p-ターフェニル 化学特性,用途語,生産方法
外観
白色～わずかにうすい緑色又はうすい黄色、結晶～結晶性粉末
溶解性
クロロホルムに溶け、水に難溶である。
用途
オルト、メタ、パラの3種類の異性体が存在する。市販グレードのテルフェニルは、通常3つの異性体の混合物である。この混合物は、かつて熱貯蔵や熱伝導剤として用いられていたポリ塩化テルフェニルの製造の原料となる。
p-テルフェニルはもっとも一般的な異性体で、レーザー色素やサンスクリーン剤の原料として用いられる。
使用上の注意
アルゴン封入
説明
p-Terphenyl(PTP) is an aromatic hydrocarbon isomer, formed by three benzene rings in ortho position. Pure terphenyl is a white crystalline solid, insoluble in water. Though polychlorinated terphenyls were used as heat storage and transfer agents, p-terphenyl is currently under investigation as a material to be used in opto-electronic devices, such as organic LED devices (OLEDs) and currently used in laser dyes and sunscreen lotions. In particle physics it has been used as a wavelength shifter, exploiting its sensitivity to VUV radiation, to read out scintillation light from liquid Xenon. Pterphenyl has also been used as a doping component for liquid scintillators.
So far, p-terphenyl has not been used as main component of particle detectors due to its short Light Attenuation Length. As a matter of fact this property could be exploited when detecting low-energy charged particles in small areas, providing both energy and position measurement.
化学的特性
a White or light-yellow solid. The melting point is 213°C, boiling point is 383°C, 250°C (6kPa), flash point is 207°C, and relative density is 1.234 (0°C). Soluble in hot benzene, slightly soluble in ether and carbon disulfide, extremely insoluble in ethanol and acetic acid. 427℃ sublimation. p-Terphenyl can be separated from the by-products of biphenyl production.
使用
p-Terphenyl is a specialty material, and may be used in ionized radiation detectors, nonpolar laser dye, and single molecule optical probe of scanning near-field microscopy.
定義
Most of the natural terphenyls are p-terphenyls which consist of a C-18 tricyclic or polycyclic C-18 aromatic skeleton. The chemical investigation of p-terphenyls as one class of the pigments of mushrooms was traced back to 1877. So far, most natural p-terphenyl derivatives have been isolated from basidiomycete macrofungi, while few of them have been reported from endolithic fungi, actinomycetes, and moss. These types of compounds were found to have a broad spectrum of biological effects including immunosuppressive, antioxidative, neuroprotective, antimicrobial, and cytotoxic activities. The fact that some popular edible mushrooms such as Thelephora aurantiotincta, T. ganbajun, and Sarcodon leucopus are rich in p-terphenyls supports the usage of this class of natural products as food supplements to improve human health[1-2].
定義
ChEBI: p-Terphenyl is a para-terphenyl that consists of benzene attached to two phenyl units at positions 1 and 4 respectively.
主な応用
LCD Electronics: P-Terphenyl is one of the basic intermediates for preparing diphenyl LCD materials at present.
Organic synthesis: P-Terphenyl is the basic raw material for synthesizing antifungal cyclic peptide (4-carboxyl P–Terphenyl CTP) and diphenyl polyamide material 4, 4-（DCTP).
Fine chemical engineering: under radiation, P-Terphenyl will generate fluorescence, and thus it can be used as an organic scintillation reagent. It is used as an illuminant in scintillation counters and as a synthetic intermediate for laser dyes.
p-Terphenyl-Sensitized Photoreduction of CO2 with Cobalt and Iron Porphyrins. Interaction between CO and Reduced Metalloporphyrins
一般的な説明
White or light-yellow needles or leaves. Mp: 212-213°C; bp 376°C. Density: 1.23 g cm-3. Insoluble in water. Soluble in hot benzene. Very soluble in hot ethyl alcohol. Usually shipped as a solid mixture with its isomers o-terphenyl and m-terphenyl that is used as a heat-transfer fluid.
反応プロフィール
p-Terphenyl is non-flammable but combustible (flash point: 410°C). Extremely stable thermally. Incompatible with strong oxidizing agents but not very reactive at room conditions.
危険性
Toxic by ingestion and inhalation. Eye and
upper respiratory tract irritant.
安全性プロファイル
Moderately toxic by ingestion. Combustible when exposed to heat or flame. To fight fire, use water, CO2, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes.
純化方法
Crystallise p-terphenyl from nitrobenzene or trichlorobenzene. It is also purified by chromatography on alumina in a darkened room, using pet ether, and then crystallising from pet ether (b 40-60o) or pet ether/*benzene. It is a fluorophore for scintillation counting and has ex 286nm : em 343nm in DMF, and max 277nm (log 4.50). [Beilstein 5 IV 2483.]
p-ターフェニル 上流と下流の製品情報
原材料
準備製品