Spectroscopic studies of self-association due to hydrogen bonding

Singh, Surjit; Rao, C. N. R.

doi:10.1021/j100863a044

Cited by 92 publications

(27 citation statements)

References 5 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As expected from the comparative weakness of the SH · · · hydrogen bond [10,11,31], the dimerization constant of the dithiophosphinic acid extractant, HC301, (K 2 = 0.67) is significantly smaller than those reported for the analogous oxygen-containing phosphinic acid (HC272, K 2 = 1.0 × 10 3 ) [32] and monothiophosphinic acid (HC302, K 2 = 20) [12] extractants. The results for HC301 can be compared to those reported for bis(2-ethylhexyl)dithiophosphoric acid (HDEHDTP) in deuterated cyclohexane [25], which can trimerize with K 3 = 0.14.…”

Section: Discussionmentioning

confidence: 72%

Influence of aggregation on the extraction of trivalent lanthanide and actinide cations by purified Cyanex 272, Cyanex 301, and Cyanex 302

Jensen¹,

Bond²

2002

Radiochimica Acta

101

View full text Add to dashboard Cite

Extraction / Cyanex / Aggregation / Americium / CuriumSummary. The extraction of trivalent lanthanide (Sm 3+ , Eu 3+ ) and actinide (Am 3+ , Cm 3+ ) cations from 1.0 M NaNO 3 into n-dodecane solutions of bis(2,4,4-trimethylpentyl)phosphinic acid (HC272), bis(2,4,4-trimethylpentyl)monothiophosphinic acid (HC302), and bis(2,4,4-trimethylpentyl)dithiophosphinic acid (HC301) is reported. In each case, the dependence of the distribution ratios on the total extractant concentration is approximately second power. Using NMR, the dimerization constant of HC301 is determined to be 0.67 ± 0.06 at 25.0 • C in deuterated n-heptane, implying that the average aggregation of the extractant changes greatly across the extractant concentration range studied. When the effect of aggregation is considered for each of the extractants, the stoichiometries of the extracted complexes are found to be M(H(C272) 2 ) 3 , M(C302) 3 , and M(C301) 3 .

show abstract

Section: Discussionmentioning

confidence: 72%

Influence of aggregation on the extraction of trivalent lanthanide and actinide cations by purified Cyanex 272, Cyanex 301, and Cyanex 302

Jensen¹,

Bond²

2002

Radiochimica Acta

101

View full text Add to dashboard Cite

show abstract

“…3). Regardless of the value of the dirnerization constant, the procedure proposed here should yield more accurate results than the spectroscopic method, where the error in AH, determination is estimated to be 10% or more (22).…”

Section: The Use Of Tninimization It1 Cletertninitzg K and A H Ofmentioning

confidence: 96%

On the analysis of calorimetric data in the study of dimerization of carboxylic acids in nonpolar solvents

Góralski¹,

Taniewska-Osińska²

1983

Can. J. Chem.

View full text Add to dashboard Cite

PAWEL G~R A L S K Iand STEFANIA TANIEWSKA-OSINSKA. Can. J . Chem. 61. 2209Chem. 61. (1983.The calorimetric dilution method was analyzed for the accuracy with which thc equilibrium constant (K,,) and clirnerization enthalpy (AH,,) can be detcrrnined. The calculations wcrc carried out using the ideal monomer-dimer model. It was found that the error in determining the functions dcscribing dimerization increases strongly with rising K,, values but is independent of AH,, values. Doubt is expressed whether dimerization and trimerization can be studied simultaneously by the calorimetric method. A suggestion is made to use spectroscopy and calorimetry jointly rather than separately to determine Kc, and AH,, values rapidly and conveniently, producing. in many cases, more accurate results. On a Cvalui la prCcision de la mCthode de dilution calorimCtrique dans la determination de la constante d'tquilibre (K,') et dc I'enthalpie de dimCrisation (AH,,). On a effectuC les calculs en utilisant un [nodele monomkre-dimere idCal. En dCterminant les fonctions qui dCcrivent la dimirisation on trouvd que I'erreur augnlente cle faqon mArquCe lorsque la valcur de K, , augmente mais elle ne dkpend pas de AH,,. On doute que I'on puisse Ctudicr simultandmcnt la dimkrisation et la trimirisation par la nlithode calorimCtrique. On propose d'utiliscr la spectroscopic conjointenlent avec la calorinlitrie et non sCparCment pour dCterminer rapidcrnent de faqon convcnablc Ics valeurs de K,, et de AHd. On obtient dans plusieurs cas des rCsultats plus prCcis.[Traduit par le journal]

show abstract

“…We have observed that V E and Á S values are significantly largest in the ternary mixture containing 2-butanol than in the system with 1-butanol. Although sterically hindered alcohols are considerably less associated [13] and they have smaller hydrogen-bonds energies [14], the breaking of more bonds in the mixtures of 2-butanol outweighs the smaller contribution per bond to the investigated properties [15].…”

Section: Resultsmentioning

confidence: 97%

Densities and Speeds of Sound of the Ternary Mixture 2-Butanol Plus 1-Chlorobutane Plus Tetrahydrofuran

Valén

Gascón

Lafuente

et al. 2003

Physics and Chemistry of Liquids

View full text Add to dashboard Cite

Experimental densities () and speeds of sound (u) were obtained for the ternary system (2-butanol þ 1-chlorobutane þ tetrahydrofuran) at three temperatures: 283.15, 298.15 and 313.15 K. Excess molar volumes (V E ) and isentropic compressibility deviations (Á S ) have been calculated from experimental data. A discussion of the thermodynamic behavior of the ternary system in terms of molecular interactions and structural and packing effects is presented.

show abstract

Spectroscopic studies of self-association due to hydrogen bonding

Cited by 92 publications

References 5 publications

Influence of aggregation on the extraction of trivalent lanthanide and actinide cations by purified Cyanex 272, Cyanex 301, and Cyanex 302

Influence of aggregation on the extraction of trivalent lanthanide and actinide cations by purified Cyanex 272, Cyanex 301, and Cyanex 302

On the analysis of calorimetric data in the study of dimerization of carboxylic acids in nonpolar solvents

Densities and Speeds of Sound of the Ternary Mixture 2-Butanol Plus 1-Chlorobutane Plus Tetrahydrofuran

Contact Info

Product

Resources

About