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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 1142-1147 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of the Dibenzo[c.h]phenothiazinyl RadicalThe stable free title radical 2 is obtained from 7H-dibenzo[c.h]phenothiazine (1) by dehydrogenation with yellow HgO. For 2 a free radical content of 64% in solution (room temperature) and 6% in the crystalline state has been determined by e.s.r. The complex e.s.r. spectrum of 2-solutions is discussed in connection with Hückel calculations. A 1:1-adduct of 1 and 2 in the crystalline state exhibit a radical content of 72% (referred to 2). 2 and the formerly described dinaphtho[2.3-c : 2′.3′hyphen;h]phenothiazinyl (5) display characteristic u.v. spectra.
    Notes: 7H-Dibenzo[c.h]phenothiazin (1) liefert bei der Dehydrierung mit gelbem HgO das stabile freie Titel-Radikal 2. Der Radikalgehalt (Raumtemperatur) beträgt nach ESR-Messungen in Lösung 64%, im Kristall 6%. Das linienreiche Lösungs-ESR-Spektrum wird im Zusammenhang mit Hückel-Rechnungen diskutiert. Ein 1:1-Addukt von 1 und 2 weist (im Kristall) einen Radikalgehalt von 72% (bezogen auf 2) auf. 2 und das früher beschriebene Dinaphtho-[2.3-c : 2′.3′-h]phenothiazinyl1) (5) zeigen charakteristische UV-Spektren.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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