Novel dihydrazone based polymers for electrophotography

Getautis, Vytautas; Gražulevičius, J.V.; Daškevičienė, Marytė; Malinauskas, Tadas; Jankauskas, Vygintas; Sidaravičius, Jonas; Undzenas, A.

doi:10.1016/j.eurpolymj.2007.04.044

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…The chemistry of hydrazones and their metal complexes has long been an area of active interest, because of their properties appropriate for their applications in, for example, sensors, non-linear optical and polymeric materials [1][2][3][4][5][6] and their biological applications. [7][8][9][10] Within supramolecular chemistry, Lehn has incorporated hydrazone units into pyrimidine-and pyridine-containing molecular strands that undergo programmed self-organization into metal-free helical architectures [11][12][13] and metal-containing helical wires [14,15] or grid-like arrays.…”

Section: Introductionmentioning

confidence: 99%

4′‐Hydrazone Derivatives of 2,2′:6′,2"‐Terpyridine: Protonation and Substituent Effects

et al. 2008

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Four 4′‐hydrazone derivatives of 2,2′:6′,2"‐terpyridine which vary in their N‐ and C‐substitution in the R′NN=CRPh unit have been prepared and structurally characterized. Protonation studies and solution behaviour of these compounds are described, as well as representative crystal structures of mono‐ and diprotonated derivatives. In the solid‐state structures of each neutral compound, the tpy domain adopts the anticipated trans,trans‐conformation, and intramolecular steric factors compete with π‐stacking effects to control the amount to which the C‐phenyl substituent twists out of the plane of the tpy unit. When R′ = H, the imine NH group engages in hydrogen bonding interactions in the solid state, except where R = Ph. In solution, variable temperature 1H NMR spectroscopy shows that on going from R = Me to Ph (with R′ = H), the barrier to rotation about the Cpy–Nimine bond increases; with R = R′ = H, the hydrogen bonding capabilities of the solvent to the imine NH influence this dynamic process. In the N‐methyl derivative (R = H and R′ = Me), rotation about the Cpy–Nimine bond is facile at room temperature. Protonation of the derivative with R = R′ = H results in an increase in the activation barrier to rotation, consistent with a greater π‐contribution to the Cpy–Nimine bond. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

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Section: Introductionmentioning

confidence: 99%

4′‐Hydrazone Derivatives of 2,2′:6′,2"‐Terpyridine: Protonation and Substituent Effects

et al. 2008

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“…However, UV spectra of polymer 4 exhibit higher values of molar extinction coefficient. They are apparently influenced by the absorption of the fragments of 4,4′‐thiobisbenzenethiol in the range of 220–280 nm due n → σ* transition of sulfur electrons 13…”

Section: Resultsmentioning

confidence: 99%

“…These are relatively high hole mobilities as for nonconjugated polymer semiconductor, the possibilities of purification of which are rather limited. The polymers of the similar structure containing hydrazone moieties in the main chain earlier synthesized by polyaddition of 4,4′‐thiobisbenzenethiol with the corresponding diepoxy monomers exhibited the similar or even slightly superior charge‐transport properties 13, 19. However, the thermal and photochemical stability of aromatic amines and their derivatives is usually considerably higher than that of hydrazones.…”

Section: Resultsmentioning

confidence: 99%

Percutaneous retrieval of the locked helex septal occluder

Poommipanit¹,

Levi

Shenoda

et al. 2011

Cathet Cardio Intervent

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The HELEX device is approved for percutaneous closure of an atrial septal defect (ASD). It is also often used off-label to close patent foramen ovale (PFO). The device is well tolerated because it is very flexible, but this characteristic increases the likelihood of embolization of locked implants. While the company provides a mechanism to retrieve devices that do not lock correctly, retrieval of locked and released devices is much more difficult. A case of percutaneous retrieval of an embolized, locked HELEX device is reported. This device was successfully retrieved from the aorta by snaring the left atrial eyelet and unlocking the device. A variety of potential techniques for retrieval of these devices was explored on the bench top. Strategies which can be used to successfully retrieve embolized HELEX devices are described.

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“…Bis(4-hydrazinophenyl)sulfone was also used for the synthesis of hydrazone main chain polymers. 50,51 Diepoxy monomers were synthesized as shown in Scheme 16.…”

Section: Scheme 12mentioning

confidence: 99%

Hole-transporting hydrazones

2008

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This tutorial review covers recent contributions in the area of hole-transporting hydrazones, which are widely used in optoelectronic devices. It is addressed to students and researchers interested in the synthesis and properties of organic electroactive materials. The thermal, charge transport and other properties of electroactive hydrazones are compared and the relationships between the molecular structures and properties are emphasized. The first part discusses the low-molar-mass hydrazones and presents examples of their synthetic routes and chemical structures. In the second part, polymeric arylaldehyde hydrazones containing hydrazone moieties as the side substituents and in the main-chain are described.

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Novel dihydrazone based polymers for electrophotography

Cited by 11 publications

References 12 publications

4′‐Hydrazone Derivatives of 2,2′:6′,2"‐Terpyridine: Protonation and Substituent Effects

4′‐Hydrazone Derivatives of 2,2′:6′,2"‐Terpyridine: Protonation and Substituent Effects

Percutaneous retrieval of the locked helex septal occluder

Hole-transporting hydrazones

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