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2 edition of Assessment of some novel thermotropic liquid crystalline phthalocyanines. found in the catalog.

Assessment of some novel thermotropic liquid crystalline phthalocyanines.

Steven J. Cracknell

Assessment of some novel thermotropic liquid crystalline phthalocyanines.

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Published by University of East Anglia in Norwich .
Written in English


Edition Notes

Thesis (Ph.D.), University of East Anglia, School of Chemical Sciences, 1991.

ID Numbers
Open LibraryOL20494160M

The phthalocyanines are a class of organic semiconductors which are chemically and thermally stable, and, thus, suitable for the preparation of thin film [1]. They commonly exist in at least two different crystalline phases, the α-and β- forms [2]. It was reported that the β - form is a monoclinic crystal. Synthesis and characterization of novel nonsymmetrical phthalocyanines as sensitizers for photovoltaic devicesAuthor: Giuseppina Giordano. phthalocyanines (MPc’s) has two main reasons: their numerous technological applications [1], such as chemical sensors [2; 3], use in optoelectronic devices [4] and solar cells [5] and their similarity to the biological molecules chlorophyll and haemoglobin. Haemoglobin in particular, is a close relative of iron(II) phthalocyanine (FePc). Thermotropic liquid crystal (LC) materials are widely used in the electro-optical (EO) display industry since Over 40 years of technological development in EO display, liquid crystal display (LCD) becomes an essential part of human life and it is beneficial to everyone.


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Assessment of some novel thermotropic liquid crystalline phthalocyanines. by Steven J. Cracknell Download PDF EPUB FB2

Thermotropic liquid crystalline Two basic questions of liquid crystalline polymer are the stabilization of LC-phase and the effect of mesogenic units. Onsager and Flory [1], [2] have treated mesogenic units as rigid cylinders or bars which interact with their neighbours exclusively by their Author: Guo Yao, Yi Gu.

The transition temperatures observed upon heating and cooling are summarised in Table 1. All mesophases were found to be very viscous at lower temperatures. * corresponding nuthor Synthetic Metals () A Series of Novel Liquid Crystalline Octakis(alkylthio)-substituted Phthalocyanines K.

Petritsch h, by: The basic features that distinguish the various liquid crystalline phases from the other condensed phases will be given, and the type of chemical compounds will be discussed. The various types of thermotropic mesophases formed from rod-like molecules will be described in some detail and the order parameters that characterize them will be by: 3.

In summary, pHBA is the major monomer in liquid crystal polymers (LCPs). These thermotropic polyesters have excellent properties, including high strength/stiffness, low melt viscosity, property. Thermotropic Liquid Crystal Polymer Blends - CRC Press Book. In recent years, studies by both industry and academic researchers have opened the door to improving performance and reducing costs of these new materials.

The particular structure and morphology of LCPs, as well as their peculiar rheological behavior, have stimulated researchers to.

Effects of Novel Thermotropic Liquid Crystalline Polyester with Aryl-Ether Linkages on the Processability and Properties of Poly(ether ether ketone)s Fibers Article April Novel Thermotropic Liquid Crystals with Lateral Aryl Substituent Dixit Sandhya Department of Applied Chemistry; Faculty of Technology and Engineering, The M.S.

University of Baroda, VadodaraGujarat, INDIA Available online at:Received 14 th Augustrevised 5 Septemberaccepted 12 th September The full text of this article hosted at is unavailable due to technical difficulties. A liquid crystal (LC) is thermotropic if the order of its components [clarify] is determined or changed by temperature.

If temperature is too high, the rise in energy and therefore in motion of the components will induce a phase transition: the LC will become an isotropic liquid. If, on the contrary, temperature is too low to support a thermotropic phase, the LC will change to glass phase.

Abstract. The phenomenon of liquid crystallinity was discovered by Reinitzer 1 in during a study of the melting behavior of cholesteryl esters, and the structure-property relationships in low molecular weight liquid crystalline (LC) systems are now well understood (see e.g.

References 2–4). Liquid crystallinity in higher molecular weight organic substances was reported more recently: in Cited by: LIST OF FIGURES 1. Schematic illustration of the solid, liquid crystal, and liquid phases 2.

Molecular arrangements in thethree major Friedelian classesof liquid crystals: (a) nematic; (b) cholesteric (the twist axis is horizontal) and (c(i)) smecticA and (c(ii)) smectic C 3. Phase diagram forp-azoxyanisole (PAA).

8 4. Complete phasediagram for cholesteryl myristate along with. Journal of Porphyrins and Phthalocyanines16 (10), DOI: /S Florian Latteyer, Sabine Savu, Heiko Peisert, Thomas Chassé. Self-assembly and structure formation in liquid crystalline phthalocyanine thin films studied by Raman spectroscopy and by: Thermotropic liquid crystalline behavior of polymeric materials is of considerable current interest, not only because of their potential as high-strength fibers, plastics, moldings etc.

[], but also because of their unique position in the theoretical scheme of structural order in liquid phases [4].These thermotropic liquid crystalline (mesomorphic) polymers have two basic types [5]: one.

In recent years thermotropic liquid crystalline polyesters have received a great deal of attentIn the s some very interesting attempts were made to synthesize thermotropic random copolymers by introducing two different lengths of flexible spacers in the main-ch The primary motivation behind such attempts was to decrease Cited by: 1.

We present a joint molecular dynamics (MD)/kinetic Monte Carlo (KMC) study aimed at the atomistic description of charge transport in stacks of liquid-crystalline tetraalkoxy-substituted, metal-free phthalocyanines. The molecular dynamics simulations reproduce the major structural features of the mesophases, in particular, a phase transition around K between the rectangular and hexagonal Cited by: Pyrazole functionalized phthalodinitriles derived from 4,5-dichlorophthalonitrile by SnAr reactions were used as precursors for the synthesis of phthalocyanines substituted with pyrazolyl groups in the 2,3,9,10,16,17,23,positions.

The phthalocyanines were characterized by means of. Classification of liquid crystals 1. Thermotropic liquid crystal ¾Thermally induced transition to the liquid crystalline state ¾Thermotropic mesophases occur because of anisotropic dispersion forcesbetween the molecules and packing interactions Enantiotropic (lowering the.

was made in understanding liquid crystals (by F.C. Frank and others). At the end of s, cholesteric LCs were being suggested as temperature indicators, analytical Fig.

Relationship of liquid crystalline phase with liquid and crystalline solid. Fig. Typical rod-like shape of a liquid crystal Size: KB.

Buy Synthesis and Characterisation of Novel Discotic Liquid Crystals Based on Triphenylene and Phthalocyanine Cores by Hemant Gopee (ISBN:) from Amazon's Book Store. Everyday low prices and free delivery on eligible : Hemant Gopee.

LIQUID CRYSTALS: Synthesis Bent-core mesogens: The chemistry wing of the Soft Condensed Matter Group is involved in the synthesis and characterisation of mesomorphic banana-shaped or bent-core molecules. Over such compounds have been synthesized and characterized.

In addition to many novel mesophases, these compounds show interesting features such as spontaneous electric. Phthalocyanines. Part VI. The structure of the phthalocyanines C.

Dent, R. P books or book chapters) do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material. This may take some time to load.

Back to tab navigation Cited by: Supporting Information High rectification in organic diodes based on liquid crystalline phthalocyanines Petru Apostola, Juliana Eccher*b, Marta Elisa Rosso Dottob, Cassiano Batesttin Costac, Thiago Cazatic, Elizabeth A.

Hillarda, Harald Bocka and Ivan H. Bechtold*b aCentre de Recherche Paul Pascal, Université de Bordeaux & CNRS, Avenue Schweitzer, This paper describes the synthesis and characterization of a novel mesostructured solid electrolyte composite material, denoted meso‐SiO 2 –C 12 EO 10 OH–CF 3 SO 3 H.

A lyotropic non‐ionic surfactant–triflic acid–silicate liquid crystal is used as a supramolecular template for a.

Book description McKeever gives us a comprehensive survey of thermoluminescence, an important, versatile, and widely used experimental technique.

Bringing together previously isolated specialized approaches, he stresses the importance of the solid state aspects of the by: Phthalocyanine Research and Applications - CRC Press Book.

The purpose of this monograph is to provide a summary for those who are active in the field of phthalocyanine research. This volume allows the reader to quickly-and at a reasonable cost-determine what is being accomplished so that he may plan his own research programs.

According to a reported study, this compound is thermotropic liquid crystalline and undergoes a phase transition at 62 °C and, thus, can only be annealed at 70 °C. (43) Bottom-contact transistors produced with an OTS templating layer demonstrated a μ value as high as 8 × 10 –3 cm 2 V –1 s –1, with I ON / I OFF = 10 5 and V T ≈ −13 by: Electronic properties of novel phthalocyanine based molecular crystals Marta Filibian PhD thesis – University of Pavia Printed in Pavia, Italy, November ISBN Schematic representation of the crystal structure of K CuPc- eprint arXiv:cond-mat/ USA Home > Product Directory > Materials Science > Organic and Printed Electronics > Photonic and Optical Materials > Phthalocyanine and Porphyrin Dyes > Phthalocyanines Materials Science Home Materials Science Products.

One of the important aims of research in the pdf ramayana chemistry ofphthalocyanines, and some closely related macro- cycles. We will restrict the review to solar photovoltaic cells, recognizing that there is a parallel ties of phthalocyanines and phthalocyanine derivatives are being.

phthalocyanines. Novel edifices were developed, based on the ability of iron to form dimeric structures via single atom bridge. Previous works evidenced that substituted O-bridge diiron phthalocyanines complexes are better oxidation catalysts than corresponding monomers, and following investigations regarding methane’s oxidationCited by: 1.

involved for the formation of the novel phthalocyanines (3 and 4). The non-peripherally and peripherally substituted Lu(OAc)Pcs (and 3 4) were formed by cyclotetrameriza-tion of the compounds 1 and 2 in the presence of anhydrous Lu(CH 3 COO) 3 and 1,8-diazabicyclo[]undecene (DBU) as a strong base in DMF at reflux temperature.

TheAuthor: Mehmet Pişkin, Zafer Odabaş. Synthesis and physical characteristics of nano crystalline LiMn 2-x Co x O 4 powder using combustion method Sheela Vimala Rani A*, Lalitha S and M B Sri Vidhya Department of Physics, Fatima College, Madurai, Tamil Nadu, India Abstract Spinel LiMn 2-x Co x O 4 powder with nano particle size powders were successfully synthesized by Solid state.

This review summarizes recent advances in the use of porphyrins, phthalocyanines, and related compounds as components of solar cells, including organic molecular solar cells, polymer cells, and dye-sensitized solar cells. The recent report of a porphyrin dye that achieves 11% power conversion efficiency in a dye-sensitized solar cell indicates that these classes of compounds can be as.

Solvent effects on the photochemical and fluorescence properties of zinc phthalocyanine derivatives Abimbola Ogunsipe, David Maree, Tebello Nyokong* Department of Chemistry, Rhodes University, P.O. GrahamstownSouth Africa Received 10 File Size: KB. Aligned Carbon Nanotubes in the Supramolecular order of Discotic Liquid Crystals.

Sandeep Kumar and H.K. Bisoyi Angew. Chem. Int. 46, (). 4: A room temperature discotic nematic liquid crystal Sandeep Kumar and Sanjay K. Varshney Angew. Chem. Int. Ed., 39/17, (). 5: Trisubstituted decacyclene derivatives. phthalocyanine pdf ocyanine 2, 9, 16, tetrachloro-3, 10, 17, tetra3-methoxyprop.

1 The H NMR studies of metal-free and metallo phthalocyanines. Properties of phthalocyanines and phthalocyanine derivatives are being studied. The nature of the phthalocyanine. Synthesis and Investigation of the Liquid Crystalline Properties of Polycyclic Aromatic Hydrocarbons Joseph A. Paquette Wilfrid Laurier University, [email protected] Follow this and additional works at: Part of the Materials Chemistry Commons, Organic Chemistry Commons, and the Physical Chemistry Commons.

determination of some essential parameters such as the hole mobility (µ h), the total trap concentration (N t), the characteristic temperature (T t) and the trap density P (E). Introduction: Phthalocyanines (Pcs) form a large group of organic semiconductor compounds, which have been the main basis for the search of molecular semiconductors [1].Cited by: Phthalocyanine complexes of paramagnetic metal ions show ESR spectra characteristic of the metals; phthalocyanine complexes of diamagnetic metal ions show strong single ESR lines characteristic of free radicals.

The source of this latter resonance is not understood. Intimate molecular mixtures of ``paramagnetic'' copper and ``dimagnetic'' zinc phthalocyanines exhibit exchange between the Cited by: Design and Synthesis of Novel Discotic Liquid Crystals Some derivatives form columnar mesophases and could be thermally cross‐linked in their columnar mesophase and their copper catalyzed cross‐linking in Langmuir and Langmuir‐Blodgett Characterization of Discotic Liquid Crystalline Phases.

This invention relates to the preparation of phthalocyanine pigments of improved properties. More particularly it relates to the recovery of copper-phthalocyanine or other pigments of the phthalocyanine series in a novel crystalline form, in combination with sulfuric acid, which renders the same readily filterable, washable and convertible into the respective free phthalocyanine compound in a.Discotic liquid crystals of organic transition metal complexes, Synthesis and mesomorphism of phthalocyanines substituted by m-alkoxyphenylthio groups: Yoshiaki Chino, Mutsumi Kimura, Kazuchika Ohta, Mikio Yasutake: Accepted on: Ma substituted phthalocyanines Hzl'c, NiPc and EuPc are mounted on the sample holder of the conductivity cell given in Figure of chapter 2.

Electrical contacts are made usir~g copper strands of diameter mm and are fixed to the specimen with:I colloidal suspension of silver in aqua or alkadag.