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Journal articles on the topic 'Mesomorphic phase'

Author: Grafiati

Published: 18 May 2024

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1

Ha, Sie-Tiong, and Teck-Leong Lee. "Synthesis and Mesomorphic Properties of New Fluorinated Schiff Base Liquid Crystals." ISRN Materials Science 2014 (January 16, 2014): 1–7. http://dx.doi.org/10.1155/2014/904657.

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Two new compounds, 4-alkanoyloxybenzylidene-4′-fluoroaniline and 4-fluorobenzylidene-4′-n-alkanoyloxyaniline comprising a terminal fluorosubstituent were studied. The fluoro substituent contributes to the molecular polarizability, thus affecting intermolecular interactions and hence resulting in smectic mesomorphism. The mesomorphic properties were studied using differential scanning calorimetry and polarizing optical microscopy techniques. The mesomorphic properties of compounds studied are strongly dependent on the orientation of the imine (CH=N) linkage. The former Schiff base exhibited sme

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2

Mirnaya, T. A., G. G. Yaremchuk, and S. V. Volkov. "Phase Diagrams of Binary Systems of Some Alkali Propionates." Zeitschrift für Naturforschung A 48, no. 10 (1993): 995–99. http://dx.doi.org/10.1515/zna-1993-1006.

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Abstract The phase diagrams of the binary systems sodium-potassium, sodium-caesium, and potassium-caesium propionates have been investigated by differential thermal analysis and hot-stage polarization microscopy. Smectic liquid crystals in the systems with sodium propionate have been discovered. Liquid crystal formation in binaries of two non-mesomorphic components is explained by latent mesomorphism which is shown to be inherent to both sodium and potassium propionate.

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3

Sharma, Vinay S., and R. B. Patel. "Synthesis of Liquid Crystals with Substituents in Terminal Benzene Cores and their Mesomorphic Behaviour." International Letters of Chemistry, Physics and Astronomy 58 (September 2015): 144–53. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.58.144.

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A new homologous series consisting of thirteen homologues central ester and chalcone linkage with Pentyloxy side chain at terminal benzene ring is synthesized and their mesomorphic properties are studied, with the exception of the methyl, ethyl and propyl homologues. However, the rest of homologues show mesomorphism enantiotropically manner with exhibition of nematic phase. The texture image of the nematic mesophases is observed by optical polarizing microscope equipped with heating stage (POM) is threaded or Schlieren type. An odd-even effect is observed in the nematic-isotropic curve with al

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4

Sharma, Vinay S., and R. B. Patel. "Synthesis of Liquid Crystals with Substituents in Terminal Benzene Cores and their Mesomorphic Behaviour." International Letters of Chemistry, Physics and Astronomy 58 (September 2, 2015): 144–53. http://dx.doi.org/10.56431/p-9j6csf.

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A new homologous series consisting of thirteen homologues central ester and chalcone linkage with Pentyloxy side chain at terminal benzene ring is synthesized and their mesomorphic properties are studied, with the exception of the methyl, ethyl and propyl homologues. However, the rest of homologues show mesomorphism enantiotropically manner with exhibition of nematic phase. The texture image of the nematic mesophases is observed by optical polarizing microscope equipped with heating stage (POM) is threaded or Schlieren type. An odd-even effect is observed in the nematic-isotropic curve with al

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5

Bhola, G. N., and Umed C. Bhoya. "Mesomorphism Dependence on Cis-Trans Configuration and Varying Terminal/Lateral Group." International Letters of Chemistry, Physics and Astronomy 65 (April 2016): 71–79. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.65.71.

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A chalconyl trans vinyl ester homologous series of thermotropic liquid crystals RO-C6H4-CH=CH-COO-C6H4-CH=CH-CO-C6H3(OCH3)2meta-para is synthesized and studied with a view to understand and establish the relation between molecular structure and mesomorphism or mesomorphic behaviors. Novel homologous series consists of thirteen homologues (C1to C18). First five (C1to C5) homologues are nonmesogenic. Rest of the homologues (C6to C18) homologues is mesogenic. Monotropically smectogenic character appears from C6to C10homologue and C12to C18homologues are enantiotropically smectogenic. Nematogenic

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6

KONISHI, TAKASHI, and YOSHIHISA MIYAMOTO. "Polymer Crystallization through Mesomorphic Phase." Sen'i Gakkaishi 75, no. 2 (2019): P—103—P—107. http://dx.doi.org/10.2115/fiber.75.p-103.

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7

NISHIDA, KOJI, TAKASHI KONISHI, and TOSHIJI KANAYA. "Mesomorphic Phase in Crystalline Polymer." FIBER 63, no. 12 (2007): P.412—P.416. http://dx.doi.org/10.2115/fiber.63.p_412.

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8

MORIYA, Keiichi, Yasuyuki KAWANISHI, Toshiya SUZUKI, Shinichi YANO, and Meisetsu KAJIWARA. "Mesomorphic Phase Transition in Organophosphazenes." KOBUNSHI RONBUNSHU 56, no. 6 (1999): 390–95. http://dx.doi.org/10.1295/koron.56.390.

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9

Maheta, S. A., G. N. Bhola, and Umed C. Bhoya. "Dependence of Liquid Crystalline Behaviors on Molecular Flexibility." International Letters of Chemistry, Physics and Astronomy 47 (February 2015): 77–86. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.47.77.

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A novel homologous series of thermotropic liquid crystal (LC) has been synthesized with a view to understand and establish the effect of molecular structure on liquid crystal behaviors of a series. The present LC series consist of twelve homologues (C1 to C16); whose mesomorphic properties commence from octyloxy (C8) homologue of a series. C8, C10 and C12 members of a series are monotropic smectic and C14, C16 members are enantiotropically smectogenic. C1 to C7 homologues are nonmesomorphic. Nematogenic property is totally absent. Transition and melting temperatures are determined by an optica

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10

Maheta, S. A., G. N. Bhola, and Umed C. Bhoya. "Dependence of Liquid Crystalline Behaviors on Molecular Flexibility." International Letters of Chemistry, Physics and Astronomy 47 (February 24, 2015): 77–86. http://dx.doi.org/10.56431/p-88a000.

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A novel homologous series of thermotropic liquid crystal (LC) has been synthesized with a view to understand and establish the effect of molecular structure on liquid crystal behaviors of a series. The present LC series consist of twelve homologues (C1 to C16); whose mesomorphic properties commence from octyloxy (C8) homologue of a series. C8, C10 and C12 members of a series are monotropic smectic and C14, C16 members are enantiotropically smectogenic. C1 to C7 homologues are nonmesomorphic. Nematogenic property is totally absent. Transition and melting temperatures are determined by an optica

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11

Bhola, G. N., and Umed C. Bhoya. "Mesomorphism Dependence on Cis-Trans Configuration and Varying Terminal/Lateral Group." International Letters of Chemistry, Physics and Astronomy 65 (April 6, 2016): 71–79. http://dx.doi.org/10.56431/p-9v83m3.

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A chalconyl trans vinyl ester homologous series of thermotropic liquid crystals RO-C6H4-CH=CH-COO-C6H4-CH=CH-CO-C6H3 (OCH3)2 meta-para is synthesized and studied with a view to understand and establish the relation between molecular structure and mesomorphism or mesomorphic behaviors. Novel homologous series consists of thirteen homologues (C1 to C18). First five (C1 to C5) homologues are nonmesogenic. Rest of the homologues (C6 to C18) homologues is mesogenic. Monotropically smectogenic character appears from C6 to C10 homologue and C12 to C18 homologues are enantiotropically smectogenic. Nem

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12

Mirnaya, T. A., V. S. Dradrah, and G. G. Yaremchuk. "Mesophase and Glass Formation in Binary Systems of Caesium and Alkali-Earth Metal Butyrates." Zeitschrift für Naturforschung A 54, no. 12 (1999): 685–88. http://dx.doi.org/10.1515/zna-1999-1204.

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Abstract The phase diagrams of the binary systems of non-mesomorphic components such as caesium-mag-nesium, caesium-calcium and caesium-barium butyrates have been studied by differential thermal analysis and hot stage polarization microscopy. Smectic liquid crystals are found in some composition ranges of the binaries with calcium and barium butyrates. The liquid crystal appearance in these systems is explained by the exhibition of latent mesomorphism of caesium butyrate. Glasses are obtained in all systems studied, the formation of vitreous optical anisotropic mesophase being revealed only fo

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13

Kłosowicz, Stanisław, Jerzy Zieliński, and Zbigniew Raszewski. "Mesomorphic state and types of mesophases." Bulletin of the Military University of Technology 71, no. 1 (2022): 115–35. http://dx.doi.org/10.5604/01.3001.0016.1478.

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The paper presents basic types of liquid-crystalline phases obtained in different ways and supermolecular arrangement in those phases. Characteristic features of molecular structure of mesogens are discussed, moreover their influence on liquid-crystalline properties are described too. Examples of the effect of intermolecular interactions on the phase situation of a liquid crystal are given. Keywords: liquid crystals, mesophases, polymorphism, mesogens, molecular structure

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14

Nishida, Koji, and Harutoshi Asakawa. "Mesomorphic Phase of Isotactic Polypropylene ―Part2―." Seikei-Kakou 23, no. 7 (2011): 418–20. http://dx.doi.org/10.4325/seikeikakou.23.418.

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15

Caffrey, Martin. "A lipid mesomorphic phase data compilation." BioEssays 5, no. 4 (1986): 184. http://dx.doi.org/10.1002/bies.950050412.

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16

Cheng, Rui, Wen Guang Wang, Teng Zhou Yang, Yu Jiang, and Jia Ling Pu. "Mesomorphism of Hexa-Peri-Hexabenzocoronene Discotic Liquid Crystals with Odd-Carbon Alkyl Chains." Advanced Materials Research 554-556 (July 2012): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.43.

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A new HBC derivative HBC-C17containing 6 odd-carbon alkyl chains surrounding the hexabenzocoronene core was synthesized, and investigated as discotic liquid crystal along with HBC-C13and HBC-C15. The thermal behaviors have been investigated by using differential scanning calorimetry (DSC). And mesomorphic phase behavior of HBC-C17was observed by polarizing optical microscopy (POM). A remarkable variation in the phase transition temperatures was observed for these three HBC derivatives (HBC-C13, HBC-C15and HBC-C17). Moreover, the mesomorphism of these HBC derivatives can be compared with HBC-C1

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17

Ha, S. T., and Y. W. Low. "Synthesis and Phase Transition Behaviours of New Chalcone Derivatives." Journal of Chemistry 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/943723.

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A series of new chalcone derivatives with a general formula of C11H27COOC6H4COCH=CHC6H4X where X=F, Cl, Br, and NO2were well synthesized and crystallized from organic solution. The physical properties as well as the chemical formulations of these compounds were determined by spectroscopic techniques (FTIR, and1H and13C NMR). Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) techniques were employed to study their transition temperatures and mesophase characteristics. DSC thermograms of compounds with fluoro and nitro substituents displayed direct isotropization an

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18

Sun, Sha, Wen Cai Xu, Chun Xiu Zhang, and Shi Yong Luo. "Synthesis and Phase Behavior of 4, 4’-Azobisphenol Derivatives." Advanced Materials Research 380 (November 2011): 316–19. http://dx.doi.org/10.4028/www.scientific.net/amr.380.316.

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In this paper, 4, 4’-Azobisphenol was synthesized with three methods which were high temperature reduction, Pb-reduction and diazotize-coupling, and diazotize-coupling was the best way. 4, 4’-Azobisphenol derivatives-1, 2- bis(4-(alloxy/hexyloxy)phenyl) diazene were synthesized through etherification. The structures of these compounds were characterized by the methods of 1H-NMR and FTIR. Phase-transition temperature was measured by DSC, and the phase behaviors were studied by the polarizing microscope. In those derivatives, only1, 2- bis(4-(hexyloxy)phenyl) diazene had mesomorphic phase and mo

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19

Parra, M., Sh Villouta, V. Vera, J. Belmar, C. Zúñiga, and H. Zunza. "Synthesis and Mesomorphic Properties of Azo Compounds Derived from Phenyl-and Thienyl-1,3,4-Thiadiazole." Zeitschrift für Naturforschung B 52, no. 12 (1997): 1533–38. http://dx.doi.org/10.1515/znb-1997-1215.

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The synthesis and mesomorphic behaviour of new series of liquid crystals containing 1,3,4- thiadiazole and thiophene rings with azo central bond are reported (series 5a and 5b). All compounds of series 5a exhibit enantiotropic nematic mesophase and the higher homologues (n = 9 - 10) also show a monotropic smectic C phase. Series 5b show dimorphism SC - N (for n = 5 - 7 the SC is monotropic). These series are compared with the Schiff’s bases analogues, the imine bond gives rise to similar liquid crystals phase but larger mesomorphic range.

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20

Solanki, Ravindra, and R. B. Patel. "Study of Mesomorphism Changing on Terminal Side Chain with Different Thioalkyl Group." International Letters of Chemistry, Physics and Astronomy 60 (September 2015): 142–51. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.60.142.

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A novel mesomorphic series is RS-C6H4-COO-C6H4-CO-CH=CH-C6H4-OC18H37(n) (para) of chalconyl ester play double role thermotropic as well as lyotropically bioactive is synthesized and studied with a view to understand and establish the effect on mesomorphism when changing on left thioalkyl chain.the relation between mesomorphism and molecular structure on the basis of molecular rigidity and flex Novel series consists of thirteen homologues of which four homologues (C1 to C3) are non liquid crystal and the rest of the homologues (C5 to C18) are thermotropically enantiotropic nematic absences with

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21

Solanki, Ravindra, and R. B. Patel. "Study of Mesomorphism Changing on Terminal Side Chain with Different Thioalkyl Group." International Letters of Chemistry, Physics and Astronomy 60 (September 30, 2015): 142–51. http://dx.doi.org/10.56431/p-8444j2.

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A novel mesomorphic series is RS-C6H4-COO-C6H4-CO-CH=CH-C6H4-OC18H37(n) (para) of chalconyl ester play double role thermotropic as well as lyotropically bioactive is synthesized and studied with a view to understand and establish the effect on mesomorphism when changing on left thioalkyl chain.the relation between mesomorphism and molecular structure on the basis of molecular rigidity and flex Novel series consists of thirteen homologues of which four homologues (C1 to C3) are non liquid crystal and the rest of the homologues (C5 to C18) are thermotropically enantiotropic nematic absences with

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22

Ong, L. K., and S. T. Ha. "Influence of Linking Group Orientation on Mesomorphism of Two Aromatic Ring Mesogens." Journal of Chemistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/864819.

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A new homologous series of alkyl 4-{[(4-chlorophenyl)imino]methyl}benzoates were prepared, and all the members are differentiate by the alkoxy chain length,CnH2n+1O, wheren=2–7, 9, 11, 13, 15. Their phase transition behaviors and mesophase characteristics were studied by differential scanning calorimetry (DSC) and optical polarizing microscopy techniques. DSC thermograms show direct isotropization and recrystallization during heating and cooling processes, respectively. The crystal phase changed directly to dark area textures (isotropic phase) without displaying any mesophase. The mesomorphic

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23

Fabre, P., C. Casagrande, M. Veyssie, V. Cabuil, and R. Massart. "Ferrosmectics: A new magnetic and mesomorphic phase." Physical Review Letters 64, no. 5 (1990): 539–42. http://dx.doi.org/10.1103/physrevlett.64.539.

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24

Lansac, Y., F. Fried, and P. Maïssa. "Dynamics of phase separation in mesomorphic mixtures." Liquid Crystals 18, no. 6 (1995): 829–37. http://dx.doi.org/10.1080/02678299508036699.

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25

Wang, Zhi-Gang, Benjamin S. Hsiao, Srivatsan Srinivas, et al. "Phase transformation in quenched mesomorphic isotactic polypropylene." Polymer 42, no. 18 (2001): 7561–66. http://dx.doi.org/10.1016/s0032-3861(01)00286-5.

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26

Konishi, Takashi, Koji Nishida, Go Matsuba, and Toshiji Kanaya. "Mesomorphic Phase of Poly(butylene-2,6-naphthalate)." Macromolecules 41, no. 9 (2008): 3157–61. http://dx.doi.org/10.1021/ma702383b.

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27

Kutsumizu, Shoichi, Minoru Yamada, and Shinichi Yano. "Mesomorphic phase transitions of a series of D-phase compounds." Liquid Crystals 16, no. 6 (1994): 1109–13. http://dx.doi.org/10.1080/02678299408027881.

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28

Yao, Dan Shu, Jun He, Guo Hua Li, Qian Xu, Ying Gang Jia, and Fan Bao Meng. "Synthesis and Mesomorphism of Novel Star-Shaped Liquid Crystals Containing Donor-Acceptor Groups." Applied Mechanics and Materials 395-396 (September 2013): 72–75. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.72.

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A new class of three-armed star-shaped liquid crystals 5a-5d were synthesized, they used 1,3,5-trihydroxybenzene as a core, ω-[4-(p-ethoxybenzoloxy) phenoxycarbonyalkyl acid (3a, 3b) and ω-[4-(p-nitrobenzoloxy) phenoxycarbonyalkyl acid (3c, 3d) as mesogenic arms. Their chemical structures were confirmed by FTIR and 1H NMR spectra. The mesomorphic properties and phase behavior were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and thermogravimetric analyzer (TG) measurements. The results showed that the three-armed star-shaped liquid crystals exhib

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29

Kovářová, Anna, Svatopluk Světlík, Václav Kozmík, et al. "Unusual polymorphism in new bent-shaped liquid crystals based on biphenyl as a central molecular core." Beilstein Journal of Organic Chemistry 10 (April 7, 2014): 794–807. http://dx.doi.org/10.3762/bjoc.10.75.

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Bent-shaped mesogens possessing a biphenyl as a central core have been synthesized and the role of the terminal chain and the orientation of the ester as a linkage group have been investigated. For the studied molecular core we have established that both parameters play an important role for the mesomorphic properties. The polyfluoroalkyl terminal chain supports the formation of mesophases, and the introduction of a chiral lactate terminal chain destabilizes mesophases for the first type of mutual orientation of ester groups, attached to the central core. On the contrary, for the opposite orie

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30

Aguilera, C., M. Parra та G. Fuentes. "Synthesis and Mesomorphic Properties of Polymethylene-α,ω–bis [2-thio- 5-(4',4"n-alcoxybenzoyIoxy)phenyl]-1,3,4-oxadiazole". Zeitschrift für Naturforschung B 53, № 3 (1998): 367–70. http://dx.doi.org/10.1515/znb-1998-0316.

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Abstract Three homologous series of polymethylene-α,ω-bis[2-thio-5(4′,4″n-alkoxybenzoyloxy)- phenyl]-1,3,4-oxadiazole (series 5 a, b, c), are reported.The compounds have identical mesogenic units at both ends of a spacer (i.e. they are twins). These twins possess a spacer of 6, 8 and 10 carbon atoms joined directly to the oxadiazole ring through sulphur atoms. The lateral alkylic chains vary between 6 and 10 carbon atoms.The presence of enantiotropic and monotropic nematic phase is related to the length of the spacer group. The influence of molecular structure on the mesomorphic properties has

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31

Altowyan, Abeer S., Hoda A. Ahmed, Sobhi M. Gomha, and Ayman M. Mostafa. "Optical and Thermal Investigations of New Schiff Base/Ester Systems in Pure and Mixed States." Polymers 13, no. 11 (2021): 1687. http://dx.doi.org/10.3390/polym13111687.

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New mesomorphic series, 4-hexadecyloxy phenyl-imino-4′-(3-methoxyphenyl)-4″-alkoxybenzoates (An), were prepared and investigated with different thermal and mesomorphic techniques. The synthesized homologous series constitutes four members that differ from each other in the terminal length of flexible chain (n) attached to phenyl ester moiety, which varies between n = 6, 8, 10, and 12 carbons. A lateral CH3O group is attached to the central benzene ring in the meta position with respect to the ester moiety. Molecular structures of all newly prepared homologues were elucidated via FT-IR, 1H and

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32

Song, H. H., T. C. Do, H. J. Jeon, and K. Tashiro. "Mesomorphic phase in oriented poly(pentamethylene 2,6-naphthalate)." Acta Crystallographica Section A Foundations of Crystallography 67, a1 (2011): C422. http://dx.doi.org/10.1107/s0108767311089392.

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33

Do, Thi Cuc, Hye-Jin Jeon, Hyun Hoon Song, Kohji Tashiro, Young Ho Kim, and Moonhor Ree. "Mesomorphic phase in oriented poly(pentamethylene 2,6-naphthalate)." Polymer 51, no. 5 (2010): 998–1001. http://dx.doi.org/10.1016/j.polymer.2010.01.040.

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34

Konishi, Takashi, Koji Nishida, and Toshiji Kanaya. "Crystallization of Isotactic Polypropylene from Prequenched Mesomorphic Phase." Macromolecules 39, no. 23 (2006): 8035–40. http://dx.doi.org/10.1021/ma060191b.

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35

Al-Mutabagani, Laila A., Latifah Abdullah Alshabanah, Hoda A. Ahmed, Mohamed Hagar, and Khulood A. Abu Al-Ola. "New Symmetrical U- and Wavy-Shaped Supramolecular H-Bonded Systems; Geometrical and Mesomorphic Approaches." Molecules 25, no. 6 (2020): 1420. http://dx.doi.org/10.3390/molecules25061420.

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New mesomorphic symmetrical 2:1 supramolecular H-bonded complexes of seven phenyl rings were prepared between 4-n-alkoxyphenylazobenzoic acids and 4-(2-(pyridin-3-yl)diazenyl)phenyl nicotinate. Mesomorphic studies of the prepared complexes were investigated using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Fermi bands of the formed H-bonded interactions were confirmed by FT-IR spectroscopy. Geometrical parameters for all complexes were performed using the density functional theory (DFT) calculations method. Theoretical results revealed that the prepared H-b

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36

Bubnov, Alexej, Miroslav Kašpar, Věra Hamplová, Ute Dawin, and Frank Giesselmann. "Thermotropic and lyotropic behaviour of new liquid-crystalline materials with different hydrophilic groups: synthesis and mesomorphic properties." Beilstein Journal of Organic Chemistry 9 (February 25, 2013): 425–36. http://dx.doi.org/10.3762/bjoc.9.45.

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Several new calamitic liquid-crystalline (LC) materials with flexible hydrophilic chains, namely either hydroxy groups or ethylene glycol units, or both types together, have been synthesized in order to look for new functional LC materials exhibiting both, thermotropic and lyotropic behaviour. Such materials are of high potential interest for challenging issues such as the self-organization of carbon nanotubes or various nanoparticles. Thermotropic mesomorphic properties have been studied by using polarizing optical microscopy, differential scanning calorimetry and X-ray scattering. Four of th

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37

George, A. K., D. M. Potukuchi, S. H. Al-Harthi, and C. Carboni. "Mesomorphism in a Binary Mixture of Non-mesogens: A Dielectric Spectroscopy Investigation." Zeitschrift für Naturforschung A 59, no. 10 (2004): 659–64. http://dx.doi.org/10.1515/zna-2004-1006.

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We report on thermal microscopy and low frequency dielectric relaxation of a liquid crystal formed by mixing cholesterol with 1-hexadecanol. Though both components are non-mesogenic, the mixture is found to exhibit a smectic A phase. A 1 Vp-p a. c signal of 100 kHz was used to study the dielectric response, while the frequency was varied from 5 Hz to 10 MHz for relaxation studies. The dielectric loss in the smectic A phase exhibits a single Debye-type off-centered relaxation in the MHz region. The temperature variation of the relaxation frequency is presented by Arrhenius plots, and the corres

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38

Padmaja, S., M. Srinivasulu, and Venkata G. K. M. Pisipati. "Higher Homologues of Mesomorphic Benzylidene Anilines. Manifestation of Smectic Polymorphism." Zeitschrift für Naturforschung A 58, no. 9-10 (2003): 573–80. http://dx.doi.org/10.1515/zna-2003-9-1017.

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The synthesis and characterisation of higher homologues of the well-known benzylidene anilines, viz. N-(p-n-tridecyloxy, tetradecyloxy, and hexadecyloxy benzylidene)-p-n-alkylanilines, 13O.m, 14O.m and 16O.m liquid crystalline compounds have exhibited mono, bi and tri phase variant smectic polymorphism. The different liquid crystalline phases are characterized by an optical polarising microscope equipped with a PC based temperature controller. The phase transitions are studied by using differential scanning calorimetry. The results are discussed in the light of the data available on other nO.m

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39

Kozhevnikov, Valery N., Bertrand Donnio, Benoît Heinrich, and Duncan W. Bruce. "Morphology-driven absorption and emission colour changes in liquid-crystalline, cyclometallated platinum(ii) complexes." Chem. Commun. 50, no. 91 (2014): 14191–93. http://dx.doi.org/10.1039/c4cc06958g.

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Platinum(ii) complexes of 1,3-bis(2-pyridyl)benzene containing two alkyl chains are unexpectedly mesomorphic and capable of changing absorption and emission colour depending on the phase obtained after thermal treatment.

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40

Padmaja, S., M. Ramakrishna Nanchara Rao, P. V. Datta Prasad, and V. G. K. M. Pisipati. "Studies of the Orientational Disorder at the Isotropic to Smectic-F Interface." Zeitschrift für Naturforschung A 60, no. 4 (2005): 296–300. http://dx.doi.org/10.1515/zna-2005-0414.

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Abstract Density studies on the isotropic to smectic-F transition in higher homologues of N-(p-nalkoxybenzylidene)- p-n-decylanilines (nO.10) mesomorphic compounds with n = 13, 14 and 15 and corresponding studies on thermal expansion coefficient maxima confirm the first order nature of this transition. The density shows strong pretransitional fluctuations, which are estimated by αeff in the vicinity of the mesomorphic fluctuation dominated non-linear region (FDNLR) of this phase transition. The growth of the density fluctuations across this transition is discussed in the light of data on the s

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Ahmed, Hoda A., and Muna S. Khushaim. "Nematic Phase Induced from Symmetrical Supramolecular H-Bonded Systems Based on Flexible Acid Core." Crystals 10, no. 9 (2020): 801. http://dx.doi.org/10.3390/cryst10090801.

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New symmetrical 1:2 supramolecular H-bonded liquid crystals (SMHBLCs) interactions, A/2Bn, were formed between adipic acid and 4-(4′–pyridylazophenyl) 4″-alkoxybenzoates. Optical and mesomorphic behaviors of the prepared SMHBLC complexes were investigated using differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD). FT-IR spectroscopy was carried out to confirm the H-bond interactions of the prepared complexes via Fermi bands formation. Their photo-physical properties were investigated by UV-spectroscopy and the observed absorbance values were

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García-Peñas, Alberto, José M. Gómez-Elvira, María L. Cerrada, and Ernesto Pérez. "Dependence of phase transitions on composition in isotactic poly(propylene-co-1-pentene-co-1-hexene) terpolymers." RSC Advances 6, no. 86 (2016): 82907–15. http://dx.doi.org/10.1039/c6ra16575c.

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Several polymorphs (monoclinic, orthorhombic, trigonal and mesomorphic) are observed in metallocenic isotactic poly(propylene-co-1-pentene-co-1-hexene) terpolymers, depending on composition and crystallization conditions.

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43

Alamro, Fowzia S., Hoda A. Ahmed, Mohamed A. El-Atawy, Salma A. Al-Zahrani, and Alaa Z. Omar. "Induced Nematic Phase of New Synthesized Laterally Fluorinated Azo/Ester Derivatives." Molecules 26, no. 15 (2021): 4546. http://dx.doi.org/10.3390/molecules26154546.

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A new series of laterally fluorinated mesomorphic compounds, namely 2-fluoro-4-((4-(alkyloxy)phenyl)diazenyl)phenyl 4-substitutedbenzoate (Inx) were prepared and evaluated for their mesophase behavior. The synthesized series constitutes five members that possess different terminally attached polar groups (X). Their molecular structures were confirmed by elemental analyses and both FT-IR and NMR spectroscopy. Examination of the prepared derivatives was conducted via experimental and theoretical tools. Mesomorphic investigations were carried by polarized optical microscopy (POM) and differential

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TOSAKA, Masatoshi. "Formation of Mesomorphic Phase and Crystallization in Silicone Rubber." NIPPON GOMU KYOKAISHI 90, no. 7 (2017): 329–32. http://dx.doi.org/10.2324/gomu.90.329.

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Goderis, B., M. Basiura, V. B. F. Mathot, J. Sworen, and K. Wagener. "Evidence for a mesomorphic phase in precisely branched polyethylenes." Acta Crystallographica Section A Foundations of Crystallography 62, a1 (2006): s263. http://dx.doi.org/10.1107/s010876730609475x.

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Jadżyn, J., G. Czechowski, B. Żywucki, C. Legrand, P. Bonnet, and R. Dąbrowski. "Dielectric Properties of Mesomorphic n-TPEB's in Isotropic Phase." Zeitschrift für Naturforschung A 48, no. 8-9 (1993): 871–74. http://dx.doi.org/10.1515/zna-1993-8-906.

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Dielectric relaxation studies have been performed for the isotropic phase of a series of mesogenicmolecules of l-[3-n-alkyl-biphenyl]-2-[4-isothiocyanatophenyl]ethane, CnH2n+1-Φ-Φ-CH2CH2-Φ-NCS (n-TPEB), for n = 7, 8 and 9. Two Debye-type dielectric absorption bands have beeninterpreted as corresponding to the rotation around the short and long molecular axis.

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Deptuch, Aleksandra, Teresa Jaworska-Gołąb, Monika Marzec, et al. "Mesomorphic phase transitions of 3F7HPhF studied by complementary methods." Phase Transitions 91, no. 2 (2017): 186–98. http://dx.doi.org/10.1080/01411594.2017.1393814.

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Koido, Shunsuke, Takahiko Kawai, Shinichi Kuroda, et al. "Mesomorphic phase formation of plasticized poly(l-lactic acid)." Journal of Applied Polymer Science 131, no. 2 (2013): n/a. http://dx.doi.org/10.1002/app.39762.

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Deschenaux, Robert, Jean-Luc Marendaz, Julio Santiago, and John W. Goodby. "Crystal Smectic-B Phase from a Mesomorphic Ferrocene Derivative." Helvetica Chimica Acta 78, no. 5 (1995): 1215–18. http://dx.doi.org/10.1002/hlca.19950780514.

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Popa, Evelyn, Adelina A. Andelescu, Sorina Ilies (b. Motoc), et al. "Hetero-Bimetallic Ferrocene-Containing Zinc(II)-Terpyridyl-Based Metallomesogen: Structural and Electrochemical Characterization." Materials 16, no. 5 (2023): 1946. http://dx.doi.org/10.3390/ma16051946.

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The synthesis, as well as the mesomorphic and electrochemical properties, of a hetero-bimetallic coordination complex able to self-assemble into a columnar liquid crystalline phase is reported herein. The mesomorphic properties were investigated by polarized optical microscopy (POM), differential scanning calorimetry (DSC) and Powder X-ray diffraction (PXRD) analysis. Electrochemical properties were explored by cyclic voltammetry (CV), relating the hetero-bimetallic complex behaviour to previously reported analogous monometallic Zn(II) compounds. The obtained results highlight how the presence

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