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Interaction between Poly(9,9-bis(6′-N,N,N-trimethylammonium)hexyl)fluorene phen...
Monteserín, María; Burrows, Hugh D.; Valente, Artur J. M.; Mallavia, Ricardo; Paolo, Roberto E. Di; Maçanita, António L.; Tapia, María J.The interaction between three poly(9,9-bis(6-N,N,N-trimethylammonium)hexyl)fluorene phenylene) bromide (HTMA-PFP) samples of different molecular weights (Mn = 14.5, 30.1 and 61.3 kg/mol) and both dsDNA and ssDNA secondary structures has been studied using UV−visible absorption and fluorescence spectroscopies (including steady-state, time-resolved, and anisotropy measurements for the latter), viscosity, and elec...
Picosecond Structural Relaxation of Abietic Acid Based Amine End Capped Para-Ph...
Paolo, Roberto E. Di; Gigante, Barbara; Esteves, Maria A.; Pires, Natércia; Santos, Célia; Lameiro, Maria H.; Melo, João Seixas de; Burrows, Hugh D.The synthesis and photophysical properties of six new abietic acid based amine end-capped p-phenylenevinylene trimers (AECPV3) in their lowest excited singlet states are presented. The AECPV3 compounds show a large red-shift of both the absorption (25-30 nm) and emission (37-42 nm) maxima with respect to those of the corresponding trimers. Picosecond time-resolved fluorescence data reveal the presence of a fast...
Modulating the Emission Intensity of Poly-(9,9-bis(6‘-N,N,N-trimethylammonium)h...
Monteserín, María; Burrows, Hugh D.; Valente, Artur J. M.; Lobo, Victor M. M.; Mallavia, Ricardo; Tapia, María J.; García-Zubiri, Iñigo X.The interaction between the cationic HTMA-PFP (Poly-(9,9-bis(6‘-N,N,N-trimethylammonium)hexyl-fluorene phenylene) bromide) and oppositely charged sodium n-alkyl sulfonate surfactants of different chain lengths has been studied in DMSO−water solutions (4% v/v) by UV−visible absorption, fluorescence spectroscopy, fluorescence lifetimes, electrical conductivity, and 1H NMR spectroscopy. Polymer−surfactant interact...
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