Molecular Spectroscopic Studies on Organized Molecular Assemblies

Liang, Yingqiu; Zhang, Zhiqiang

doi:10.1080/01932699508943688

Cited by 2 publications

(1 citation statement)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Then the obtained accuracy of any orientational information is expected to be very high. However, only a limited number of studies have been applied to black films because of their instability. ,,− In a previous study, we devised a new temperature-controlled cell and established a method to obtain stable black lipid films in air. Using this strategy, we have succeeded in measuring a gel to liquid-crystalline phase transition temperature of black lipid films in air by FT-IR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Fourier Transform Infrared Spectra and Molecular Orientation of Black Lipid Films in Air Interacting with Metal Ions

Tano

Umemura

1997

Langmuir

View full text Add to dashboard Cite

Polarized Fourier transform infrared spectra of black lipid films in air withdrawn from aqueous dispersions of dimyristoylphosphatidylcholine (DMPC) have been recorded at various electrolyte concentrations. The spectra revealed that monovalent cations gave little effect, whereas polyvalent cations except Mg2+ gave remarkable effects on vibrational wavenumbers of both the acyl chain and phosphate ester group of DMPC in black lipid films. In the case of Mg2+, the effect was discerned only for the phosphate ester group. By use of thin film optics, molecular orientation of DMPC in the black lipid film in air was quantitatively evaluated as a function of electrolyte concentration. In the case of monovalent and Mg2+ cations, the orientation angle of the acyl chain axes from the surface normal was little affected by the electrolyte addition. On the other hand, the other polyvalent cations caused decrease of the average orientation angle from ca. 40° to 30°. The affinity of the cations for the DMPC lipid films in air are in the order of Zn2+ > La3+ ∼ Ca2+ ∼ Pb2+ > Mg2+ > Na+ ∼ Li+.

show abstract