recently, we expanded this study to the light alkaline earth metal, Mg, as its atomic radius is very close to that of Li. In addition, magnesium is cost effective and abundant, and thus presents great interest in the emerging energy storage technologies.

Single crystal X-ray structure of Lawsone anion: Evidence for coordination of alkali metal ions and formation of naphthosemiquinone radical in basic media

2012 ◽  
Vol 1010 ◽  
pp. 38-45 ◽  
Author(s):  
Sunita Salunke-Gawali ◽  
Laxmi Kathawate ◽  
Yogesh Shinde ◽  
Vedavati G. Puranik ◽  
Thomas Weyhermüller
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Single Crystal ◽  
Alkali Metal Ions ◽  
X Ray

scholarly journals The Electronic Structure Signature of the Spin Cross-Over Transition of [Co(dpzca)2]

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Xin Zhang ◽  
Sai Mu ◽  
Yang Liu ◽  
Jian Luo ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Electronic Structure ◽  
Temperature Dependence ◽  
Absorption Spectroscopy ◽  
Spin State ◽  
Density Functional ◽  
Correlation Energy ◽  
High Spin State ◽  
X Ray ◽  
X Ray Absorption

Abstract The unoccupied electronic structure of the spin crossover molecule cobalt (II) N-(2-pyrazylcarbonyl)-2-pyrazinecarboxamide, [Co(dpzca)2] was investigated, using X-ray absorption spectroscopy (XAS) and compared with magnetometry (SQUID) measurements. The temperature dependence of the XAS and molecular magnetic susceptibility χmT are in general agreement for [Co(dpzca)2], and consistent with density functional theory (DFT). This agreement of magnetic susceptibility and X-ray absorption spectroscopy provides strong evidence that the changes in magnetic moment can be ascribed to changes in electronic structure. Calculations show the choice of Coulomb correlation energy U has a profound effect on the electronic structure of the low spin state, but has little influence on the electronic structure of the high spin state. In the temperature dependence of the XAS, there is also evidence of an X-ray induced excited state trapping for [Co(dpzca)2] at 15 K.

An X-ray absorption spectroscopy study of the pressure and temperature dependence of ZnBr2aqueous supercritical solutions

2001 ◽  
Vol 8 (2) ◽  
pp. 178-181 ◽  
Author(s):  
Y. Calzavara ◽  
V. Simonet ◽  
J. L. Hazemann ◽  
R. Argoud ◽  
O. Geaymond ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray ◽  
Supercritical Solutions ◽  
X Ray Absorption
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