Morphology directing synthesis of 1-pyrene carboxaldehyde microstructures and their photo physical properties

Experimental and computational thermodynamics of pyrene and 1-pyrenecarboxaldehyde and their photophysical properties

“…This is in agreement with results reported by Bhattacharjee et al [23]. Sahoo and collaborators also referred emission spectra of 1-pyrenecarboxaldehyde, at different concentrations, (5 Á 10 À3 and 1 Á 10 À6 ) mol Á L À1 in ethanol, with maximum emission at, respectively, (470 and 440) nm [74]. This demonstrates a slight variation of the emission wavelength with the concentration which was not found in our study.…”

“…The effect of the dipole-dipole interaction due to the polarity of the molecule causes a decrease of the distance between two molecules of 1-pyrenecarboxaldehyde, comparing with pyrene and, consequently, a larger stabilization in crystalline phase [55]. In the gaseous phase, computational calculations performed by Sahoo and collaborators [74] confirm that the dipole-dipole interactions are larger in 1-pyrenecarboxaldehyde than in pyrene. In our opinion, the larger stability of 1-pyrenecarboxaldehyde is reinforced by the formation of an intramolecular hydrogen bond between the carbonyl oxygen atom and H atom of the carbon in the 10-position (C@OÁ Á ÁH).…”

“…The solid-state fluorescence of organic materials strongly depends on the molecular structure, crystal lattice, stacking modes and intermolecular electronic interactions present in molecules, exerting a great influence on the optical properties of luminescent materials [86][87][88][89]. The differences in the solid-state U F values should be attributed to the stronger pÀp stacking interactions in 1-pyrenecarboxaldehyde than in pyrene, caused by the added polarity of the aldehyde derivative, which is responsible for the shorter distance between two neighbouring molecules, when compared to pyrene [55,74]. In contrast, weaker pÀp interactions appear to yield blue-emissive solids.…”

Morphology directing synthesis of benzo[a]pyrene microstructures and their photo physical properties

“…These include zero dimensional (0-D) spherical or tetrahedral quantum dots [16,17], one-dimensional (1-D) nano rods and wires from small organic compound [18][19][20] and two-dimensional (2-D) nanoplates [21], nanoribbons and nanotubes [22], microcapsule [23], organic nano flower [24], sub-microtube [25], etc. Various techniques were developed to prepare organic nano/ micro particle, such as reprecipitation [26], physical vapor deposition [27], microemultion [28], ultra-sonication [29], template method [30], self-organization [31], postchemistry [32][33][34][35], etc. Molecular beam deposition method [36] and laser ablation method [37] are also available for the preparation of organic nanoparticles.…”

Morphology directing synthesis of 1-aminopyrene microstructures and its super quenching effect towards nitro aromatics

“…3 flowers [26], sub-microtubes [27], rod, bar and plates [28] etc. Organic nano/ micro particles are synthesized either top-down or bottom-up approach.…”