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Related Experiment Video

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Culturing and Applications of Rotating Wall Vessel Bioreactor Derived 3D Epithelial Cell Models

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Columnar mesomorphic organizations in cyclotriphosphazenes.

Joaquín Barberá¹, Manuel Bardají, Josefina Jiménez

¹Polymer and Liquid Crystal Group--Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-C.S.I.C., 50009 Zaragoza, Spain.

Journal of the American Chemical Society

|June 23, 2005

Summary

New organocyclotriphosphazenes with aromatic ester units exhibit tunable mesomorphism. Depending on the structure of terminal chains, they form either cylindrical (calamitic) or disc-like (columnar) liquid crystal phases with high thermal stability.

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Area of Science:

Materials Science
Supramolecular Chemistry
Organic Chemistry

Background:

Organocyclotriphosphazenes are versatile molecular platforms.
Liquid crystals exhibit ordered phases between solid and isotropic states.
Mesomorphism is influenced by molecular architecture and intermolecular interactions.

Purpose of the Study:

To develop a synthetic strategy for novel organocyclotriphosphazenes.
To investigate the relationship between molecular structure and mesomorphic behavior.
To explore the potential for tunable liquid crystalline properties.

Main Methods:

Synthesis of cyclotriphosphazenes bearing polycatenar aromatic ester units.
Characterization of synthesized compounds using techniques like X-ray diffraction.
Thermal analysis to determine mesophase behavior and stability.

Main Results:

Successful synthesis of organocyclotriphosphazenes with specific promesogenic units.
Demonstration of calamitic mesomorphism with single terminal alkyl chains, forming cylindrical superstructures.
Observation of columnar mesophases with three long terminal chains, forming discotic structures.
X-ray diffraction confirmed helical ordering in columnar phases.
All synthesized compounds exhibited high thermal stability.

Conclusions:

The microsegregation of rigid and flexible segments dictates mesomorphism.
Molecular design allows for control over the type of liquid crystalline phase formed.
These organocyclotriphosphazenes represent a promising class of materials for advanced applications.