Non‐symmetrical luminescent 1,2,4‐oxadiazole‐based liquid crystals

Gallardo, Hugo; Cristiano, Rodrigo; Vieira, André A.; Filho, Ricardo A. W. Neves; Srivastava, Rajendra M.; Bechtold, Ivan H.

doi:10.1080/02678290802243117

Cited by 58 publications

(15 citation statements)

References 18 publications

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“…According with our earlier publications, the melting point of compound 2a is 105°C, while 2c is 86°C [22]. With both optimized structures in our hands, we can assume that the melting point decrease in 2c is due to the non-coplanar arrangement between ring C and the -NO2 group.…”

Section: Geometry Optimizationmentioning

confidence: 95%

“…The foregoing observations for such compounds are particularly noteworthy, and we have already devoted efforts in synthesizing and characterizing thermally stable luminescent liquid crystals possessing 1,2,3-triazole [17], 2,1,3-benzothiadiazole [18], isoxazole [19], and 1,2,4-or 1,3,4-oxadiazole moiety in their molecular frameworks [20][21][22][23].…”

Section: Introductionmentioning

confidence: 95%

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Complete 1H and 13C NMR signal assignments and chemical shift calculations of four 1,2,4-oxadiazole-based light-emitting liquid crystals

et al. 2010

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In this article, we describe the complete 1 H and 13 C NMR signal assignments of four 1,2,4-oxadiazoles possessing light-emitting liquid crystal properties. These results were obtained by using one-and two-dimensional NMR techniques as well as GIAO (PCM) calculations at B3LYP/6-311??G(d,p) level for compounds 1 and 2a-d.The computed values are in good agreement with the ones obtained experimentally. In addition, some previously unexplained thermotropic features of compounds 2a-d could be clarified with the help of the geometry optimization calculations carried out by us.

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Section: Geometry Optimizationmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 95%

Complete 1H and 13C NMR signal assignments and chemical shift calculations of four 1,2,4-oxadiazole-based light-emitting liquid crystals

et al. 2010

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“…Here, the two arms differ to a great extent with regard to their lengths. [1][2][3][4][5][6][7][8][9][10][11] Generally, the hockey stick mesogens exhibit smectic and nematic mesophases. Interestingly, in some of the cases, the occurrence of two polymorphic tilted smectic phases i.e., SmC s and SmC a , are observed.…”

Section: Introductionmentioning

confidence: 99%

Hockey stick-shaped azo compounds: effect of linkage groups and their direction of linking on mesomorphic properties

2015

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Several new hockey stick-shaped azo compounds are designed and synthesised with an aim to study the effect of different types of linkages and their direction of linking on the mesomorphic properties in such systems. The new compounds synthesised are characterised by spectroscopic methods. The liquid crystalline properties are investigated using polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) studies. They exhibited a variety of mesophases such as nematic (N), smectic A (SmA), anticlinic smectic C (SmC a ), B 1 , etc. We found that the direction of linkage groups has a major effect on the mesomorphic properties when compared to the effect of different types of linkage groups. We observed a reversible photoswitching phenomenon of these compounds in their solution UV-vis spectra.

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“…for molecules which absorb light with an electric field only along a particular molecular direction and with strong emission in the visible range. Among such materials, anthraquinone, naphthalimide [23,24], acenequinone [25], oligothiophenes [26,27], benzothiadiazole [28][29][30], perylene [31,32], cyanine derivatives [33], pyrene [34][35][36], oxadiazole [37][38][39] and BODIPY-dyes [40,41] belong to those * Corresponding author. Email: Jiri.Svoboda@vscht.cz that have been most intensively studied.…”

Section: Introductionmentioning

confidence: 99%

[2]Benzothiophene bent-shaped liquid crystals

et al. 2010

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New liquid crystalline (LC) compounds containing the [2]benzothiophene chromophore unit have been synthesised and their mesomorphic properties studied. Mesomorphic and fluorescent properties have been modified by various chemical moieties. Among others, terminal fluoroalkyl and/or chiral chains were introduced to stabilise mesophases and support the formation of polar phases. In spite of the bent shape due to the central 1,3-diphenylbenzo[c]thiophene unit, all compounds exhibit phases typical for the rod-like LC: nematic, smectic A and smectic C or their chiral analogues using the chiral (S)-C 2 H 5 CH(CH 3 )(CH 2 ) 6 CO or (S)-C 10 H 21 OCH(CH 3 )CO chain. The orientational order in the nematic phase was studied by polarised infrared measurements. The fluorescent properties of the studied compounds have been measured and their parameters established.

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Non‐symmetrical luminescent 1,2,4‐oxadiazole‐based liquid crystals

Cited by 58 publications

References 18 publications

Complete 1H and 13C NMR signal assignments and chemical shift calculations of four 1,2,4-oxadiazole-based light-emitting liquid crystals

Complete 1H and 13C NMR signal assignments and chemical shift calculations of four 1,2,4-oxadiazole-based light-emitting liquid crystals

Hockey stick-shaped azo compounds: effect of linkage groups and their direction of linking on mesomorphic properties

[2]Benzothiophene bent-shaped liquid crystals

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