High LaIII Affinity of a Bis(spirobenzopyran) Azacrown Ether and Photoinduced Switching of its Ion Selectivity between Multivalent and Monovalent Metal Ions

1997 ◽  
Vol 36 (22) ◽  
pp. 2452-2454 ◽  
Author(s):  
Keiichi Kimura ◽  
Tomohito Utsumi ◽  
Takashi Teranishi ◽  
Masaaki Yokoyama ◽  
Hidefumi Sakamoto ◽  
...  
Keyword(s):  
Metal Ions ◽  
Ion Selectivity ◽  
Azacrown Ether ◽  
Monovalent Metal

Two-Photon Sensor for Metal Ions Derived from Azacrown Ether

2004 ◽  
Vol 69 (17) ◽  
pp. 5749-5751 ◽  
Author(s):  
Hwan Myung Kim ◽  
Mi-Yun Jeong ◽  
Hyun Cheol Ahn ◽  
Seung-Joon Jeon ◽  
Bong Rae Cho
Keyword(s):  
Metal Ions ◽  
Azacrown Ether ◽  
Two Photon

scholarly journals Dissolution mechanisms of β-tricalcium phosphate doped with monovalent metal ions

2010 ◽  
Vol 118 (1378) ◽  
pp. 451-457 ◽  
Author(s):  
Naoyuki MATSUMOTO ◽  
Katsumi YOSHIDA ◽  
Kazuaki HASHIMOTO ◽  
Yoshitomo TODA
Keyword(s):  
Metal Ions ◽  
Tricalcium Phosphate ◽  
Monovalent Metal

scholarly journals STUDY OF REMOVAL OF METAL IONS IN WATER USING ZEOLITES SYNTHESIZED WITH CHARCOAL ASHES

2006 ◽  
Vol 05 (3) ◽  
pp. 21-30
Author(s):  
Denise Alves FUNGARO ◽  
Juliana de Carvalho IZIDORO
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Ion Selectivity ◽  
Coal Ash ◽  
Electroplating Effluent ◽  
Zeolitic Material ◽  
Equilibrium Data ◽  
Metal Ion Selectivity ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

The capacity of synthesized zeolites from Brazilian coal ash for the removal of metal ions from aqueous solutions has been investigated. Equilibrium data obtained have been found to fit both the Langmuir and Freundlich adsorption isotherms. The zeolitic material prepared with coal ash from baghouse filter showed the highest removal efficiencies. The metal ion selectivity of this product was determined as: Pb2+ > Cd2+ > Cu2+ > Zn2+ > Ni2+. The maximum cation exchange capacities were between 32.9 and 246.9 mg g-1. Tests showed that the zeolitic material was suitable for removal of zinc from electroplating effluent.

Thermally regenerable metal-organic framework with high monovalent metal ion selectivity

2021 ◽  
Vol 405 ◽  
pp. 127037
Author(s):  
Simeng Zhang ◽  
Ranwen Ou ◽  
Hongyu Ma ◽  
Jun Lu ◽  
Mark M. Banaszak Holl ◽  
...  
Keyword(s):  
Metal Ion ◽  
Ion Selectivity ◽  
Metal Organic Framework ◽  
Monovalent Metal ◽  
Metal Organic ◽  
Metal Ion Selectivity ◽  
Organic Framework

scholarly journals Tuning the Voltage Dependence of Tetraethylammonium Block with Permeant Ions in an Inward-Rectifier K+ Channel

1999 ◽  
Vol 114 (3) ◽  
pp. 415-426 ◽  
Author(s):  
Maria Spassova ◽  
Zhe Lu
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Ion Selectivity ◽  
Inward Rectifier ◽  
K Channel ◽  
Alkali Metal Ions ◽  
Internal Site ◽  
External Site ◽  
Ion Binding Sites

To understand the role of permeating ions in determining blocking ion–induced rectification, we examined block of the ROMK1 inward-rectifier K+ channel by intracellular tetraethylammonium in the presence of various alkali metal ions in both the extra- and intracellular solutions. We found that the channel exhibits different degrees of rectification when different alkali metal ions (all at 100 mM) are present in the extra- and intracellular solution. A quantitative analysis shows that an external ion site in the ROMK1 pore binds various alkali metal ions (Na+, K+, Rb+, and Cs+) with different affinities, which can in turn be altered by the binding of different permeating ions at an internal site through a nonelectrostatic mechanism. Consequently, the external site is saturated to a different level under the various ionic conditions. Since rectification is determined by the movement of all energetically coupled ions in the transmembrane electrical field along the pore, different degrees of rectification are observed in various combinations of extra- and intracellular permeant ions. Furthermore, the external and internal ion-binding sites in the ROMK1 pore appear to have different ion selectivity: the external site selects strongly against the smaller Na+, but only modestly among the three larger ions, whereas the internal site interacts quite differently with the larger K+ and Rb+ ions.

Synthesis and adsorption properties of metal ions of novel azacrown ether crosslinked chitosan

2006 ◽  
Vol 100 (4) ◽  
pp. 2705-2709 ◽  
Author(s):  
Xueyong Zhang ◽  
Shimin Ding ◽  
Yuting Wang ◽  
Xianghua Feng ◽  
Qi Peng ◽  
...  
Keyword(s):  
Metal Ions ◽  
Adsorption Properties ◽  
Azacrown Ether ◽  
Crosslinked Chitosan

scholarly journals Metal Ion Selectivity of Kojate Complexes: A Theoretical Study

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Sarita Singh ◽  
Jyoti Singh ◽  
Sunita Gulia ◽  
Rita Kakkar
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Density Functional ◽  
Ion Selectivity ◽  
Divalent Metal Ions ◽  
High Energies ◽  
Square Planar ◽  
Metal Ion Selectivity ◽  
Carbonyl Bond ◽  
Complexation Reactions

Density functional calculations have been performed on four-coordinate kojate complexes of selected divalent metal ions in order to determine the affinity of the metal ions for the kojate ion. The complexation reactions are characterized by high energies, showing that they are highly exothermic. It is found that Ni(II) exhibits the highest affinity for the kojate ion, and this is attributed to the largest amount of charge transfer from the ligand to the metal ion. The Ni(II) complex has distorted square planar structure. The HOMOs and LUMOs of the complexes are also discussed. All complexes display a strong band at ~1500 cm−1 corresponding to the stretching frequency of the weakened carbonyl bond. Comparison of the complexation energies for the two steps shows that most of the complexation energy is realized in the first step. The energy released in the second step is about one-third that of the first step.

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