Micellization of sodium decyl naphthalene sulfonate studied by (super 1)H NMR

Article Abstract:

(super 1)H chemical shift changes of a newly synthesized anionic surfactant, sodium decyl naphthalene sulfonate (SDNS), show that its critical micellar concentration (cmc) lies between 0.82 and 0.92 mM, which is in agreement with that measured by the surface tension method (0.8 mM). The difference in aromatic ring current effect on the naphthyl protons, the different changes in their spin-spin relaxation times upon micellization provides information about the relative arrangement of the naphthyl rings in the SDNS micelles.

Spectra, Sulfur, Micelles, Sulphur

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Binary and ternary complexes containing [alpha]-cyclodextrin and bromonaphthalene derivaties: A note of caution in interpreting UV absorption spectral data

Article Abstract:

A study used ultraviolet absorption spectra, NMR spectra, and phosphorescence measurements to confirm that [alpha]-cyclodextrin (CD) and 2-bromo-6-[beta]-D-glucopyranosidylnaphthalene (BGN) form only a binary complex and to characterize its properties. The binding constant for the Cd-BGN complex is found to be 886 plusmn 24 [M.sup.-1] and 770 plusmn 110 [M.sup.-1] from NMR and UV absorbance measurements, respectively.

Science & research, Research, Cyclodextrins, Phosphorescence

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Molecular modeling of bulk impurity segregation and impurity-mediated crystal habit modification of naphthalene and phenanthrene in the presence of heteroimpurity species

Article Abstract:

The ability to predict particle morphology (shape) in the presence of habit-modifying impurities is of great use in allowing the optimization of growth conditions to produce a required crystal habit. The method is illustrated by considering the morphological impact of a variety of host/additive systems, including naphthalene doped by biphenyl and phenanthrene crystallizing in the presence of biphenyl or anthracene.

Crystallization, Biphenyl (Compound)

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