Photo- and electrochromic properties of covalently connected symmetrical and unsymmetrical spiropyran–polyoxometalate dyads

Oms, Olivier; Hakouk, Khadija; Dessapt, Rémi; Deniard, Philippe; Jobic, Stéphane; Dolbecq, Anne; Palacin, Thomas; Nadjo, Louis; Keita, Bineta; Marrot, Jérôme; Mialane, Pierre

doi:10.1039/c2cc35376h

Cited by 70 publications

(67 citation statements)

References 31 publications

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“…[10] Aiming at multielectrochromic and photochromic properties, Pierre et al obtained one or two spiropyran grafted Anderson-type POMs with Mn III as the center atom through the same synthetic procedure. [11] Very recently, a range of improvements for the isolation of asymmetrically grafted organic-inorganic hybrid Mn-Anderson-type POM compounds were summarized and reported. [12] However, the above mentioned approaches still result in an initially symmetric Tris-modification.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Single‐Side Organically Grafted Anderson‐Type Polyoxometalates

Wang

et al. 2014

Eur J Inorg Chem

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Single‐Side Organically Grafted Anderson‐Type Polyoxometalates

Wang

et al. 2014

Eur J Inorg Chem

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“…Amplitude sweep measurements in Figure 2a show that the blank gel has a higher viscoelastic modulus (15)(16)(17)(18)(19)(20) kPa) compared to the 20k porous gel with a modulus of 6 -7 kPa and the least stiff 2k porous gel …”

Section: Mechanical Stability Of the Gelsmentioning

confidence: 99%

“…The closed, colourless, hydrophobic form referred often as benzospiropyran and the open, coloured, charged merocyanine form. The molecules can be switched between these two forms by light irradiation (photochromism) [15][16][17], electrochemical stimulation (electrochromism) [17][18][19][20], or changing the solvent environment (solvatochromism). [17,21] As a result of these unique properties, spiropyrans have been used, in combination with many different materials, for the fabrication of both sensors, actuators and stimulus responsive materials.…”

Section: Introductionmentioning

confidence: 99%

Porous self-protonating spiropyran-based NIPAAm gels with improved reswelling kinetics

et al. 2015

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This study focuses on improving the speed of actuation of poly(N-isopropylacrylamide)-based photoresponsive gels containing copolymerised spiropyran as the photoswitch and acrylic acid as the proton source. The improvement is realised by introducing pores into the material. For this purpose, polyethylene glycol (PEG) of two molecular weights (2,000 and 20,000 g mol -1 ) has been used as the porophore in the polymerisation mixture. Upon removal of the PEG porophore post polymerisation, hydrogels of different pore sizes were obtained. This impacts the diffusion of water molecules moving in/out of the hydrogel matrix, thus improving the swelling and shrinking kinetics of the hydrogel due to reduction of the average diffusion pathlength. Most significant improvement was observed in the re-swelling step and is demonstrated with optical microscopy combined with kinetic ultraviolet-visible spectroscopy (UV-Vis) analysis. Scanning Electron Microscopy reveals the PEG-induced pores to be in the range of 0.1 -2 µm. Moreover, the mechanical stability of the gels is confirmed with rheometry. Lastly, the presented photoresponsive porous gels exhibit an order of magnitude faster reswelling rate compared to the non-PEG produced control sample.

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“…Structures of dual photochromic/electrochromic compounds based on spiropyrans and polyoxometalates with "covalent bonding" (left) (Reproduced with permission. [241] Copyright 2012, Royal Society of Chemistry.) and "electrostatic interaction" (right, Reproduced with permission.…”

Section: Q9mentioning

confidence: 99%

“…with high photochromic performance, have been recently integrated in POM structures via covalent bonds [241][242][243] and noncovalent interactions [244,245] with different performances. The systematic study of Hakouk et al [242] is especially interesting since they analyze the photochromic behavior taking into account several physical parameters (SP structural characteristics, SP/POM and SP/solvent solid-state interactions, molar volume, etc).…”

Section: Q9mentioning

confidence: 99%

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

Parola

Julián‐López

Carlos

et al. 2016

Adv Funct Materials

249

116

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Research on hybrid inorganic‐organic materials has experienced an explosive growth since the 1980s, with the expansion of soft inorganic chemistry based processes. Indeed, mild synthetic conditions, low processing temperatures provided by “chimie douce” and the versatility of the colloidal state allow for the mixing of the organic and inorganic components at the nanometer scale in virtually any ratio to produce the so called hybrid materials. Today a high degree of control over both composition and nanostructure of these hybrids can be achieved allowing tunable structure‐property relationships. This, in turn, makes it possible to tailor and fine‐tune many properties (mechanical, optical, electronic, thermal, chemical…) in very broad ranges, and to design specific multifunctional systems for applications. In particular, the field of “Hybrid‐Optics” has been very productive not only scientifically but also in terms of applications. Indeed, numerous optical devices based on hybrids are already in, or very close, to the market. This review describes most of the recent advances performed in this field. Emphasis will be given to luminescent, photochromic, NLO and plasmonic properties. As an outlook we show that the controlled coupling between plasmonics and luminescence is opening a land of opportunities in the field of “Hybrid‐Optics”.

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Photo- and electrochromic properties of covalently connected symmetrical and unsymmetrical spiropyran–polyoxometalate dyads

Abstract: Polyoxometalates covalently linked to one or two spiropyran entities have been isolated. These organic-inorganic hybrids exhibit multi-electrochromic and photochromic properties.

Cited by 70 publications

References 31 publications

Synthesis and Characterization of Single‐Side Organically Grafted Anderson‐Type Polyoxometalates

Synthesis and Characterization of Single‐Side Organically Grafted Anderson‐Type Polyoxometalates

Porous self-protonating spiropyran-based NIPAAm gels with improved reswelling kinetics

Optical Properties of Hybrid Organic‐Inorganic Materials and their Applications

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