Micro-environment inside the dendritic box and the effect of high static pressure as studied with ESR spin probe technique

• Published in: Chemical physics letters Vol. 474; no. 1; pp. 153 - 157
• Main Authors: Sueishi, Yoshimi, Miyazono, Keitaro, Iwamoto, Shinpei, Kotake, Yashige
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.05.2009
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2009.04.042

Inclusion complexes formed between the nitroxide probe and the dendrimer polyamidoamine or phenoxymethyl(methylhydrazono) were investigated with ESR spin probe technique. Dendrimer is a hyper-branched, sea urchin-shaped macromolecule that possesses multiple molecular cavities. Inclusion complexes formed between the nitroxide probe and the dendrimer were investigated with ESR spin probe technique. ESR spectral linewidths of the nitroxide probes with different hydrodynamic radius were monitored in the presence of the dendrimer to determine the probe’s rotational correlation time ( τ R). The agreement and disagreement with the order in the probe size and τ R was interpreted in terms of the probe–solvent–dendrimer intermolecular interaction. The activation volume Δ V ‡ was determined from high pressure experiments and there were distinctive Δ V ‡ inside dendritic boxes.