Reference

Preparation of a variety of polymeric conductors from diacetylenes

Preparation of a variety of polymeric conductors from diacetylenes. Nakanishi, H.; Matsuda, H.; Kato, M. (Res. Inst. Polym. Text., Tsukuba 305, Japan). Mol.Chemicals with cas numbers 27987-87-7 and 7783-70-2 also play role. Cryst. Liq. Cryst., 105(1-4), 77-88 (English) 1984. CODEN: MCLCA5. ISSN: 0026-8941. DOCUMENT TYPE: Journal CA Section: 76 (Electric Phenomena) Section cross-reference(s): 35 Several different structures of conducting polymers were synthesized from diacetylenes including nonsubstituted polyacetylene, i.e. butadiyne. Semiconducting polymer single crystals were obtained by thermally or g-ray induced doping-polymn. of the diacetylenes, where chem. doping was accomplished before the rigid polymer crystal lattice was formed. Conductivities attained were 10-4~-7 S/cm, depending on the compd. (2,4-hexadiyne-1,6-diol p-toluenesulfonate, 1,6-dicarbazolyl-2,4-hexadiyne) and dopant (I, SbF5, AgClO4, FeCl3, SO3). The doping-polymn. method was applicable also for semiconducting thin-layer formation. g-Ray-induced post-polymn. of butadiyne in the solid-state explosively produced a C-like polymer with a cond. of 10-2 S/cm, whereas spontaneous polymn. of butadiyne in soln. gave a sol. brownish polymer whose cond. increased up to 10-4 S/cm upon I doping. Oxidative coupling of butadiyne in soln. resulted in the formation of a black powdery polymer. The cond. of the poly-yne was improved from 10-11 to 10-4 S/cm by I doping. Two kinds of metal-contg. polymers were obtained by the reaction of butadiyne with metal halides in basic soln. Upon I doping, conductivities of the pelletized butadiyne-Cu polymers were enhanced up to the order of 101 S/cm. Temp. dependence verified metallic conduction, and no metal-insulator transition was obsd. down to 7 K. .

Cracking of 2,2,4-trimethylpentane in superacid media hydrogen fluoride-antimony(V) fluoride

Cracking of 2,2,4-trimethylpentane in superacid media hydrogen fluoride-antimony(V) fluoride. Fabre, Paul Louis; Bedioui, Fethi; Devynck, Jacques; Tremillon, Bernard (Ec. Natl. Super. Chim., Univ. Pierre-et-Marie-Curie, Paris 75231, Fr.). Nouv. J. Chim., 7(7), 409-11 (English) 1983. CODEN: NJCHD4. ISSN: 0398-9836. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Section cross-reference(s): 51, 72 Voltammetric curves of anodic oxidn. 89109-54-6 and 7783-70-2 are also in the experiment. showed that the title reaction involved oxidn. by H+ to give isobutane. The apparent rate const. for this protolysis was detd. The b-cleavage of Me3CCH2C+Me2 was demonstrated by the acid-base titrn. of SbF5 by Me3CCH2CMe:CH2. .