Synthesis and photoinduced coloration of ferric bipyridine complex linked viologen units in a polymer matrix

Jin, Jing-Ji; Haramoto, Yuichiro; Nanasawa, Masato

doi:10.1002/(sici)1521-3927(19990301)20:3<135::aid-marc135>3.0.co;2-6

Cited by 6 publications

(1 citation statement)

References 13 publications

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“…Amberlite XAD‐16) and Fe(III) was reduced to Fe(II) on the adsorbent surface with reducing action of analyte. The Fe(II) obtained is then able to react with Bpy in order to form a coloured ferroin complex ([Fe(Bpy) 3 ] 2+ )11–13. In fact, Fe(III) complexed with Bpy is a stronger oxidizing agent than Fe 3+ (due to selective stabilization of the ferrous state) and Fe(II)‐Bpy emerging as the product of the redox reaction has a much more intense colour than the corresponding Fe(III)‐complex.…”

Section: Introductionmentioning

confidence: 99%

Colourimetric solid‐phase extraction coupled with fibre optic reflectance spectroscopy for determination of ascorbic acid in pharmaceutical formulations

Filik

Aksu

Giray

et al. 2011

Drug Testing and Analysis

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A redox colourimetric solid-phase extraction (C-SPE) procedure for the determination of ascorbic acid (AA) in pharmaceutical formulations was proposed. Iron (III)-2,2'-dipyridyl (Fe(III)-Bpy) reagent solution was used as a colouring reagent for AA and the immobilization of the redox product onto Amberlite XAD-16 resin was achieved. The analyte in the sample reacted with a solid sorbent loaded with the colourimetric reagent (Fe(III)-Bpy) and then quantified directly on the sorbent surface by using a fibre optic reflectance spectrometer (FORS). The amount of AA was reflectometrically determined in a few seconds with a total sample workup and readout time of ∼10 min using only 10-ml sample volumes. The limit of detection (LOD) and quantification (LOQ) values were 0.18 and 0.6 mg L(-1), respectively, and the linear dynamic range for AA extended up to 8.8 mg L(-1). The C-SPE for different extractions (n = 5) gave a relative standard deviation (RSD) of 2.9% at 5.28 mg L(-1) AA level.

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Section: Introductionmentioning

confidence: 99%

Colourimetric solid‐phase extraction coupled with fibre optic reflectance spectroscopy for determination of ascorbic acid in pharmaceutical formulations

Filik

Aksu

Giray

et al. 2011

Drug Testing and Analysis

View full text Add to dashboard Cite

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Twenty Years of Polymer‐Clay Nanocomposites

Okada

Usuki

2006

Macro Materials & Eng

724

342

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More than twenty years have passed since we invented PCN, in which only a few wt.-% of silicate is randomly and homogeneously dispersed in the polymer matrix. When molded, these nanocomposites show superior properties compared to those of pristine polymers. The number of papers on PCN has increased rapidly in recent years, reaching over 500 in 2005 alone. Being pioneers of this new technology, we review its history relative to the following epochal events: In 1985 we invented nylon 6-clay hybrid (NCH), the first PCN. In 1989, cars equipped with a NCH part were launched.In 1997, Gilman found revolutionary fire retardancy in NCH. In 1997, a PP-clay nanocomposite was prepared using a compatibilizer. In 1998, a compounding method for producing PCN was completed. In 2002, Haraguchi invented a revolutionary nanocomposite hydrogel. So far, only nylon-clay nanocomposites have been used in practice, but other PCN will become increasingly useful in the future.SEM of etched NCH film.

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Preparation and properties of polyethylene/montmorillonite nanocomposites formed via ethylene copolymerization

Guo

Liu

et al. 2009

Polymer International

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BACKGROUND: In situ formation of polyethylene/clay nanocomposites is one of the prevalent preparation methods that include also solution blending and melt blending with regard to process simplification, economy in cost, environment protection and marked improvement in the mechanical properties of the polymeric matrix. In the work reported here, the preparation of linear low‐density polyethylene (LLDPE) and fabrication of polymer/clay nanocomposites were combined into a facile route by immobilizing pre‐catalysts for ethylene oligomerization on montmorillonite (MMT).RESULTS: [(2‐ArNC(Me))2C5H3N]FeCl2 (Ar = 2,4‐Me2(C6H3)) was supported on MMT treated using three different methods. The MMT‐supported iron complex together with metallocene compound rac‐Et(Ind)2ZrCl2 catalyzed ethylene to LLDPE/MMT nanocomposites upon activation with methylaluminoxane. The oligomer that was formed between layers of MMT promoted further exfoliation of MMT layers. The LLDPE/MMT nanocomposites were highly stable upon heating. Detailed scanning electron microscopy analysis revealed that the marked improvement in impact strength of the LLDPE/MMT nanocomposites originated from the dispersed MMT layers which underwent cavitation upon impact and caused plastic deformation to absorb most of the impact energy. In general, the mechanical properties of the LLDPE/MMT nanocomposites were improved as a result of the uniform dispersion of MMT layers in the LLDPE matrix.CONCLUSION: The use of the MMT‐supported iron‐based diimine complex together with metallocene led to ethylene copolymerization between layers of MMT to form LLDPE/MMT nanocomposites. The introduction of exfoliated MMT layers greatly improved the thermal stability and mechanical properties of LLDPE. Copyright © 2009 Society of Chemical Industry

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Synthesis and photoinduced coloration of ferric bipyridine complex linked viologen units in a polymer matrix

Cited by 6 publications

References 13 publications

Colourimetric solid‐phase extraction coupled with fibre optic reflectance spectroscopy for determination of ascorbic acid in pharmaceutical formulations

Colourimetric solid‐phase extraction coupled with fibre optic reflectance spectroscopy for determination of ascorbic acid in pharmaceutical formulations

Twenty Years of Polymer‐Clay Nanocomposites

Preparation and properties of polyethylene/montmorillonite nanocomposites formed via ethylene copolymerization

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