13C NMR Study of Poly(N-vinylpyrrolidone)–Cu(II) Complex in Aqueous Solution
نویسندگان
چکیده
منابع مشابه
Hyaluronan forms specific stable tertiary structures in aqueous solution: a 13C NMR study.
13C NMR spectra of aqueous solutions of hyaluronan (HA) of high molecular mass, before and after digestion with testicular hyaluronidase, and of hyaluronan methyl ester were obtained at 125.8 MHz. Carbonyl peaks were assigned by using selective decoupling techniques. Spectra of digested and undigested HA showed sharp signals, except for that assigned to the acetamido carbonyl carbon in the high...
متن کاملThermodynamic study of Ion pairing in Aqueous solution of 〖BaF〗_2 by (_^19)F-NMR
The ion-pair association constant values, related to the reaction + were determined by means of the NMR spectroscopy. The values of the thermodynamic functions of the ion pairing process were calculated on the basis of the NMR results. In addition, the association entropy was found to be dependent on the temperature. Comparing the experimental data and the Fuoss theory it is found that ion-pa...
متن کاملMolecular Mobility of Sucrose in Aqueous Solution Studied by 13C NMR Relaxation
From the tem perature and concentration dependence o f the 13C spin lattice relaxation times o f the 12 carbon atom s o f the sucrose molecule the ro ta tional dynam ics o f the sugar molecules are determ ined. N o indication for conform ational m obility o f the rings is found. The exocyclic hydroxym ethyl groups possess extra m obility. The m odels used for the description are critical ly di...
متن کاملSpectrophotometric Study of Complex Formations between Alprazolam and Some Transition Metal Ions in Non Aqueous Solution
In this study, the complexation reaction between Alprazolam (ALP) and metal ions (Zn2+, Ni2+, Cu2+ and Co2+) was investigated by using spectrophotometry in ethanol solvent. The stoichiometry of M+/ALP complexes was calculated by applying the Job, molar ratio and Continuous Changes methods and the relevant diagrams were plotted for each metal ions in each method. The results show that the obtain...
متن کاملA 13C-NMR study of azacryptand complexes.
An azacryptand has been solubilised in aqueous media containing 50% (v/v) dimethyl sulphoxide. (13)C-NMR has been used to determine how the azacryptand is affected by zinc binding at pH 10. Using (13)C-NMR and (13)C-enriched bicarbonate we have been able to observe the formation of 4 different carbamate derivatives of the azacryptand at pH 10. The azacryptand was shown to solubilise zinc or cad...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Polymer Journal
سال: 1994
ISSN: 0032-3896,1349-0540
DOI: 10.1295/polymj.26.479