A5072214729- Liquid Crystal Research Advancements
- Photochromic and Fluorescence Chemistry
- Photochemistry and Electron Transfer Studies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Flame retardant materials and properties
- Synthesis and Properties of Aromatic Compounds
- Porphyrin and Phthalocyanine Chemistry
- Fire dynamics and safety research
- Photonic Crystals and Applications
- Organic Light-Emitting Diodes Research
- Synthesis and Reactions of Organic Compounds
- Magnetism in coordination complexes
- Natural Fiber Reinforced Composites
- Synthesis and biological activity
- Crystal structures of chemical compounds
- Nanocomposite Films for Food Packaging
- Semiconductor Lasers and Optical Devices
- Supramolecular Self-Assembly in Materials
- Synthesis and properties of polymers
- Lanthanide and Transition Metal Complexes
- Innovative concrete reinforcement materials
- Nonlinear Dynamics and Pattern Formation
- Environmental and Industrial Safety
- Luminescence and Fluorescent Materials
Universidade Federal de Santa Catarina
2013-2023
Fundação de Amparo à Pesquisa e Inovação do Estado de Santa Catarina
2019
Centre National de la Recherche Scientifique
2015
Université de Bordeaux
2015
A series of luminescent liquid crystals based on 4,7-diphenylethynyl-2,1,3-benzothiadiazole system was prepared and characterised. The molecules were planned varying number, length position the linear alkoxy/thioalkyl chains. Their mesomorphic properties studied by differential scanning calorimetry, polarised optical microscopy X-ray diffraction. crystalline found to be dependent length, number peripheral alkoxy It observed preferentially smectic C nematic phases whose stability increase...
In this work, six new compound derivatives from thiophene were synthesised. The three symmetrical compounds synthesised containing two heterocyclic 1,2,3-triazole on each side of thiophene, 2,5-disubstituted and the non-symmetrical alkyne groups as a spacer in replacing one these heterocycles. structural modifications made by changing number alkoxy order to understand relation between structure mesomorphic behaviour. Some presented liquid crystalline properties, smectic nematic mesophases....
In this study, eight new compounds derived from thiophene were synthesised and characterised. The four symmetrical contain two heterocyclic 1,2,4- oxadiazole on each side of the 2,5-disubstituted thiophene, non-symmetrical alkyne groups as a spacer replacing one these heterocycles. Some presented liquid crystalline properties with smectic nematic mesophases. low emission blue light.
Five new bent-shaped compounds based on the 2,5-disubstituted thiophene central core were successfully synthesised. The lengths of rigid centres as well degree conjugation varied by coupling benzene, naphthalene and biphenyl systems to through Sonogashira cross-coupling. thermal, mesomorphic optical properties these variants determined. Compounds 5a,b 8a displayed liquid-crystalline smectic nematic mesophases. Strong blue fluorescence was observed for final compounds.
Abstract Prolonged glyoxylation of pyrenyl‐1‐glyoxylic acid ethyl ester leads to a mixture isomers with polar pyrenylene‐1,8‐diglyoxylic as the main product, whereas centrosymmetric 1,6‐isomer is obtained in good yield from corresponding dibromopyrene. Perkin condensations followed by Pd‐catalyzed cyclizations lead isomeric dinaphthopyrene‐tetracarboxdiimides that self‐assemble into columnar liquid crystals hexagonal and rectangular symmetry, which mesophases have unusually elongated unit...
According to the World Health Organization (WHO), cardiovascular diseases (CVDs) are leading cause of mortality and morbidity worldwide. The development electrochemical biosensors for CVD markers detection, such as cardiac troponin I (cTnI), becomes an important diagnostic strategy. Thus, a glassy carbon electrode (GCE) was modified with columnar liquid crystal (LCcol) gold nanoparticles stabilized in polyallylamine hydrochloride (AuNPs-PAH), surface employed evaluate interaction cTnI...
Although the double Friedel-Crafts acylation of arenes with ethyl chloroglyoxylate is hindered by strongly deactivating effect first-entering glyoxylic substituent, reaction successful reactive arene perylene under long times and concomitant ester hydrolysis. The regiospecific, giving 3,9-regioisomer exclusively. This perylenylenediglyoxylic acid condensed first o-bromophenylacetic then α-branched alkylamines to yield title compounds. Whilst corresponding tetraalkyl esters only show...
Speeding up the phosphorescence channel in luminescent copper(I) complexes has been extremely challenging due to copper atoms relatively low spin-orbit coupling constant compared heavier metals such as iridium. Here, we report synthesis and characterization of three mononuclear with diimines, triphenylphosphine, iodide ligands evaluate effect copper-iodide (Cu-I) moiety into decay pathway. Temperature-dependent photophysical studies revealed combined thermally activated delayed fluorescence...
Laterally decorated ribbon-shaped graphene segments made of twelve benzene units self-assemble into a nematic anisotropic glass at room temperature with high birefringence and polarized fluorescence.
The title compound, C(10)H(7)F(3)N(2)O, is an analogue of pyrazolone derivatives with potential analgesic and anti-inflammatory properties. Its mol-ecular structure consists phenyl pyrazol-3(2H)-one units a dihedral angle between the mean planes rings 33.0 (1)°. crystal stabilized by inter-molecular hydrogen bond N-H group carbonyl O atom ring which links mol-ecules into supra-molecular C(5) chains along [001] weak π-π stacking inter-actions [centroid-centroid distance = 3.881 (2) Å]. F...
The crystal structure of the title compound, C(12)H(9)F(3)N(2)O(2), contains two independent mol-ecules in asymmetric unit. are chemically identical but exhibit a significant difference dihedral angles between mean planes phenyl and pyrazole rings, with values 11.62 (13) 18.17 (11)°. Moreover, trifluoro-methyl group one shows rotational disorder F atoms, site occupancy factors 0.929 (6) 0.071 (6). hydroxyl each strong intra-molecular hydrogen bond carbonyl O atom, forming six-membered ring...
Biopacking material was obtained by incorporating tangerine peel extract (Citrus reticulata) in cellulose acetate (CA) film. The film with shown to have a homogeneous characteristic FTIR and DSC analysis, being reinforced MEV MFA, showed absence of pores the extract. These characteristics justify reduced water absorption release CA membrane Low is important for act as barrier external environment sufficient prevent growth strains investigated on sample surface. introduction also tensile...
Two new mesogenic compounds having a bicyclic aromatic thiazolo[5,4-d]thiazole linked to four 1,3,4-oxadiazol heterocycles were synthesised and their liquid-crystalline properties investigated. The exhibit enantiotropic hexagonal columnar mesophase with strong homeotropic orientation induced under confinement, wide range. molecular packing is preserved at room temperature, especially the π-stacking inside columns, which essential for good charge carrier transport. They show high thermal...
Since the first record of discotic liquid crystals (DLCs) by Chandrasekhar et al. in 1977, synthesis and studies these materials have been increased exponentially. They present remarkable charge transport properties including electronic conductivity, thus several devices built based on eletrooptical properties, such as solar cells, active components for image data treatment, among others. Considering above mentioned, two new molecules were synthesized (5 6), which exhibit characteristics...
Electron and hole transport characteristics were evaluated for perylene-based pyrene-based compounds using electron-only hole-only devices. The perylene presented a columnar hexagonal liquid crystal phase at room temperature with strong molecular π-stacking inside the columns. pyrene crystallizes bellow 166 °C, preserving close-packed rectangular structure of mesophase. Photophysical analysis numerical calculations assisted interpretation positive negative charge carrier mobilities obtained...