جستجوی مقالات مرتبط با کلیدواژه « p-sulfonatocalix [4] arene » در نشریات گروه « شیمی »
تکرار جستجوی کلیدواژه «p-sulfonatocalix [4] arene» در نشریات گروه «علوم پایه»-
The acid dissociation constants of the hydroxyl groups in 25, 26, 27, 28-tetrahydroxy-5, 11, 17, 23-tetrasulphonic-calix[4]arene (SC4) were determined at 25οC by a combination of potentiometric and spectrophotometric titration method. The first and second acid dissociation constants (pKa1, pKa2) were found to be 3.19 and 12.1, which demonstrated pKa shift due to intramolecular hydrogen bonding interactions among hydroxyl groups in SC4.
Keywords: p-sulfonatocalix[4]arene, acid–base properties, acid dissociation constant} -
Calixarenes are a readily available and important class of macrocycles in supramolecularchemistry. Calixarenes have generated considerable interest due to their basket shaped structureand as useful building blocks to synthesize selective receptors for the guest species, notably alkali,alkaline earth, lanthanide and transition metal cations. In this work studied on the complexingproperties of a para-sulfonato-calix [4] arene (C281424016S4) with alkali metal cations. Thecomplexation properties of para-sulfonato- calix [4] arene were studied by Hartree Fock method.The complexes showed different properties for the different cations, depending on the cations andthe position of the substituents grafted on the ligand.Keywords: P-sulfonatocalix [4] arene, Guest, DFT, HF, NMR, Hydrogen bonding, Nanostructure, chemical shift}
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The complexation of Alkali metal cations by the water-soluble p-sulfonic acid calix(4)arenewas thermodynamically characterized using spectrophotometeric data which are consistentwith the formation of a 1:1 complex resulting from electrostatic interactions between thesulfonato groups and alkali metal cations. In this study, we determined the formationconstants (log K) of the complexes and have compared in deferent pH (1.0 and 1.5) at 25°C.Keywords: Formation constant, spectrophotometeric titration, alkali metal cation, p-sulfonatocalix(4)arene}
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