Time-Resolved Fluorescence Anisotropy of Bicyclo[1.1.1]pentane/Tolane-Based Molecular Rods Included in Tris(o-phenylenedioxy)cyclotriphosphazene (TPP)

0444372 - ÚOCHB 2016 RIV US eng J - Journal Article
Cipolloni, Marco - Kaleta, Jiří - Mašát, Milan - Dron, P. I. - Shen, Y. - Zhao, K. - Rogers, C. T. - Shoemaker, R. K. - Michl, Josef
Time-Resolved Fluorescence Anisotropy of Bicyclo[1.1.1]pentane/Tolane-Based Molecular Rods Included in Tris(o-phenylenedioxy)cyclotriphosphazene (TPP).
Journal of Physical Chemistry C. Roč. 119, č. 16 (2015), s. 8805-8820. ISSN 1932-7447. E-ISSN 1932-7455
EU Projects: European Commission(XE) 227756 - DIPOLAR ROTOR ARRAY
Institutional support: RVO:61388963
Keywords : compound based approach * stretched polyethylene * solvent invironment
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 4.509, year: 2015
http://pubs.acs.org/doi/pdf/10.1021/acs.jpcc.5b01960

We examine the fluorescence anisotropy of rod-shaped guests held inside the Channels of tris(o-phenylenedioxy)cyclotriphosphazene (TPP) host nanocrystals, characterized by powder X-ray diffraction and solid state NMR spectroscopy. We address two issues: (i) are light polarization measurements on an aqueous colloidal solution of TPP nanocrystals meaningful, or is depolarization by scattering excessive? (ii) Can measurements of the rotational mobility of the included guests be performed at low enough loading levels to suppress depolarization by intercrystallite energy transfer? We find that meaningful measurements are possible and demonstrate that the long axis of molecular rods included in TPP channels performs negligible vibrational motion.
Permanent Link: http://hdl.handle.net/11104/0247011