ChemInform Abstract: PHOTORESPONSIVE CROWN ETHERS. 8. AZOBENZENOPHANE-TYPE SWITCHED-ON CROWN ETHERS WHICH EXHIBIT AN ALL-OR-NOTHING CHANGE IN ION-BINDING ABILITY

1983 ◽  
Vol 14 (29) ◽  
Author(s):  
S. SHINKAI ◽  
T. MINAMI ◽  
Y. KUSANO ◽  
O. MANABE
Keyword(s):  
Crown Ethers ◽  
Ion Binding ◽  
Binding Ability

scholarly journals Ammonium Ion Binding Property of Naphtho-Crown Ethers Containing Thiazole as Sub-Cyclic Unit.

ChemInform ◽  
2005 ◽  
Vol 36 (12) ◽  
Author(s):  
Hong-Seok Kim ◽  
Kyung Soon Do ◽  
Ki Soon Kim ◽  
Jun Ho Shim ◽  
Geung Sig Cha ◽  
...  
Keyword(s):  
Crown Ethers ◽  
Ammonium Ion ◽  
Ion Binding ◽  
Binding Property ◽  
Cyclic Unit

Preparation, Photophysical, Electrochemical, and Ion-Binding Properties of Ru(II) Polypyridyl Complexes Containing a Crown Ether Unit

2011 ◽  
Vol 66 (9) ◽  
pp. 923-929 ◽  
Author(s):  
Feixiang Cheng ◽  
Ning Tang ◽  
Jishu Chen ◽  
Fan Wang ◽  
Longhai Chen
Keyword(s):  
Glassy Matrix ◽  
Ion Binding ◽  
Electrochemical Studies ◽  
Binding Properties ◽  
Binding Ability ◽  
Polypyridyl Ligands ◽  
Ligand Charge Transfer ◽  
Hyperchromic Effect ◽  
The Stability ◽  
Absorption And Emission Spectroscopy

Two polypyridyl ligands, 4`-(4,5-diazafluoren-9-ylimino)benzo-15-crown-5 (L1) and 4` -(4,5-diazafluoren- 9-ylimino)benzo-12-crown-4 (L2), and their Ru(II) complexes [(bpy)2RuL1](PF6)2 and [(bpy)2RuL2](PF6)2, respectively, have been synthesized and characterized. The two complexes display metal-to-ligand charge transfer absorptions at around 444 nm in CH3CN solution at r. t. and emission at around 573 nm in an EtOH-MeOH (4 : 1, v/v) glassy matrix at 77 K. Electrochemical studies of the complexes show one Ru(II)-centered oxidation at around 1.33 V and three ligandcentered reductions. The binding ability of the complexes with Na+ and Li+ has been investigated by UV/Vis absorption and emission spectroscopy and electrochemical titrations. Addition of Na+ and Li+ to solutions of the complexes results in a progressive quenching of the emission, a hyperchromic effect of the UV/Vis absorption, and a progressive cathodal shift of the Ru(II)-centered E1/2 potential. The stability constants for the stoichiometric 1 : 1 ratio of the complexes and the cations have been obtained by UV/Vis absorption titration.

scholarly journals Synthesis and electron paramagnetic resonance studies of chiral spin-labeled crown ethers

1984 ◽  
Vol 62 (3) ◽  
pp. 489-497 ◽  
Author(s):  
H. Dugas ◽  
P. Keroack ◽  
M. Ptak
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Crown Ether ◽  
Crown Ethers ◽  
Spin Interaction ◽  
Ion Binding ◽  
Paramagnetic Resonance ◽  
Dynamical Fluctuation ◽  
Electron Paramagnetic

The synthesis of syn and anti chiral dinitroxide [18]-crown-6 ethers and of a tetranitroxide crown ether is described. The existence of a spin–spin interaction for the syn isomer makes this spin-labeled crown ether probe particularly useful to follow by epr the effects of K+ ion binding, pH, solvent, and temperature. These observations are discussed in terms of a global dynamical fluctuation of the substituted crown ether.

Ammonium Ion Binding with Pyridine-Containing Crown Ethers

2000 ◽  
Vol 2 (19) ◽  
pp. 2947-2950 ◽  
Author(s):  
Theresa Chang ◽  
Aaron M. Heiss ◽  
Stuart J. Cantrill ◽  
Matthew C. T. Fyfe ◽  
Anthony R. Pease ◽  
...  
Keyword(s):  
Crown Ethers ◽  
Ammonium Ion ◽  
Ion Binding
Sign in / Sign up

Export Citation Format

Share Document