Photo- and thermal-responsive polymers containing azobenzene units in the main chain have been utilized as removable dispersants for single-walled carbon nanotubes (SWNTs) in organic solvents. Intermolecular interactions between SWNTs and the polymers are reversibly controllable by tuning the trans-cis composition.
An excess electron was attached to naphthalimide (NI) modified 12-mer oligodeoxynucleotides (ODNs) and
the electron transfer in DNA was investigated by monitoring the transient absorption of NI radical anion
(NI•-) during the pulse radiolysis. Formation of the transient absorption of NI•- was observed according to
the reaction of eaq
- with NI-modified ODN. Only 25% of eaq
- reacting with NI-modified ODN were observed
by the transient absorption of NI•-, which corresponds to electron transfer over no more than three base
pairs, suggesting a low mobility of an electron attached to DNA. Electron transfer in DNA was also studied
by γ-radiolysis of ODN containing 5-iododeoxyuridine (IU) as a second electron acceptor. Electron transfer
in DNA was estimated by the protection of dehalogenation of IU offered by NI during the γ-radiolysis of NI-
and IU-modified ODNs where the spacing between the NI and IU was varied. The protection effect became
very low by the insertion of three or four A−T base pairs between NI and IU. The results driven from both
pulse radiolysis and γ-radiolysis experiments were consistent with the low mobility of an excess electron in
DNA, which is in strong contrast to the occurrence of the long-range hole transfer in DNA.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.