Azobenzene isomerization in polymer co-crystalline phases

Albunia, Alexandra R.; Rizzo, Paola; Coppola, Maria Gabriella; Pascale, Martina De; Guerra, Gaetano

doi:10.1016/j.polymer.2012.04.015

Cited by 37 publications

(33 citation statements)

References 87 publications

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“…3(D‐D′)]. For bulky guest molecules, like a dimer of styrene32 or azobenzene,75 the occurrence of a different intercalate structure, which is characterized by guest/monomer‐unit molar ratio of 1/4, has been suggested. Presently known s‐PS intercalate phases exhibit guest molecular volume in the range 0.15–0.36 nm 3 31, 32…”

Section: Cocrystalline Formsmentioning

confidence: 99%

Advanced materials based on polymer cocrystalline forms

Guerra

Daniel

Rizzo

et al. 2012

J Polym Sci B Polym Phys

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116

117

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Polymeric ''cocrystalline forms,'' that is, structures were a polymeric host and a low-molecular-mass guest are cocrystallized, were early recognized, and in many cases also well characterized by X-ray diffraction studies. However, only in the last two decades cocrystalline forms have received attention in material science, due to the ability (of few of them) to maintain an ordered polymer host structure even after guest removal, thus leading to the formation of ''nanoporous-crystalline forms,'' for which many applications in the fields of molecular separation and sensors have been proposed. Moreover, in the last decade, an accurate control of the orientation of the polymer cocrystalline phases has been achieved, thus leading to a control of the orientation of the guest molecules, not only in the crystalline phase but also in macroscopic films. In addition, on the basis of this orientation control, in the last few years, cocrystalline films where active molecules are present as guests of polymer cocrystalline phases have been proposed for optical, magnetic and electric applications. In the last few years, it has been also discovered that polymer cocrystallization, when induced by nonracemic guest molecules, can produce stable chiral optical films. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: [305][306][307][308][309][310][311][312][313][314][315][316][317][318][319][320][321][322] 2012

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Section: Cocrystalline Formsmentioning

confidence: 99%

Advanced materials based on polymer cocrystalline forms

Guerra

Daniel

Rizzo

et al. 2012

J Polym Sci B Polym Phys

Self Cite

116

117

View full text Add to dashboard Cite

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“…These seminal and encouraging results prompted us to definitively demonstrate the effectiveness of this nanoporous host polymer matrix in other examples of redox reactions catalyzed by AuNPs. Considering that both nitrobenzenes [20] and azobenzenes [21] produce stable cocrystals with the d and e forms of syndiotactic polystyrene we decided to explore the reduction of nitroaromatics using the AuNPs-sPSB catalyst and NaBH 4 as reductant, aiming also to elucidate the reaction pathway.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient and selective reduction of nitroarenes into anilines catalyzed by gold nanoparticles incarcerated in a nanoporous polymer matrix: Role of the polymeric support and insight into the reaction mechanism

Noschese

Buonerba

Canton

et al. 2016

Journal of Catalysis

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“…A new kind of functional materials would be developed by combining the characteristics of a host polymer lattice and those of a doped guest compound. The potential as novel functional polymer materials attracts strong attention, and many studies are actively being carried out …”

Section: Introductionmentioning

confidence: 99%

“…The potential as novel functional polymer materials attracts strong attention, and many studies are actively being carried out. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The guest molecules can be replaced smoothly when exposed to a vapor or a liquid of the substitute. [28][29][30][31] By using this unique phenomenon, we can form sPS crystalline complexes even with chemical compounds that are difficult to incorporate into the crystalline region by ordinary methods such as solution-cast and solvent-induced crystallization.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Time‐Resolved SAXS and WAXS Study on Guest Exchange Process of Syndiotactic Polystyrene with Aromatic Compounds: Size and Shape Effects of Target Molecules

Kaneko

Seto

Sato

et al. 2016

Macromolecular Symposia

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Summary One of the important characteristics of syndiotactic polystyrene (sPS) is that it forms cocrystals with a variety of chemical compounds. The guest exchange procedure is an effective method to introduce diverse chemical compounds into the crystalline region of sPS cocrystals; it enables sPS to form cocrystals even with chemical compounds that are difficult to incorporate into the crystalline region by usual crystallization. The original guest in the sPS cocrystal is replaced by another chemical when exposed to a vapor, a liquid or a solution of the new guest. In order to study the characteristics of the guest exchange process initiated by exposure to a liquid, simultaneous time resolved SAXS and WAXS measurements were carried out to follow the structure changes during the guest exchange process. A series of aromatic compounds, benzene, toluene, xylene (o‐ and p‐isomers) and mesitylene were employed as new guests. The simultaneous measurements enabled gathering information concerning both the higher order structure and the cocrystal structure. The exchange from the old guest to the new guest was also followed by FTIR spectroscopy. It is clarified that not only the size of the new guest molecules but also the molecular shape has a significant influence on the guest exchange behavior. It is also suggested that on the liquid‐phase guest exchange an expansion of the lamellar period somewhat precedes the guest exchange in the crystalline lamellae.

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Azobenzene isomerization in polymer co-crystalline phases

Cited by 37 publications

References 87 publications

Advanced materials based on polymer cocrystalline forms

Advanced materials based on polymer cocrystalline forms

Highly efficient and selective reduction of nitroarenes into anilines catalyzed by gold nanoparticles incarcerated in a nanoporous polymer matrix: Role of the polymeric support and insight into the reaction mechanism

Simultaneous Time‐Resolved SAXS and WAXS Study on Guest Exchange Process of Syndiotactic Polystyrene with Aromatic Compounds: Size and Shape Effects of Target Molecules

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