Synthesen, Konstitutionsaufklärung, Röntgenstrukturanalyse und elektrische Eigenschaften von Di‐ und Polychalkogendiimiden, 1. Mitteilung

Abstract

Es wird iiber Darstellung, chernische und spektroskopische Eigenschaften von 2b, 3a, b, 4a, b, 5a, b, 7a, b, 8a, 9a, 10a berichtet; die Ergebnisse der rontgenstrukturanalytischen Untersuchungen von 2a und 2b sowie die Ergebnisse der Untersuchungen uber die elektrische Leitfahigkeit von 2a, 2b, 7a und 7 b werden ebenfalls rnitgeteilt. Seit rnehreren Jahren beschaftigen wir uns1-13) rnit Synthesen und rnit den chernischen und physikalisch-chernischen Eigenschaften neuer S"-und S'"-N-Bindung~systerne~~~).Irn Rahrnen solcher Untersuchungen uber Di-und Polychalkogendiirnide, die irn Hinblick auf eine rnogliche neue Klasse von organischen elektrischen Leitern rnit gerichteter Leitfahigkeit interessant sein durftenls), berniihen wir uns, neue Molekiilsysterne zu synthetisieren, ihre Bindungsverhaltnisse sowie ihre elektrische Leitfahigkeit zu studieren. Irn folgenden wird uber Synthesen neuer Mono-und Dichalkogendiimide rnit Chinongeriist sowie einiger charakteristischer Derivate und ihre chemischen und physikalischen Eigenschaften berichtet.

Novel Organic Semiconductor BTQBT with High Conductivity and High Mobility

“…BTQBT was obtained in 48% yield by a Wittig-Horner reaction of a 2-methylphosphonol,3-dithiole [1] with 4H,8H-benzo[1,2-c;4,5-c']bis [1,2,5]thiadiazole--4,8-dione [2]. BTQBT has a high melting point (> 450°C) and is sublimed at 350°C/0.1 torr.…”

Size dependent electrochemical properties of reduced graphite oxide

“…In the high concentration of hydrazine the peaks become one peak near 25° (Figure 1d), indicating considerable reduction due to the high concentrated hydrazine [12]. The two phases in XRD of the low hydrazine treated samples (A5 and A149) compared to the high hydrazine treated samples (B5 and B149) indicate that some functional groups still existed between the layers even after the reduction processes, and it will be described more with FTIR results later.…”

Product Class 27: Selenazoles and Tellurazoles Containing One or More Other Heteroatoms

“…The major product 83, whose structure has been proved by X-ray diffraction, obviously results from oxidative cleavage of the pyrimidinone ring with loss of C2 (Scheme 48). [68][69][70] The use of 2,1,3-benzoselenadiazoles in this way is described in detail in a review [71] which also contains a useful compilation of fully assigned 1 H, 13 C, and 77 Se data for such compounds. Also obtained was the byproduct 84; yield: 31%; mp 195-196 8C.…”

“…[7] The product 11 may be considered to exist both in the selenium(II) quinonoid form 10 and in the selenium(IV) benzoxaselenazole form 11. The resulting product was collected by filtration and recrystallized (MeOH, 2 10 mL) to give the product 11 as orange-red needles; yield: 0.70 g (11%); mp 133 8C; 77 Se NMR (ä, relative to external SeOCl 2 ) 77. [7] Scheme 5 Synthesis of a Benzoxaselenazole [7] 4,6-Di-tert-butyl-2-chloro-1,2º 4 ,3-benzoxaselenazole (11): [7] A soln of 2,4,6-tri-tert-butylaniline (9; 5.0 g, 19.1 mmol) in toluene (80 mL) was stirred at rt while a soln of SeOCl 2 (6.34 g, 38.2 mmol) in toluene (20 mL) was added.…”