622. Mesomorphism and chemical constitution. Part XII. The preparation and mesomorphic properties of substituted 4,4′-di-(p-n-alkoxybenzylideneamino)biphenyls

Branch, Siberian; Byron, D. J.; Gray, G. W.; Ibbotson, A.; Worrall, B. M.

doi:10.1039/jr9640003279

Cited by 21 publications

(6 citation statements)

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“…The angle between the acetyl radical~ and the phenyl ring C(7)-C(12) is 7.9 ° and the angle between the two phenyl rings 49-2 °. The value of 56.4 ° predicted by Branch, Byron, Gray, Ibbotson & Worral (1964), using a simple mathematical treatment on non-sterically affected molecules ro- (Sutherland & Hoy, 1967). (1) C(2) x+ 1, y, z 3.572 C (6) C (1) x+l, y, z 3.654 C (8) C (12) x+l, y, z 3.668 C(9) C(11) x + 1, y, z 3.670 COO) C(9) x+ 1, y, z 3.572 C(12) C(7) x+ 1, y, z 3-615 C (12) O (1) x, y, z+ 1 3.593 C(4) C(3) x+ 1, y, z+ 1 3.617…”

Section: Discussionmentioning

confidence: 99%

The crystal structure of 4-acetyl-2'-chlorobiphenyl

Sutherland¹,

Hoy²

1968

Acta Crystallogr Sect B

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The crystal structure of 4-acetyl-2'-chlorobiphenyl (C14HllOC1) has been determined from threedimensional X-ray diffraction data by a Patterson searching method. The crystals are monoclinic, space group P2~/c, with unit-cell dimensions a= 4.00, b = 38.51, c= 7.52/~, ~= 100"07 o. The structure was refined with use of anisotropic thermal parameters to a residual of 11% for the 883 observed structure factors. The angle between the two phenyl rings was found to be 49"2 °. All the intermolecular contacts correspond to normal van der Waals interactions.

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Section: Discussionmentioning

confidence: 99%

The crystal structure of 4-acetyl-2'-chlorobiphenyl

Sutherland¹,

Hoy²

1968

Acta Crystallogr Sect B

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“…Effect of different substituents on liquid crystalline behaviour of low-molecular mass liquid crystals has been systematically described by Gray [21][22][23] and others. 16,24,25 It is desirable to lower the melting temperature of polymers for processing point of view.…”

Section: Substitution Effectsmentioning

confidence: 99%

“…It can be confirmed by bond lengths of C-H, C-Me and C-Cl are 1.07, 1.54 and 1.76 Å, respectively. 23 Substitution plays important role on mesophase stability. If the substituent is electron-withdrawing group such as chloro may substantially change acidity of the resulting polyesters.…”

Section: Substitution Effectsmentioning

confidence: 99%

Thermotropic liquid crystalline polyesters derived from 2-chloro hydroquinone

Manurkar

Mulani

et al. 2017

J Chem Sci

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Synthesis of thermotropic liquid crystalline polyesters derived from bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene (BHBOCB) and aliphatic dicarboxylic acid chlorides by interfacial polycondensation methodology is presented. Synthesised polyesters consist of bis[4-hydroxy benzoyloxy]-2-chloro-1,4-benzene as a mesogen and aliphatic diacid chloride as flexible spacer. The length of oligomethylene units in the polymer was varied from the trimethylene to the dodecamethylene groups. Synthesized polyesters were characterized by differential scanning calorimetry and optical microscopy. The transition temperatures and thermodynamic properties were studied for all these polymers. These polyesters exhibited thermotropic liquid crystalline behavior and showed nematic texture except decamethylene spacer. Decamethylene spacer based polyester showed marble texture of smectic C. Mesophase stability of these polyesters was higher than 123 • C (except first heating cycle of PE-1).

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“…The liquid crystalline behaviour of low-molecular mass liquid crystals with different substituents on mesogenic units has been systematically studied by Gray 23,24 and others. [25][26][27] In general, the influence of substitution is complicated by both steric and polar effects. The steric effect, which leads to a less thermally stable mesophase, may involve in following contribution: (i) a broadening of the mesogenic groups by the substituent and therefore, a decrease in the overall length to diameter ratio; (ii) a decrease in the coplanarity of adjacent mesogenic moieties due to steric interaction between substituents and (iii) a tendency for the substituent to force apart mesogenic groups in neighbouring polymer chains due to spatial requirements.…”

Section: Substitution Effectmentioning

confidence: 99%

Thermotropic liquid crystalline polyesters derived from bis-(4-hydroxybenzoyloxy)-2-methyl-1,4-benzene and aliphatic dicarboxylic acid chlorides

et al. 2015

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A series of thermotropic liquid crystalline polyesters derived from bis-(4-hydroxybenzoyloxy)-2methyl-1,4-benzene (BHBOMB) and aliphatic dicarboxylic acid chlorides were investigated. All these polyesters were synthesized by interfacial polycondensation method and characterized by differential scanning calorimetry and wide-angle X-ray diffractometer. These polyesters consist of BHBOMB as a mesogenic diol and aliphatic diacid chlorides were used as flexible spacers. The length of oligomethylene units in polymer was varied from the trimethylene to the dodecamethylene groups. The transition temperatures and thermodynamic properties were studied for all these polymers. All these polyesters were soluble in chlorinated solvents such as chloroform, dichloromethane, dichloroethane, etc. More importantly, all these polyesters exhibited very large mesophase stability.

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622. Mesomorphism and chemical constitution. Part XII. The preparation and mesomorphic properties of substituted 4,4′-di-(p-n-alkoxybenzylideneamino)biphenyls

Cited by 21 publications

References 0 publications

The crystal structure of 4-acetyl-2'-chlorobiphenyl

The crystal structure of 4-acetyl-2'-chlorobiphenyl

Thermotropic liquid crystalline polyesters derived from 2-chloro hydroquinone

Thermotropic liquid crystalline polyesters derived from bis-(4-hydroxybenzoyloxy)-2-methyl-1,4-benzene and aliphatic dicarboxylic acid chlorides

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