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Kaneko K, Mandai A, Heinrich B, Donnio B, Hanasaki T. Synthesis and mesomorphic properties of "side-on" hybrid liquid crystalline silsesquioxanes. SOFT MATTER 2023; 19:9115-9122. [PMID: 37990586 DOI: 10.1039/d3sm00801k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Novel hybrid silsesquioxane-based liquid crystalline derivatives with varied lengths of spacers and tails have been synthesized by hydrosilylation reactions of octakis(dimethylsiloxy)silsesquioxane and side-on mesogens via a platinum catalyst. The thermal behavior of three types of silsesquioxane-based liquid crystals (LCs), differentiated by the molecular structure of mesogens, was investigated by differential scanning calorimetry (DSC) and polarising optical microscopy (POM). Temperature-dependent small and wide-angle X-ray scattering was used to verify liquid crystalline phases, revealing that the silsesquioxane-based derivatives formed hexagonal columnar and nematic mesophases, and the effect of the molecular structure of the mesogens and the spacer length on the formation of LC phases is discussed. This investigation demonstrated that the choice of the "side-on" attachments plays a crucial role in enhancing the emergence of the nematic phase.
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Affiliation(s)
- Kosuke Kaneko
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, 1-1-1, Nojihigashi, Kusatsu, Shiga 525-8577, Japan.
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 (CNRS-Université de Strasbourg), 23, rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - Atsuhiko Mandai
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, 1-1-1, Nojihigashi, Kusatsu, Shiga 525-8577, Japan.
| | - Benoît Heinrich
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 (CNRS-Université de Strasbourg), 23, rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - Bertrand Donnio
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 (CNRS-Université de Strasbourg), 23, rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - Tomonori Hanasaki
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, 1-1-1, Nojihigashi, Kusatsu, Shiga 525-8577, Japan.
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Specific Bifunctionalization on the Surface of Phosphorus Dendrimers Syntheses and Properties. ORGANICS 2022. [DOI: 10.3390/org3030018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Dendrimers are highly branched macromolecules possessing, in most cases, identical terminal functions. However, it is sometimes desirable to have two types of surface functions in order to fulfil specific properties. The stochastic functionalization is frequently used for such purposes, but the presence of an uncontrolled number of each type of terminal function, albeit acceptable for research purposes, has no practical use. Thus, it is highly desirable to find strategies suitable for the precise grafting of two different functional groups on the surface of dendrimers. The easiest way, and the most widely used, consists in using a bifunctional monomer to be grafted to all of the surface functions of the dendrimers. Two other strategies are known but are rarely used: the modification of an existing function, to generate two functions, and the sequential grafting of one function then of a second function. The three methods are illustrated in this review with polyphosphorhydrazone (PPH) dendrimers, together with their properties as catalysts, for materials, and as biological tools.
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Uslu A, Yeşilot S. Recent advances in the supramolecular assembly of cyclophosphazene derivatives. Dalton Trans 2021; 50:2324-2341. [DOI: 10.1039/d0dt04095a] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
There is still room for improvement in supramolecular systems based on cyclophosphazene derivatives and their potential applications.
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Affiliation(s)
- Aylin Uslu
- Department of Chemistry
- Gebze Technical University
- Kocaeli
- Turkey
| | - Serkan Yeşilot
- Department of Chemistry
- Gebze Technical University
- Kocaeli
- Turkey
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Majoral J, Caminade A. Phosphorhydrazones as Useful Building Blocks for Special Architectures: Macrocycles and Dendrimers. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201801184] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Jean‐Pierre Majoral
- Laboratoire de Chimie de Coordination CNRS 205, route de Narbonne 31077 Toulouse Cedex 04 France
- LCC‐CNRS Université de Toulouse CNRS Toulouse France
| | - Anne‐Marie Caminade
- Laboratoire de Chimie de Coordination CNRS 205, route de Narbonne 31077 Toulouse Cedex 04 France
- LCC‐CNRS Université de Toulouse CNRS Toulouse France
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Caminade AM. Inorganic dendrimers: recent advances for catalysis, nanomaterials, and nanomedicine. Chem Soc Rev 2016; 45:5174-86. [PMID: 26936375 DOI: 10.1039/c6cs00074f] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dendrimers are hyperbranched polymers having a perfectly defined structure because they are synthesized step-by-step in an iterative fashion, and not by polymerization reactions. Some dendrimers are considered as inorganic, as they possess inorganic atoms at each branching point. Among numerous examples, two families of inorganic dendrimers have emerged as particularly promising: silicon-containing dendrimers, particularly carbosilanes, and phosphorus-containing dendrimers, particularly phosphorhydrazones. This tutorial review will display the main properties of both families of dendrimers in the fields of catalysis, materials and biology/nanomedicine. Emphasis will be put on the most recent and promising examples.
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Affiliation(s)
- Anne-Marie Caminade
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France.
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