Conformation of ethylhexanoate stabilizer on the surface of cds nanoparticles
CdS nanoparticles (NP), 22 Å , have been synthesized from cadmium 2-ethylhexanoate in DMSO as a uniformly sized dispersion. After ripening, CdS exhibits a sharp excitonic emission peak at 402 nm, while in freshly prepared dispersions a broad trapped emission at 510 nm dominates. By using one- and two-dimensional NMR spectroscopy, the conformation of the stabilizer adsorbed to the NP has been determined. The long hexyl chain of 2-ethylhexanoate ions spreads over the surface of NP, whereas the short ethyl end is primarily surrounded by DMSO. Surface modification of CdS with nucleophiles such as 4,4-bipyridine, thiophene, trimethylamine, and thiomolybdate anion results in a partial replacement of the stabilizer and reorientation of the hexyl chain away from the surface. The difference in the degree of replacement and/or conformational changes of 2-ethylhexanoate ion depends on the electron donor activity of the modifier. © 1999 American Chemical Society.
Publication Source (Journal or Book title)
Journal of Physical Chemistry B
Diaz, D., Rivera, M., Ni, T., Rodriguez, J., Castillo-Blum, S., Nagesha, D., Robles, J., Alvarez-Fregoso, O., & Kotov, N. (1999). Conformation of ethylhexanoate stabilizer on the surface of cds nanoparticles. Journal of Physical Chemistry B, 103 (45), 9854-9858. https://doi.org/10.1021/jp992121v