Blue Glow Sticks: Cinnamic Acids and Arylacrylonitriles with Liquid-Crystalline Properties and Highly Fluorescent

Tavares, Aline; Costa, Rebeca O.; Weber, Cristiane Seganfredo; Cazati, Thiago; Ceschi, Marco Antonio; Vieira, André A.; Merlo, Aloir A.

doi:10.21577/0103-5053.20200159

Cited by 3 publications

(2 citation statements)

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“…Polycyclic aromatic hydrocarbons such as naphthalene, anthracene and pyrene have been widely used in the development of functional materials with intense emission and unique charge transport properties. Incorporation of these chromophores in molecular materials facilitates π–π stacking and enhances charge migration improving the optical properties, due to the planar and rigid architecture of these segments [ 36 , 37 , 38 , 39 , 40 , 41 ]. Current interest in liquid crystalline dimers containing diether linked spacers with different lengths and parities, and π-conjugated mesogenic arm structures that tend to induce twist-bend nematic phases and nematic glassy states, was shown in [ 39 , 40 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

Mesomorphic Behavior of Symmetric Azomethine Dimers Containing Different Chromophore Groups

Perju

Marin

2021

Molecules

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A series of new azomethine dimers was synthesized by the condensation reaction of flexible bis-benzaldehydes with four aromatic amines containing phenyl, naphthyl, anthracene and pyrene groups. Their right structure was confirmed by FTIR and 1H-NMR spectroscopy and their thermal properties were investigated by thermogravimetric analysis, differential scanning calorimetry and polarized light optical microscopy. A view on their photophysical behavior was gained by UV-vis and photoluminescence spectroscopy. The dimers containing pyrene and anthracene presented liquid crystalline behavior, while the other dimers were crystalline compounds. Two dimers containing pyrene moieties formed mesomorphic glasses and had intense luminescence, promising properties for applications in building optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Mesomorphic Behavior of Symmetric Azomethine Dimers Containing Different Chromophore Groups

Perju

Marin

2021

Molecules

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“…A perusal of literature revealed that of many known transition metal hydroxamate complexes [31], there are sporadic reports on vanadium-hydroxamate complexes [32][33]. The ligand potassium 4nitrocinnamohydroxamate has been selected owing to the biological and pharmacological (antioxidant, anxiolytic, insect repellent, antidiabetic, anticholesterolemic), fluorescent properties shown by cinnamic acid derivatives [34][35][36][37]. Thus, in continuation of our research interest in vanadium chemistry [38][39][40][41][42][43][44][45][46][47][48], a vanadium complex [VO(4-NO 2 C 6 H 4 CH=CHCONHO) 2 ], 1 has been synthesized and thoroughly characterized by spectroscopic techniques.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Biological Activity of Oxidovanadium(IV) Hydroxamate Complexes Supported by Density Functional Theory

Sharma¹,

Das

Sadhu³

et al. 2021

Preprint

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The oxidovanadium(IV) complex [VO(HL)2] (1) (where, HL = 4-nitrocinnamohydroxamate; 4-NO2C6H4CH=CHCONHOH) has been synthesized by the condensation reaction of VOSO4∙5H2O and potassium 4-nitrocinnamohydroxamate in methanol-water medium. The complex is characterized by elemental analysis, molar conductivity, magnetic susceptibility measurement, FTIR, UV-Vis, Electron Paramagnetic Resonance (EPR) spectral techniques and mass spectrometry. The bidentate linkage of hydroxamate ligand involving O,O-coordination through hydroxamic and carbonyl oxygen atoms has been deduced. The magnetic susceptibility, EPR and mass spectra (ESI-MS) indicate that the complex exists as monomer and a distorted square pyramidal geometry around vanadium is proposed. The electrochemical study of 1 has shown it is to be electrochemically active exhibiting VOV/VOIV quasi-reversible redox couple. The thermal study of the complex yielded VO2 as sole decomposition product. The coordination compounds 2 and 3 have been isolated from the reaction of complex 1 with 2-cyanopyridine (2-CNPy) and 4-aminobenzonitrile (4-CNAn) respectively and characterized by physicochemical and IR spectral study. The biological activity of 1-3 has been studied against various pathogenic bacteria E. coli, S. aureus, S. typhi, S. paratyphi, S. epidermidis, K. pneumonia and fungi C. albicans, B. fulva, and F. oxysporum by minimum inhibitory concentration (MIC) method. The complexes exhibit enhanced antimicrobial activity relative to both the free ligand and vanadyl sulphate. The cytotoxicity of 1-3 has been studied on mammalian transformed cell line Hep2c, a derivative of human cervix carcinoma HeLa cells by MTT assay. 2 and 3 exhibit higher cytotoxic activity than 1 and reveal a marked effect of the coordination of nitrogen bases. Density functional theory studies have been carried out to determine the relative free energy of formation and stable molecular structures of 1-3. Time dependent density functional theory (TD-DFT) based calculation have been performed to find out the frontier molecular orbitals and to corroborate with the experimentally observed UV-Vis spectrum of 1. Other parameters like HOMO, and LUMO energies, density of state (DOS), and global reactivity descriptors clearly support higher biological activity of 2 and 3 than 1.

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Cinnamic acid and biphenyl core calamitic asymmetric molecules: preparation and characterization for mesomorphic properties

Srinivasa,

Hariprasad

2024

Phase Transitions

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Blue Glow Sticks: Cinnamic Acids and Arylacrylonitriles with Liquid-Crystalline Properties and Highly Fluorescent

Cited by 3 publications

References 0 publications

Mesomorphic Behavior of Symmetric Azomethine Dimers Containing Different Chromophore Groups

Mesomorphic Behavior of Symmetric Azomethine Dimers Containing Different Chromophore Groups

Synthesis, Characterization, and Biological Activity of Oxidovanadium(IV) Hydroxamate Complexes Supported by Density Functional Theory

Cinnamic acid and biphenyl core calamitic asymmetric molecules: preparation and characterization for mesomorphic properties

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