Simultaneous SAXS and SANS Analysis for the Detection of Toroidal Supramolecular Polymers Composed of Noncovalent Supermacrocycles in Solution.

Hollamby, MJ; Aratsu, K; Pauw, BR; Rogers, SE; Smith, AJ; Yamauchi, M; Lin, X; Yagai, S

Abstract

Molecular self-assembly primarily occurs in solution. To better understand this process, techniques capable of probing the solvated state are consequently required. Small-angle scattering (SAS) has a proven ability to detect and characterize solutions, but it is rarely applied to more complex assembly shapes. Here, small-angle X-ray and neutron scattering are applied to observe toroidal assemblies in solution. Combined analysis confirms that the toroids have a core-shell structure, with a p-conjugated core and an alkyl shell into which solvent penetrates. The dimensions determined by SAS agree well with those obtained by (dried-state) atomic force microscopy. Increasing the number of naphthalene units in the molecular building block yields greater rigidity, as evidenced by a larger toroid and a reduction in solvent penetration into the shell. The detailed structural analysis demonstrates the applicability of SAS to monitor complex solution-based self-assembly.

Citation

Hollamby, M., Aratsu, K., Pauw, B., Rogers, S., Smith, A., Yamauchi, M., Lin, X., & Yagai, S. (2016). Simultaneous SAXS and SANS Analysis for the Detection of Toroidal Supramolecular Polymers Composed of Noncovalent Supermacrocycles in Solution. Angewandte Chemie International Edition, 128(34), 9890 - 9893. https://doi.org/10.1002/ange.201603370

• Journal Article Type: Article
• Acceptance Date: May 13, 2016
• Publication Date: Jul 7, 2016
• Journal: Angew Chem Int Ed Engl
• Print ISSN: 1433-7851
• Electronic ISSN: 1521-3773
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 128
• Issue: 34
• Pages: 9890 - 9893
• DOI: https://doi.org/10.1002/ange.201603370
• Keywords: nanorings, toroids, self-assembly, small-angle scattering, supramolecular chemistry
• Public URL: https://keele-repository.worktribe.com/output/406708
• Publisher URL: http://onlinelibrary.wiley.com/doi/10.1002/ange.201603370/abstract;jsessionid=837A2302AD887F80675E6E9D59CB9199.f01t01