A surfactant-encapsulated polyoxometalate complex towards a thermotropic liquid crystal

Wen, Liu; Bu, Weifeng; Li, Haolong; Wu, Lixin; Li, Min

doi:10.1039/b503550c

Cited by 88 publications

(55 citation statements)

References 22 publications

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“…[13] These materials show it is possible to retain the basic physical and chemical properties of the POM clusters, however, it should be emphasized that mainly electrostatic interactions exist Abstract: Grafting of C-6, C-16 and C-18 alkyl chains onto the hydrophilic Mn-Anderson clusters (compounds 2-4) has been achieved. Exchange of the tetrabutyl ammonium (TBA) with dimethyldioctadecyl ammonium (DMDOA) results in the formation of new polyoxometalate (POM) assemb-A C H T U N G T R E N N U N G lies (compounds 5-6), in which the POM cores are covalently functionalized by hydrophilic alkyl-chains and enclosed by surfactant of DMDOABr.…”

Section: Introductionmentioning

confidence: 99%

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

Song

McMillan

Long

et al. 2008

Chemistry A European J

140

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Grafting of C-6, C-16 and C-18 alkyl chains onto the hydrophilic Mn-Anderson clusters (compounds 2-4) has been achieved. Exchange of the tetrabutyl ammonium (TBA) with dimethyldioctadecyl ammonium (DMDOA) results in the formation of new polyoxometalate (POM) assemblies (compounds 5-6), in which the POM cores are covalently functionalized by hydrophilic alkyl-chains and enclosed by surfactant of DMDOABr. As a result, we have been able to design and synthesize POM-containing hydrophobic materials beyond surfactant encapsulation. In solid state, scanning electron and transmission electron microscopy (SEM and TEM) studies of the TBA salts of compounds 3 and 4 show highly ordered, uniform, reproducible assemblies with unique segmented rodlike morphology. SEM and TEM studies of the DMDOA salts of compounds 5 and 6 show that they form spherical and sea urchin 3D objects in different solvent systems. In solution, the physical properties of compound 5 and 6 (combination of surfactant-encapsulated cluster (SEC) and surface-grafted cluster (SGC)) show a liquid-to-gel phase transition in pure chloroform below 0 degrees C, which are much lower than other reported SECs. By utilizing light scattering measurements, the nanoparticle size for compounds 5 and 6 were measured at 5 degrees C and 30 degrees C, respectively. Other physical properties including differential scanning calorimetry have been reported.

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Section: Introductionmentioning

confidence: 99%

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

Song

McMillan

Long

et al. 2008

Chemistry A European J

140

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“…Figure 3 showed the polarization microscope images of [PW 11 (c). Wu also obtained thermotropic liquid crystals formed by surfactant-encapsulated polyoxometalate complexes [29,30]. Covalently modified polyoxometalates were reported to form supramolecular gels through hydrogen bonding [31,32].…”

Section: Self-assembly Of Modified Polyoxometalate Complexesmentioning

confidence: 96%

Assembly of Polyoxometalate-Based Composite Materials

Fan

Hao

Wei

2012

J Inorg Organomet Polym

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This paper is a review the polyoxometalatebased composite materials, including polyoxometalate incorporated Langmuir and Langmuir-Blodgett, layerby-layer multilayers and novel honeycomb films, selfassembly structures of modified polyoxometalate complexes (e.g., onion-like structures, new inorganic-organic-inorganic vesicles, thermotropic and lyotropic liquid crystalline structures, gels), and amino acid-and protein-polyoxometalate nanorods and nanoparticles. Polyoxometalate-embedded layer-by-layer multilayer films show electrocatalytic or photochemical activity; and, novel photoluminescent honeycomb films templated by microwater droplets are reviewed. Inorganic-organic-inorganic hybrid vesicles display the potential as nano-switches. In addition, amino acid-and proteinpolyoxometalate composite nanostructures indicate potential antimicrobial applications. Therefore, the polyoxometalatebased composite materials have promising applications in electrochemistry, photochemistry and biomedicine.

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“…With this idea in mind, we used a mesogenic ammonium surfactant carrying azobenzene units (S1) to encapsulate [Tb(SiW 11 O 39 ) 2 ] 13− cluster. [51] Polarized optical microscopy (POM) measurements showed that the resultant (S1) 13 / [Tb(SiW 11 O 39 ) 2 ] complex formed anisotropic fluids upon heating. The high-temperature mesophase of the complex showed flow textures after applying mechani-cal stress, while the low-temperature mesophase was more viscous.…”

Section: Thermal Behavior Of the Surfactant-encapsulated Polyoxometalmentioning

confidence: 99%

Hybrid Liquid Crystals from the Self‐Assembly of Surfactant‐Encapsulated Polyoxometalate Complexes

2014

Chin. J. Chem.

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The construction of nano-hybrid liquid crystals (LCs) has been intensively pursued because the unique traits of nano-objects together with the self-assembly features of LCs allow the development of novel anisotropic materials. Self-assembly of surfactant-encapsulated polyoxometalate (SEP) complexes, consisting of nano-sized cores and organic shells, provides particularly important contribution in this area. The main motivation for developing those nano-hybrid liquid crystals originates from the added-value combination between anionic polyoxometalates and cationic surfactants. This account describes recent work in our group to develop thermotropic SEP complexes that result from the sophisticated molecular design. Since the polyoxometalates possess well-defined topology, strictly mono-dispersed size, and precise surface charges, it is possible to get more insight into understanding of the influence of nature of components on the thermal property of nano-hybrid LCs. We briefly describe the general importance and advantage of nano-hybrid LCs. We then highlight the synthesis and characterization of thermotropic liquid crystals based on polyoxometalate nano-clusters. The driving forces behind the molecular self-assembly are discussed in depth. The various factors, including chain length, surfactant density and the size-matching effect, affecting the interfacial curvature and the LC properties are summarized. We expect that the structure-property relationships are virtually helpful for the design of new nano-hybrid LC materials.

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A surfactant-encapsulated polyoxometalate complex towards a thermotropic liquid crystal

Abstract: A novel surfactant-encapsulated terbium-substituted heteropolyoxotungstate complex [L1]13[Tb(SiW11O39)2].30H2O (SEC-1) bearing mesomorphous groups was successfully prepared by the ionic self-assembling route, exhibiting characteristic thermotropic liquid-crystalline behavior.

Cited by 88 publications

References 22 publications

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

Assembly of Polyoxometalate-Based Composite Materials

Hybrid Liquid Crystals from the Self‐Assembly of Surfactant‐Encapsulated Polyoxometalate Complexes

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