Marcela Almassio

• Centro Científico Tecnológico - Bahía Blanca

Model compounds and new polymeric materials bearing p-terphenylene and p-quaterphenylene units tethered by their para-positions were synthesized. PTF, with terphenylene groups tethered with C(CF3)2 groups, reached the higher polymerization degrees. All these materials, except PTF, show variable amounts of local ordering in the form of J- and H-aggr...

New photoactive segmented conjugated polymers with terphenylene chromophores were synthesized, and the chemosensing abilities to detect nitroaromatics compounds (NACs) of the polymeric thin films were evaluated in aqueous media. The thin films are strongly fluorescent, amorphous with no aggregation of the chromophores in the solid state and sensiti...

Two new fluorescent segmented conjugated polymers with either 1,4- or 2,6-distyrylnaphthalene chromophores and their model compounds were synthesized and the chemosensing abilities of the polymeric thin films to detect nitroaromatics (NACs) in aqueous media were evaluated. The structural, thermal and optical properties of the polymers were correlat...

Two new segmented conjugated polymers bearing distyrylbenzene chromophoric units and their model compounds were synthesized. The tendency of the model compounds to form H- and J-type aggregates in the amorphous matrix was greatly diminished by the twisted polymeric architecture. Fluorescence anisotropy measurements indicated good exciton mobilities...

A new regularly segmented conjugated polymer with diphenylanthryl chromophores bearing oxyethylene side chains was synthesized. The amorphous polymer was solution-processable. The formation of aggregated species in solid phase was hindered by the bent microstructure while fluorescence depolarization measurements showed high exciton mobilities among...

A new regularly segmented conjugated polymer bearing 2,7-diphenylfluorene chromophores tethered by isopropylidene connectors was synthesized by a relatively short synthetic route starting from easily available monomer synthons. Its photophysical properties were investigated using UV–vis absorption, steady state and time-resolved emission spectrosco...

A new approach for introducing porosity in fluorescent polymer films to increase sensing performance is presented. A novel segmented conjugated polymer composed of p-quaterphenylene segments tethered by their meta positions along the polymer main chain by 2,2-isopropylene spacers was synthesised. The bent nature of its microstructure originates amo...

A new regularly segmented conjugated polymer bearing 2,7-diphenylfluorene chromophores tethered by isopropylidene connectors was synthesized by a relatively short synthetic route starting from easily available monomer synthons. Its photophysical properties were investigated using UV-visible absorption, steady state and time-resolved emission spectr...

A mild selective protocol was used to prepare tetrakis(2-chlorophenylthio)anthracene from tetrabromoanthracene and sodium 2-chlorobenzenethiolate avoiding the thiolate self-attack. The uncatalyzed nucleophilic substitution of a series of mono-, di-, and tetrabrominated arenes by arylthiolate ions was attempted in mild conditions to investigate the...

Oligo(p-biphenylene-1,1-substituted methylene)s with p-biphenylene units tethered along the oligomer main chain by their para positions to isopropylene, perfluoroisopropylene, cyclohexylene or fluorenylene spacers were synthesised from dimesylates using the Ni homocoupling reaction. GPC, NMR, DSC and POM techniques showed that they are amorphous wi...

A new regularly segmented conjugated polymer with methoxy-substituted p-terphenylene units tethered by their meta positions along the polymer main chain was synthesised using the Suzuki cross-coupling reaction. The small size of the connector and lack of long lateral chains lead to a high density of rigid electrooptically active moieties in the str...

We report here on the experimental conditions for radical chlorination that provide improved yields of 2,5-bis(chloromethyl) pyridine and pyrazine, as well as on theoretical calculations which were performed in order to gain some insight regarding the factors that affect reactivity in these systems. The difficulties encountered previously in the met...

Summary The polymerizability of nitrogen-containing bissulfonium salts was analyzed. The poor homopolymerization results were attributed to sluggish quinodimethane formation. However, copolymerizations with the non-nitrogenated analogue sulfonium salt were successful. We report here the synthesis and characterization of a series of poly(1,4-phenyle...

A experimental study was performed regarding the influence of the base nature and solvent on the reactive intermediate concentration in the base-promoted bissulfonium salts polymerization, Such polymerization reaction is part of a synthetic procedure used to prepare conjugated polymers. In addition, a theoretical study suggest that a one-electron t...

A experimental study was performed regarding the influence of the base nature and solvent on the reactive intermediate concentration in the base-promoted bissulfonium salts polymerization. Such polymerization reaction is part of a synthetic procedure used to prepare conjugated polymers. In addition, a theoretical study suggest that a one-electron t...