Addition compounds and complexes with polymers and models

Schulz, Rolf C.; Fleischer, D.; Henglein, A.; Bössler, Heide M.; Trisnadi, J. Adriani; Tanaka, Hiroshi

doi:10.1351/pac197438010227

Cited by 23 publications

(9 citation statements)

References 74 publications

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“…Acting as a Lewis acid, molecular iodine reacts readily with electronrich molecules via a charge transfer mecha nism, to form charge transfer complexes (CTCs) [20], as confirmed by electron spin resonance spectroscopy [21]. Electronrich molecules, acting as Lewis bases, include those bearing atoms with lone pairs and aromatic ones.…”

Section: Molecular Iodine In Polymer Complexationmentioning

confidence: 94%

“…The solutions of this complex were deep blue, green, redorange or yellow, depending upon the conditions. The absorption maxima appeared at 600-620 nm, 650-680 nm, 480-500 nm and approxi mately 350 nm [20]. Taking advantage of the formation of the colored I 2 PVA complex, Yoshinaga et al [143] claimed that PVA (with a saponification degree of 88% and polymerization degree of 1000) would be as efficient as the conventional starch in iodometry.…”

Section: Iodine-proteinic Fiber Complexesmentioning

confidence: 99%

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Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

163

127

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A unique feature of molecular iodine by far, is its ability to bind to polymeric materials. A plethora of natural and synthetic polymers develop complexes when treated with molecular iodine, or with a mixture of mole cular iodine and potassium iodide. Many unexpected findings have been encountered upon complexation of iodine and the polymer skeleton, including the color formation, the polymer morphology changes, the compl exation sites or regions, the biological activity, and the electrical conductivity enhancement of the complexes, with poly iodides (I n¯) , mainly I 3¯ and I 5¯, as the actual binding species. Natural polymers that afford such complexes with iodine species are starch (amylose and amylopectin), chitosan, glycogen, silk, wool, albumin, cellulose, xylan, and natural rubber; iodinestarch being the oldest iodinenatural polymer complex. By contrast, numerous synthetic polymers are prone to make com plexes, including poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), nylons, poly(Schiff base)s, poly aniline, unsaturated polyhydrocarbons (carbon nano tubes, fullerenes C 60 /C 70 , polyacetylene; iodinePVA being the oldest iodinesynthetic polymer complex.

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Section: Molecular Iodine In Polymer Complexationmentioning

confidence: 94%

Section: Iodine-proteinic Fiber Complexesmentioning

confidence: 99%

Molecular iodine/polymer complexes

Moulay

2013

Journal of Polymer Engineering

163

127

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“…Thus, PLLA and PDLA are ideal polymers for the study of the extrinsic Cotton effect or induced Cotton effect involving the interaction of helical polymer structure in solution with a guest molecular chromophore hosted inside the spiral pitches or intercalated between the PLLA helices. The guest symmetric molecule without ORD signal, by interacting with the asymmetric helical structure of PLLA, gives rise to an induced ORD signal in correspondence of its electronic transition in the visible through the coupled oscillator mechanism or the one-electron mechanism or exciton coupling [21][22][23][24][25]. In other words, the electronic transition of the chromophore of the guest molecule has a spatial relationship with host macromolecule which is manifested as a dissymmetry in the ORD spectrum of the complex [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…The guest symmetric molecule without ORD signal, by interacting with the asymmetric helical structure of PLLA, gives rise to an induced ORD signal in correspondence of its electronic transition in the visible through the coupled oscillator mechanism or the one-electron mechanism or exciton coupling [21][22][23][24][25]. In other words, the electronic transition of the chromophore of the guest molecule has a spatial relationship with host macromolecule which is manifested as a dissymmetry in the ORD spectrum of the complex [21][22][23][24][25]. The induced Cotton effect was indeed detected by ORD spectroscopy both in solutions of PLLA/iodine [26] and PLLA/C 60 fullerene [27], whereas a charge-transfer host-guest interaction was measured in both cases.…”

Section: Introductionmentioning

confidence: 99%

On the Optical Activity of Poly(l-lactic acid) (PLLA) Oligomers and Polymer: Detection of Multiple Cotton Effect on Thin PLLA Solid Film Loaded with Two Dyes

Cataldo¹

2020

IJMS

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Optical rotatory dispersion (ORD) is a beautiful analytical technique for the study of chiral molecules and polymers. In this study, ORD was applied successfully to follow the degree of polycondensation of l-(+)-lactic acid toward the formation of poly(lactic acid) oligomers (PLAO) and high molecular weight poly(l-lactic acid) (PLLA) in a simple esterification reaction equipment. PLLA is a biodegradable polymer obtainable from renewable raw materials. The racemization of the intrinsically isotactic PLLA through thermal treatment can be easily followed through the use of ORD spectroscopy. Organic or molecular electronics is a hot topic dealing with the combination of π-conjugated organic compounds and polymers with specific properties (e.g., chirality) which can be exploited to construct optoelectronic devices, such as organic light-emitting diodes (OLEDs), organic photovoltaic (OPV) high efficiency cells, switchable chirality devices, organic field-effect transistors (OFETs), and so on. ORD spectroscopy was applied to study either the gigantic optical rotation of PLLA films, as well as to detect successfully the excitonic coupling, occurring in thin solid PLLA green film loaded with a combination of two dyes: SY96 (a pyrazolone dye) and PB16 (the metal-free phthalocyanine pigment). The latter compound PLLA loaded with SY96 and PB16 shows a really gigantic optical activity in addition to typical ORD signal due to exciton coupling and may be considered as a simple and easily accessible model composite of a chiral polymer matrix combined with π-conjugated dyes for molecular electronics studies.

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“…Electron-acceptor polymers have been the subject of considerable interest in the field of electrophotography for at least the last 20 years because of their electron transporting characteristics under an applied electric field.1-3 However, few examples of these electronacceptor polymers have been reported to date. [4][5][6][7][8][9] The reasons are obvious. Most of conventional polymerization methods (such as cationic, anionic, and free-radical polymerization) become problematic in the presence of a strong electron acceptor, e.g., nitro aromatic groups such as a 2,4,7-trinitrofluorenone (TNF) group, a 3,5dinitrobenzoyl (DNB) group, etc.…”

mentioning

confidence: 99%