Thermotropic liquid crystalline poly(L-glutamate) esters with long alkyl chain containing aromatic segment at terminal position

New ionic liquids and ionic liquid crystalline materials with custom-tailored properties were synthesized based on long-alkyl-chain-derivatized 1,3-dialkylimidazolium salts.

Download Full-text

Template mediated crystal engineering

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010017013x ◽

1994 ◽

Vol 52 ◽

pp. 480-481

Author(s):

Brigid R. Heywood ◽

S. Champ

Keyword(s):

Crystal Engineering ◽

Electrostatic Interactions ◽

Alkyl Chain ◽

Crystallographic Axis ◽

Two Dimensional ◽

Engineering Process ◽

Solution Interface ◽

Extensive Program ◽

Geometric Homology ◽

Long Alkyl Chain

Recent work on the crystallisation of inorganic crystals under compressed monomolecular surfactant films has shown that two dimensional templates can be used to promote the oriented nucleation of solids. When a suitable long alkyl chain surfactant is cast on the crystallisation media a monodispersied population of crystals forms exclusively at the monolayer/solution interface. Each crystal is aligned with a specific crystallographic axis perpendicular to the plane of the monolayer suggesting that nucleation is facilitated by recognition events between the nascent inorganic solid and the organic template.For example, monolayers of the long alkyl chain surfactant, stearic acid will promote the oriented nucleation of the calcium carbonate polymorph, calcite, on the (100) face, whereas compressed monolayers of n-eicosyl sulphate will induce calcite nucleation on the (001) face, (Figure 1 & 2). An extensive program of research has confirmed the general principle that molecular recognition events at the interface (including electrostatic interactions, geometric homology, stereochemical complementarity) can be used to promote the crystal engineering process.

Download Full-text

Synthesis and modification of maleic anhydride-vinyl acetate copolymer by a long alkyl chain alcohol for cold flow impovers of biodiesel

Vietnam Journal of Science Technology and Engineering ◽

10.31276/vjste.60(3).03 ◽

2018 ◽

Vol 60 (3) ◽

pp. 3-8

Author(s):

Thi Thu Huong Tran ◽

Thi Tuyet Mai Phan ◽

Van Boi Luu ◽

Ngoc Lan Pham ◽

Keyword(s):

Maleic Anhydride ◽

Vinyl Acetate ◽

Alkyl Chain ◽

Chain Alcohol ◽

Cold Flow ◽

Acetate Copolymer ◽

Long Alkyl Chain

Download Full-text

X-ray Crystallographic Study of Alkylammonium Anthracene-9-carboxylates as a Model for Fibrous Structure of Binary Anthracene Salt Gels

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20041292 ◽

2004 ◽

Vol 69 (6) ◽

pp. 1292-1300 ◽

Cited By ~ 1

Author(s):

Tahahiro Tani ◽

Kazuki Sada ◽

Masatsugu Ayabe ◽

Yuya Iwashita ◽

Takanori Kishida ◽

...

Keyword(s):

Alkyl Chain ◽

Columnar Structure ◽

Hydrogen Bond Network ◽

One Dimensional ◽

X Ray ◽

Crystallographic Study ◽

Alkylammonium Salts ◽

Bond Network ◽

Fibrous Assemblies ◽

Long Alkyl Chain

Crystal structure of hexylammonium anthracene-9-carboxylate was investigated. The salt was arranged by a one-dimensional hydrogen bond network to form a columnar structure in the crystalline state. This columnar structure should be the model of fibrous assemblies in the organogels of anthracene-9-carboxylate alkylammonium salts having a long alkyl chain.

Download Full-text

Unusual enantiomeric separation due to residual amines in chiral crown ether stationary phase linked by long alkyl chain

Talanta ◽

10.1016/j.talanta.2021.122739 ◽

2021 ◽

pp. 122739

Author(s):

Ji Yeong Sung ◽

Sun-Mi Jin ◽

Sumin Lee ◽

Sung-Young An ◽

Jong Sung Jin

Keyword(s):

Crown Ether ◽

Stationary Phase ◽

Alkyl Chain ◽

Enantiomeric Separation ◽

Chiral Crown Ether ◽

Long Alkyl Chain

Download Full-text

Charge mobility in discotic liquid crystalline porphyrins and phthalocyanines measured by PR-TRMC

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424603000446 ◽

2003 ◽

Vol 07 (05) ◽

pp. 342-350 ◽

Cited By ~ 10

Author(s):

John M. Warman ◽

Jessica E. Kroeze ◽

Pieter G. Schouten ◽

Anick M. van de Craats

Keyword(s):

Conjugated Polymers ◽

Carrier Mobility ◽

Liquid Crystalline ◽

Alkyl Chain ◽

Charge Carrier Mobility ◽

Chain Structure ◽

Coupling Element ◽

Time Resolved ◽

Liquid Crystalline Phases ◽

Conductive Properties

The pulse-radiolysis time-resolved microwave conductivity technique, “PR-TRMC”, has been used to determine the charge carrier mobility within columnar stacks of mesomorphic discotic porphyrins and phthalocyanines. The influences of temperature, morphology and variations in the primary molecular structure are demonstrated and discussed. Both the mesomorphic and conductive properties are shown to be dramatically influenced by subtle changes in the peripheral alkyl chain structure or the core-to-chain coupling element. Mobilities close to 1 cm2.V−1.s−1 are found in crystalline solids, and well in excess of 0.1 cm2.V−1.s−1 in columnar, liquid crystalline phases. These values which are even larger than those determined by PR-TRMC for conjugated polymers and similar to values found for electrons and holes in organic single crystals.

Download Full-text