Synthesis and characterization of luminescent hockey stick‐shaped liquid crystalline compounds

Cristiano, Rodrigo; Vieira, André A.; Ely, Fernando; Gallardo, Hugo

doi:10.1080/02678290500483304

Cited by 98 publications

(24 citation statements)

References 26 publications

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“…In addition, materials with a double bond in the terminal alkyl chain have been synthesised as model monomers for polymeric liquid crystals (22). In this paper, the synthesis and mesomorphic behaviour are reported of a series of novel hockey-stick mesogens based on a naphthalene-2,7-diol central core with a strongly non-symmetrical molecular shape, unlike common bent-shaped liquid crystals based on the same central core (42)(43)(44)(45). The new compounds consist of a five-ring aromatic system connected with ester units of identical orientation.…”

Section: Introductionmentioning

confidence: 98%

“…The nematic, SmC and SmC A were formed in a structurally analogous four-ring system, and the antiferroelectric B2 phase was found in materials possessing polar linking groups in the lengthening arm (44). A bent-core 2,5-disubstituted 1,3,4-oxadiazole served also for design of luminiscent hockey-stick materials exhibiting standard calamitic nematic, smectic A (SmA), SmC and crystalline phases (45).…”

Section: Introductionmentioning

confidence: 99%

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Novel hockey‐stick mesogens with the nematic, synclinic and anticlinic smectic C phase sequence

et al. 2008

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New hockey-stick mesogens have been synthesised and their mesomorphic properties studied. The molecular structure consists of a laterally substituted central naphthalene unit prolonged by two non-symmetrical arms, both of which contain ester units of identical orientation. The shorter arm possesses only one and the longer arm three benzene rings. Nematic, synclinic smectic C and anticlinic smectic C phases were identified and their physical properties studied. No banana-type ordering producing dipolar phases has been found.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Novel hockey‐stick mesogens with the nematic, synclinic and anticlinic smectic C phase sequence

et al. 2008

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“…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%

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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“…However, in 1907 Vorlander proposed a rule that the liquid crystalline state is obtained for the most linear of molecules [3]. Later, an isometric rod like-or disk like-shape molecules used to be a fundamental pre requisite for conventional thermotropic liquid crystal formation because of steric packing considerations play an important role in this interesting state of soft matter [4]. More recently, with the discovery of banana shaped liquid crystals, where bent molecules serve as core, interest in the incorporation of non linear units has gained importance from application point of view [4].…”

Section: Introductionmentioning

confidence: 98%

Dielectric investigation on newly synthesized H-shaped dimer

Dixit

Manohar

Prajapati

et al. 2013

International Conference on Advanced Nanomaterials &Amp; Emerging Engineering Technologies

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sudhaker_dixit@yahoo.co.in Ahstract-The present study reports dielectric study of newly supennolecules i.e. oligomeric and dendritic liquid crystals are synthesized unusual H shaped mesogenic dimer. We have current topics in the field of liquid crystals [8]. Dimeric LC is performed dielectric study with temperature variation in t�e attractive because they exhibit different properties from the frequency range 100 Hz to 40 MHz. The present study IS corresponding low molecular mass mesogens. The transition i�port�nt due to unusual shape of t�ese liquid crystal dimer. T�e properties of the dimeric liquid crystals are known to be dlelectnc results suggest that relaxatIOn mode has been observed In .. MHz region for the sample . For the sample relaxation mode ?ependent on the l�ng�h and panty of th � flexible spacer : �he follows Cole-Cole theory. Relaxation frequency and relaxation Importance of any bqUId crystal has been mcreased by vanatIOn strength have been evaluated from Cole-Cole plot. In addition to on the liquid crystal structure [9, 10]. One of the interesting this, activation energy has also been calculated from Arrhenius plot subfield of liquid crystal design is liquid crystal dimer with showing higher value than other conventional liquid crystal unusual shape as compared to conventional liquid crystal material.structure.

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Synthesis and characterization of luminescent hockey stick‐shaped liquid crystalline compounds

Cited by 98 publications

References 26 publications

Novel hockey‐stick mesogens with the nematic, synclinic and anticlinic smectic C phase sequence

Novel hockey‐stick mesogens with the nematic, synclinic and anticlinic smectic C phase sequence

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

Dielectric investigation on newly synthesized H-shaped dimer

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