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Mixed-Substituent Cyclophosphazenes with Calamitic and Polycatenar Mesogens
J Jiménez1, L Callizo1, J L Serrano2
1Departamento de Química Inorgánica, Facultad de Ciencias - Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza-C.S.I.C. , Pedro Cerbuna 12, 50009 Zaragoza, Spain.
This study introduces a new method for creating unique liquid crystalline cyclotriphosphazenes with two distinct mesogenic units. The research highlights how terminal groups influence mesomorphism, with cyano-derivatives showing liquid crystal phases.
Area of Science:
- Materials Science
- Organic Chemistry
- Supramolecular Chemistry
Background:
- Cyclotriphosphazenes are versatile scaffolds for designing functional materials.
- Liquid crystals exhibit properties between conventional liquids and solid crystals.
- Tailoring molecular structure is key to controlling liquid crystalline behavior.
Purpose of the Study:
- To develop a synthetic strategy for novel liquid crystalline cyclotriphosphazenes.
- To investigate the influence of different mesogenic units on material properties.
- To explore the structure-property relationships governing mesomorphism.
Main Methods:
- Synthesis of hexachlorocyclotriphosphazene derivatives.
- Introduction of calamitic and polycatenar mesogenic units.
- Characterization using spectroscopic techniques and MALDI-TOF mass spectrometry.
Main Results:
- Successful synthesis of monodisperse, fully functionalized cyclotriphosphazenes.
- Nongem-trans-trisubstituted phosphazenes were major products.
- Mesomorphism was observed only in cyano-derivatives, with phase type dependent on polycatenar moiety structure.
Conclusions:
- A robust synthetic route for dual-mesogenic cyclotriphosphazenes was established.
- The terminal cyano group is crucial for inducing liquid crystalline phases.
- The architecture of the polycatenar unit dictates whether a calamitic or columnar mesophase is formed.
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