Research in the 2,5-diaryl-1,3,4-oxadiazole series. 1. Electronic structures and spectral-luminescence properties of substituted 2,5-diphenyl-1,3,4-oxadiazoles

Попова, Н. А.; Yushko, E. G.; Krasovitskii, B. M.; Lyubarskaya, A. E.; Goldberg, Moshe

doi:10.1007/bf00512808

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…Using a weak electron donor amide group in the meta position to the side unit (acting as acceptor in meta-position 36 ), the PL maximum is red shifted compared with that of the stronger electron donor oxygen in the meta and ortho positions. 36 The same effect is already known for low molar mass diphenyl-1,3,4-oxadiazole substituted in the para position 33,35 . In contrast, the influence of the silicon or hexafluoropropylidene groups, which improve the solubility, is negligible.…”

Section: Resultssupporting

confidence: 62%

“…The low molar mass compounds are able to transport holes as well as electrons 34 and show an intensive fluorescence. 35 The polymers IVa, IVc, Va, and Vc show intensive blue emission with the maximum between 460 and 480 nm (Table II). In contrast to other diphenyloxadiazole side chain polymers, such as polymethylmethacrylate derivatives, 10,11,33 parts of the main chain in the polymers in this study are conjugated, which influences the luminescent behavior.…”

Section: Resultsmentioning

confidence: 98%

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Synthesis and study of new polyamides with side oxadiazole rings

Brumă¹,

Hamciuc²,

Schulz

et al. 2002

J of Applied Polymer Sci

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A series of six new aromatic polyamides with side oxadiazole rings has been synthesized by polycondensation reaction of aromatic diamines containing pendent substituted oxadiazole groups with a silicon-containing diacid chloride [namely, bis(p-chlorocarbonyl-phenylene)diphenylsilane] or with a fluorine-containing diacid chloride [namely, hexafluoroisopropylidene-bis(p-benzoyl chloride)]. All polymers were easily soluble in amidic solvents, such as N-methylpyrrolidinone and dimethylformamide, and gave thin transparent films by casting such solutions. Very thin coatings were deposited onto silicon wafers and exhibited smooth, pinhole-free surfaces in atomic force microscopy investigations. The polymers showed high thermal stability, with decomposition temperature Ͼ400°C. Some of them did exhibit a glass transition, in the range 152-276°C, with a reasonable interval between glass transition and decomposition. Four of these polymers showed blue photoluminescence, in the range 460 -480 nm, which makes them promising candidates for future use as high-performance materials in the construction of light-emitting devices.

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Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 98%

Synthesis and study of new polyamides with side oxadiazole rings

Brumă¹,

Hamciuc²,

Schulz

et al. 2002

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Using a weak electron donor amide group in the meta-position to the side unit (acting as acceptor in meta-position [62]) the photoluminescence maximum is red-shifted compared with that of the stronger electron donor oxygen in the meta and orto positions. The same effect is known for low molar mass diphenyl-1,3,4-oxadiazole substituted in the para-position [52,63]. The influence of silicon group is negligible.…”

Section: Polymers With Oxadiazole Rings In the Side Chainsupporting

confidence: 56%

“…The maxima and the half width of the photoluminescence curves are also shown in Table 3. The absorption maximum of these polymers is mainly determined by the diphenyl-1,3,4-oxadiazole unit, because the unsubstituted diphenyl-1,3,4-oxadiazole in hexane shows its absorption maximum at 284 nm [52,53]. However, in polymers the absorption is slightly red-shifted to about 300 nm.…”

Section: IImentioning

confidence: 99%

Silicon-containing polyoxadiazoles—synthesis and perspectives

Brumă¹,

Köpnick²

2005

Advances in Colloid and Interface Science

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“…From previous investigations,33 we concluded that the polymers containing the dimethylamino substituent in the para position of the chromophoric diphenyl‐1,3,4‐oxadiazole unit ( IVa , IVc , Va , and Vc) are the most promising candidates for emissive materials in light‐emitting devices LEDs. The low molar mass compounds are able to transport holes as well as electrons34 and show an intensive fluorescence 35. The polymers IVa , IVc , Va , and Vc show intensive blue emission with the maximum between 460 and 480 nm (Table II).…”

Section: Resultsmentioning

confidence: 99%

Ultrafractionation in human malignant glioma xenografts

Krause

Joiner

Baumann

2003

Intl Journal of Cancer

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A series of six new aromatic polyamides with side oxadiazole rings has been synthesized by polycondensation reaction of aromatic diamines containing pendent substituted oxadiazole groups with a silicon‐containing diacid chloride [namely, bis(p‐chlorocarbonyl‐phenylene)diphenylsilane] or with a fluorine‐containing diacid chloride [namely, hexafluoroisopropylidene‐bis(p‐benzoyl chloride)]. All polymers were easily soluble in amidic solvents, such as N‐methylpyrrolidinone and dimethylformamide, and gave thin transparent films by casting such solutions. Very thin coatings were deposited onto silicon wafers and exhibited smooth, pinhole‐free surfaces in atomic force microscopy investigations. The polymers showed high thermal stability, with decomposition temperature >400°C. Some of them did exhibit a glass transition, in the range 152–276°C, with a reasonable interval between glass transition and decomposition. Four of these polymers showed blue photoluminescence, in the range 460–480 nm, which makes them promising candidates for future use as high‐performance materials in the construction of light‐emitting devices. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 714–721, 2003

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Research in the 2,5-diaryl-1,3,4-oxadiazole series. 1. Electronic structures and spectral-luminescence properties of substituted 2,5-diphenyl-1,3,4-oxadiazoles

Cited by 10 publications

References 11 publications

Synthesis and study of new polyamides with side oxadiazole rings

Synthesis and study of new polyamides with side oxadiazole rings

Silicon-containing polyoxadiazoles—synthesis and perspectives

Ultrafractionation in human malignant glioma xenografts

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