Selenium Substitution-Induced Hydration Changes of Crown Ethers As Tools for Probing Water Interactions with Supramolecular Macrocycles in Aqueous Solutions

2019 ◽  
Vol 123 (45) ◽  
pp. 9692-9698 ◽  
Author(s):  
Lin Jin ◽  
Bo Li ◽  
Zhiliyu Cui ◽  
Jie Shang ◽  
Yangxin Wang ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Crown Ethers ◽  
Selenium Substitution

scholarly journals Complex Uranyl Dichromates Templated by Aza-Crowns

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 462 ◽  
Author(s):  
Oleg Siidra ◽  
Evgeny Nazarchuk ◽  
Dmitry Charkin ◽  
Stepan Kalmykov ◽  
Anastasiya Zadoya
Keyword(s):  
Aqueous Solutions ◽  
Crown Ethers ◽  
Room Temperature ◽  
Organic Molecules ◽  
Negative Charge ◽  
Uranyl Compounds ◽  
One Dimensional ◽  
Chain Complexes ◽  
Aza Crown Ethers

Three new uranyl dichromate compounds templated by aza-crown templates were obtained at room temperature by evaporation from aqueous solutions: (H2diaza-18-crown-6)2[(UO2)2(Cr2O7)4(H2O)2](H2O)3 (1), (H4[15]aneN4)[(UO2)2(CrO4)2(Cr2O7)2(H2O)] (H2O)3.5 (2) and (H4Cyclam)(H4[15]aneN4)2[(UO2)6(CrO4)8(Cr2O7)4](H2O)4 (3). The use of aza-crown templates made it possible to isolate unprecedented and complex one-dimensional units in 2 and 3, whereas the structure of 1 is based on simple uranyl-dichromate chains. It is very likely that the presence of relatively large organic molecules of aza-crown ethers does not allow uranyl chromate chain complexes to condense into the units of higher dimensionality (layers or frameworks). In general, the formation of 1, 2, and 3 is in agreement with the general principles elaborated for organically templated uranyl compounds. The negative charge of the [(UO2)(Cr2O7)2(H2O)]2−, [(UO2)2(CrO4)2(Cr2O7)2(H2O)]4− and [(UO2)3(CrO4)4(Cr2O7)2]6− one-dimensional inorganic motifs is compensated by the protonation of all nitrogen atoms in the molecules of aza-crowns.

Some crown ethers as inhibitors for corrosion of stainless steel type 430 in aqueous solutions

Desalination ◽  
2010 ◽  
Vol 250 (2) ◽  
pp. 538-543 ◽  
Author(s):  
A.S. Fouda ◽  
M. Abdallah ◽  
S.M. Al-Ashrey ◽  
A.A. Abdel-Fattah
Keyword(s):  
Stainless Steel ◽  
Aqueous Solutions ◽  
Crown Ethers ◽  
Steel Type

Solute binding and catalytic effects in aqueous solutions of poly(vinyl crown ethers)

1975 ◽  
Vol 97 (20) ◽  
pp. 5932-5933 ◽  
Author(s):  
J. Smid ◽  
S. Shah ◽  
L. Wong ◽  
J. Hurley
Keyword(s):  
Aqueous Solutions ◽  
Crown Ethers ◽  
Catalytic Effects

Molecular recognition of crown ethers by β-lactose in aqueous solutions

2006 ◽  
Vol 16 (1) ◽  
pp. 45-46
Author(s):  
Nadezhda L. Volkova ◽  
Elena V. Parfenyuk
Keyword(s):  
Molecular Recognition ◽  
Aqueous Solutions ◽  
Crown Ethers
Sign in / Sign up

Export Citation Format

Share Document