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Papers by Laura Aronica

European Journal of Organic Chemistry, Sep 24, 2014

In this study we use a tandem carbonylative Sonogashira reactioncyclisation process to construct ... more In this study we use a tandem carbonylative Sonogashira reactioncyclisation process to construct alkylidene functionalised isochromans in high yields and with complete stereoselectivity (only Z isomers are formed). The reaction is performed in the absence of CuI co-catalyst, with a small amount of PdCl2(PPh3)2 (0.2-0.5 mol-%) and aryl iodides bearing both electron donating and electron withdrawing substituents can be successfully employed. 2-(2-Ethynylphenyl)ethanol 1 was chosen as model substrate and prepared according to the method described in Scheme 3.

European Journal of Organic Chemistry, Sep 24, 2014

In this study we use a tandem carbonylative Sonogashira reactioncyclisation process to construct ... more In this study we use a tandem carbonylative Sonogashira reactioncyclisation process to construct alkylidene functionalised isochromans in high yields and with complete stereoselectivity (only Z isomers are formed). The reaction is performed in the absence of CuI co-catalyst, with a small amount of PdCl2(PPh3)2 (0.2-0.5 mol-%) and aryl iodides bearing both electron donating and electron withdrawing substituents can be successfully employed. 2-(2-Ethynylphenyl)ethanol 1 was chosen as model substrate and prepared according to the method described in Scheme 3.

Transition Metal Promoted Synthesis of Isoindoline Derivatives

Transition Metal Promoted Synthesis of Isoindoline Derivatives

Solid-state optical and electrical properties of new chiral oligothiophenes: the central role of supramolecular organization

Solid-state optical and electrical properties of new chiral oligothiophenes: the central role of supramolecular organization

Solution and solid-state supramolecular aggregates of new chiral oligothiophenes: synthesis and spectroscopic characterization

Solution and solid-state supramolecular aggregates of new chiral oligothiophenes: synthesis and spectroscopic characterization

Metal vapour derived supported palladium catalysts for Sonogashira carbonylative reactions

Metal vapour derived supported palladium catalysts for Sonogashira carbonylative reactions

“Silylation-desilylation of propargyl tosylamides: easy sinthesis of a,ß-unsaturated aldehydes and ß-lactams”

“Silylation-desilylation of propargyl tosylamides: easy sinthesis of a,ß-unsaturated aldehydes and ß-lactams”

Nuove vie di sintesi di derivati aldeidici mediante Sililformilazione-Desililazione di acetileni funzionalizzati

Nuove vie di sintesi di derivati aldeidici mediante Sililformilazione-Desililazione di acetileni funzionalizzati

Tris -Ethynylphenyl-amine Fluorophores: Synthesis, Characterisation and Test of Performances in Luminescent Solar Concentrators

ChemistrySelect, Feb 12, 2018

Two fluorescent dyes (CT‐tEPhA=3,3′,3′′‐(nitrilotris(benzene‐4,1‐diyl))tris(1‐(thiophen‐2‐yl)prop... more Two fluorescent dyes (CT‐tEPhA=3,3′,3′′‐(nitrilotris(benzene‐4,1‐diyl))tris(1‐(thiophen‐2‐yl)prop‐2‐yn‐1‐one and T‐tEPhA=tris(4‐(thiophen‐2‐ylethynyl)phenyl)amine) have been synthesised and characterised in different solvents and in a poly(methyl methacrylate) (PMMA) matrix. In both cases, relatively high Stokes shifts (SS) and quantum yields (QY) have been displayed. Notably, CT‐tEPhA based on a mild electron‐attracting carbonyl group coupled with the electron‐donating amino‐centre, shows superior light emitting properties (higher SS, red‐shifted emission, QY > 40%) suggesting application in light harvesting systems. Photocurrent measurements of CT‐tEPhA/PMMA films yield a maximum optical efficiency of 6.32% that is greater than that of fluorophores with same emission window and comparable to that of red‐emitting ones. This efficiency might be improved by extending the push‐pull character of CT‐tEPhA to cover the maximum efficiency of the Si‐based PV cell. Nevertheless, these results clearly support the use of push‐pull fluorophores based on the tris(4‐ethynylphenyl)amine core in solar collectors.

Tris -Ethynylphenyl-amine Fluorophores: Synthesis, Characterisation and Test of Performances in Luminescent Solar Concentrators

ChemistrySelect, Feb 12, 2018

Two fluorescent dyes (CT‐tEPhA=3,3′,3′′‐(nitrilotris(benzene‐4,1‐diyl))tris(1‐(thiophen‐2‐yl)prop... more Two fluorescent dyes (CT‐tEPhA=3,3′,3′′‐(nitrilotris(benzene‐4,1‐diyl))tris(1‐(thiophen‐2‐yl)prop‐2‐yn‐1‐one and T‐tEPhA=tris(4‐(thiophen‐2‐ylethynyl)phenyl)amine) have been synthesised and characterised in different solvents and in a poly(methyl methacrylate) (PMMA) matrix. In both cases, relatively high Stokes shifts (SS) and quantum yields (QY) have been displayed. Notably, CT‐tEPhA based on a mild electron‐attracting carbonyl group coupled with the electron‐donating amino‐centre, shows superior light emitting properties (higher SS, red‐shifted emission, QY > 40%) suggesting application in light harvesting systems. Photocurrent measurements of CT‐tEPhA/PMMA films yield a maximum optical efficiency of 6.32% that is greater than that of fluorophores with same emission window and comparable to that of red‐emitting ones. This efficiency might be improved by extending the push‐pull character of CT‐tEPhA to cover the maximum efficiency of the Si‐based PV cell. Nevertheless, these results clearly support the use of push‐pull fluorophores based on the tris(4‐ethynylphenyl)amine core in solar collectors.

Chemistry: A European Journal, Nov 12, 2020

We report the first observation of circular polarized electroluminescence (CPEL) in thin films of... more We report the first observation of circular polarized electroluminescence (CPEL) in thin films of self-organized oligothiophenes. Four new 1,4-phenylene and 9H-carbazole-based oligothiophenes were ad hoc designed to ensure efficient spontaneous formation of chiral supramolecular order. They were easily synthetized and their chiroptical properties in thin films were measured. Circularly polarized luminescence (CPL) spectra revealed glum in the order of 10 -2 on a wide wavelengths range, originating from their self-organized chiral supramolecular organization. These molecules have reasonable properties as organic semiconductors and for this reason they can constitute the active layer of circularly-polarized organic light-emitting diodes (CP-OLEDs). Thus, we could investigate directly their electroluminescence (EL) and CPEL, without resorting to blends, but rather in a simple multilayer device with basic architecture. This is the first example of a CP-OLED with active layer made only of a small organic compound.

Chemistry: A European Journal, Nov 12, 2020

We report the first observation of circular polarized electroluminescence (CPEL) in thin films of... more We report the first observation of circular polarized electroluminescence (CPEL) in thin films of self-organized oligothiophenes. Four new 1,4-phenylene and 9H-carbazole-based oligothiophenes were ad hoc designed to ensure efficient spontaneous formation of chiral supramolecular order. They were easily synthetized and their chiroptical properties in thin films were measured. Circularly polarized luminescence (CPL) spectra revealed glum in the order of 10 -2 on a wide wavelengths range, originating from their self-organized chiral supramolecular organization. These molecules have reasonable properties as organic semiconductors and for this reason they can constitute the active layer of circularly-polarized organic light-emitting diodes (CP-OLEDs). Thus, we could investigate directly their electroluminescence (EL) and CPEL, without resorting to blends, but rather in a simple multilayer device with basic architecture. This is the first example of a CP-OLED with active layer made only of a small organic compound.

Breaking the symmetry between left-handed and right-handed chiral optical modes in planar Fabry-P... more Breaking the symmetry between left-handed and right-handed chiral optical modes in planar Fabry-Pérot (FP) microcavities would enable a variety of chiral light-matter phenomena, with applications in spintronics, polaritonics, and chiral lasing. Such symmetry breaking, however, has remained underexplored and has been purported to require Faraday mirrors. We present a simple solution to chiral symmetry breaking in FP microcavities, preserving low mode volumes by embedding organic thin films exhibiting "apparent circular dichroism" (ACD); an optical phenomenon based on interfering linear birefringence and linear dichroism with offset optical axes. ACD interactions are opposite for counter-propagating light and increase with path length. Consequently, we demonstrated chiral asymmetry of the cavity modes over an order of magnitude larger than that of the isolated thin film. Through both circular dichroism spectroscopy and simulation using theoretical scattering matrix methods, we characterize the spatial, spectral, and angular chiroptical responses of this new type of chiral microcavity.

Breaking the symmetry between left-handed and right-handed chiral optical modes in planar Fabry-P... more Breaking the symmetry between left-handed and right-handed chiral optical modes in planar Fabry-Pérot (FP) microcavities would enable a variety of chiral light-matter phenomena, with applications in spintronics, polaritonics, and chiral lasing. Such symmetry breaking, however, has remained underexplored and has been purported to require Faraday mirrors. We present a simple solution to chiral symmetry breaking in FP microcavities, preserving low mode volumes by embedding organic thin films exhibiting "apparent circular dichroism" (ACD); an optical phenomenon based on interfering linear birefringence and linear dichroism with offset optical axes. ACD interactions are opposite for counter-propagating light and increase with path length. Consequently, we demonstrated chiral asymmetry of the cavity modes over an order of magnitude larger than that of the isolated thin film. Through both circular dichroism spectroscopy and simulation using theoretical scattering matrix methods, we characterize the spatial, spectral, and angular chiroptical responses of this new type of chiral microcavity.

European Journal of Organic Chemistry, Sep 24, 2014

In this study we use a tandem carbonylative Sonogashira reactioncyclisation process to construct ... more In this study we use a tandem carbonylative Sonogashira reactioncyclisation process to construct alkylidene functionalised isochromans in high yields and with complete stereoselectivity (only Z isomers are formed). The reaction is performed in the absence of CuI co-catalyst, with a small amount of PdCl2(PPh3)2 (0.2-0.5 mol-%) and aryl iodides bearing both electron donating and electron withdrawing substituents can be successfully employed. 2-(2-Ethynylphenyl)ethanol 1 was chosen as model substrate and prepared according to the method described in Scheme 3.

European Journal of Organic Chemistry, Sep 24, 2014

In this study we use a tandem carbonylative Sonogashira reactioncyclisation process to construct ... more In this study we use a tandem carbonylative Sonogashira reactioncyclisation process to construct alkylidene functionalised isochromans in high yields and with complete stereoselectivity (only Z isomers are formed). The reaction is performed in the absence of CuI co-catalyst, with a small amount of PdCl2(PPh3)2 (0.2-0.5 mol-%) and aryl iodides bearing both electron donating and electron withdrawing substituents can be successfully employed. 2-(2-Ethynylphenyl)ethanol 1 was chosen as model substrate and prepared according to the method described in Scheme 3.

Transition Metal Promoted Synthesis of Isoindoline Derivatives

Transition Metal Promoted Synthesis of Isoindoline Derivatives

Solid-state optical and electrical properties of new chiral oligothiophenes: the central role of supramolecular organization

Solid-state optical and electrical properties of new chiral oligothiophenes: the central role of supramolecular organization

Solution and solid-state supramolecular aggregates of new chiral oligothiophenes: synthesis and spectroscopic characterization

Solution and solid-state supramolecular aggregates of new chiral oligothiophenes: synthesis and spectroscopic characterization

Metal vapour derived supported palladium catalysts for Sonogashira carbonylative reactions

Metal vapour derived supported palladium catalysts for Sonogashira carbonylative reactions

“Silylation-desilylation of propargyl tosylamides: easy sinthesis of a,ß-unsaturated aldehydes and ß-lactams”

“Silylation-desilylation of propargyl tosylamides: easy sinthesis of a,ß-unsaturated aldehydes and ß-lactams”

Nuove vie di sintesi di derivati aldeidici mediante Sililformilazione-Desililazione di acetileni funzionalizzati

Nuove vie di sintesi di derivati aldeidici mediante Sililformilazione-Desililazione di acetileni funzionalizzati

Tris -Ethynylphenyl-amine Fluorophores: Synthesis, Characterisation and Test of Performances in Luminescent Solar Concentrators

ChemistrySelect, Feb 12, 2018

Two fluorescent dyes (CT‐tEPhA=3,3′,3′′‐(nitrilotris(benzene‐4,1‐diyl))tris(1‐(thiophen‐2‐yl)prop... more Two fluorescent dyes (CT‐tEPhA=3,3′,3′′‐(nitrilotris(benzene‐4,1‐diyl))tris(1‐(thiophen‐2‐yl)prop‐2‐yn‐1‐one and T‐tEPhA=tris(4‐(thiophen‐2‐ylethynyl)phenyl)amine) have been synthesised and characterised in different solvents and in a poly(methyl methacrylate) (PMMA) matrix. In both cases, relatively high Stokes shifts (SS) and quantum yields (QY) have been displayed. Notably, CT‐tEPhA based on a mild electron‐attracting carbonyl group coupled with the electron‐donating amino‐centre, shows superior light emitting properties (higher SS, red‐shifted emission, QY > 40%) suggesting application in light harvesting systems. Photocurrent measurements of CT‐tEPhA/PMMA films yield a maximum optical efficiency of 6.32% that is greater than that of fluorophores with same emission window and comparable to that of red‐emitting ones. This efficiency might be improved by extending the push‐pull character of CT‐tEPhA to cover the maximum efficiency of the Si‐based PV cell. Nevertheless, these results clearly support the use of push‐pull fluorophores based on the tris(4‐ethynylphenyl)amine core in solar collectors.

Tris -Ethynylphenyl-amine Fluorophores: Synthesis, Characterisation and Test of Performances in Luminescent Solar Concentrators

ChemistrySelect, Feb 12, 2018

Two fluorescent dyes (CT‐tEPhA=3,3′,3′′‐(nitrilotris(benzene‐4,1‐diyl))tris(1‐(thiophen‐2‐yl)prop... more Two fluorescent dyes (CT‐tEPhA=3,3′,3′′‐(nitrilotris(benzene‐4,1‐diyl))tris(1‐(thiophen‐2‐yl)prop‐2‐yn‐1‐one and T‐tEPhA=tris(4‐(thiophen‐2‐ylethynyl)phenyl)amine) have been synthesised and characterised in different solvents and in a poly(methyl methacrylate) (PMMA) matrix. In both cases, relatively high Stokes shifts (SS) and quantum yields (QY) have been displayed. Notably, CT‐tEPhA based on a mild electron‐attracting carbonyl group coupled with the electron‐donating amino‐centre, shows superior light emitting properties (higher SS, red‐shifted emission, QY > 40%) suggesting application in light harvesting systems. Photocurrent measurements of CT‐tEPhA/PMMA films yield a maximum optical efficiency of 6.32% that is greater than that of fluorophores with same emission window and comparable to that of red‐emitting ones. This efficiency might be improved by extending the push‐pull character of CT‐tEPhA to cover the maximum efficiency of the Si‐based PV cell. Nevertheless, these results clearly support the use of push‐pull fluorophores based on the tris(4‐ethynylphenyl)amine core in solar collectors.

Chemistry: A European Journal, Nov 12, 2020

We report the first observation of circular polarized electroluminescence (CPEL) in thin films of... more We report the first observation of circular polarized electroluminescence (CPEL) in thin films of self-organized oligothiophenes. Four new 1,4-phenylene and 9H-carbazole-based oligothiophenes were ad hoc designed to ensure efficient spontaneous formation of chiral supramolecular order. They were easily synthetized and their chiroptical properties in thin films were measured. Circularly polarized luminescence (CPL) spectra revealed glum in the order of 10 -2 on a wide wavelengths range, originating from their self-organized chiral supramolecular organization. These molecules have reasonable properties as organic semiconductors and for this reason they can constitute the active layer of circularly-polarized organic light-emitting diodes (CP-OLEDs). Thus, we could investigate directly their electroluminescence (EL) and CPEL, without resorting to blends, but rather in a simple multilayer device with basic architecture. This is the first example of a CP-OLED with active layer made only of a small organic compound.

Chemistry: A European Journal, Nov 12, 2020

We report the first observation of circular polarized electroluminescence (CPEL) in thin films of... more We report the first observation of circular polarized electroluminescence (CPEL) in thin films of self-organized oligothiophenes. Four new 1,4-phenylene and 9H-carbazole-based oligothiophenes were ad hoc designed to ensure efficient spontaneous formation of chiral supramolecular order. They were easily synthetized and their chiroptical properties in thin films were measured. Circularly polarized luminescence (CPL) spectra revealed glum in the order of 10 -2 on a wide wavelengths range, originating from their self-organized chiral supramolecular organization. These molecules have reasonable properties as organic semiconductors and for this reason they can constitute the active layer of circularly-polarized organic light-emitting diodes (CP-OLEDs). Thus, we could investigate directly their electroluminescence (EL) and CPEL, without resorting to blends, but rather in a simple multilayer device with basic architecture. This is the first example of a CP-OLED with active layer made only of a small organic compound.

Breaking the symmetry between left-handed and right-handed chiral optical modes in planar Fabry-P... more Breaking the symmetry between left-handed and right-handed chiral optical modes in planar Fabry-Pérot (FP) microcavities would enable a variety of chiral light-matter phenomena, with applications in spintronics, polaritonics, and chiral lasing. Such symmetry breaking, however, has remained underexplored and has been purported to require Faraday mirrors. We present a simple solution to chiral symmetry breaking in FP microcavities, preserving low mode volumes by embedding organic thin films exhibiting "apparent circular dichroism" (ACD); an optical phenomenon based on interfering linear birefringence and linear dichroism with offset optical axes. ACD interactions are opposite for counter-propagating light and increase with path length. Consequently, we demonstrated chiral asymmetry of the cavity modes over an order of magnitude larger than that of the isolated thin film. Through both circular dichroism spectroscopy and simulation using theoretical scattering matrix methods, we characterize the spatial, spectral, and angular chiroptical responses of this new type of chiral microcavity.

Breaking the symmetry between left-handed and right-handed chiral optical modes in planar Fabry-P... more Breaking the symmetry between left-handed and right-handed chiral optical modes in planar Fabry-Pérot (FP) microcavities would enable a variety of chiral light-matter phenomena, with applications in spintronics, polaritonics, and chiral lasing. Such symmetry breaking, however, has remained underexplored and has been purported to require Faraday mirrors. We present a simple solution to chiral symmetry breaking in FP microcavities, preserving low mode volumes by embedding organic thin films exhibiting "apparent circular dichroism" (ACD); an optical phenomenon based on interfering linear birefringence and linear dichroism with offset optical axes. ACD interactions are opposite for counter-propagating light and increase with path length. Consequently, we demonstrated chiral asymmetry of the cavity modes over an order of magnitude larger than that of the isolated thin film. Through both circular dichroism spectroscopy and simulation using theoretical scattering matrix methods, we characterize the spatial, spectral, and angular chiroptical responses of this new type of chiral microcavity.