Nachtrag zu «Ein Verfahren zur Stabilitätsfrage bei Matrizen-Eigenwertproblemen»

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Transient processes in photogalvanic cells: Part II. The ru (bipy)32+/Fe3+ cell

The transient processes in photogalvanic cells using the ^*Ru(bipy)₃²⁺+Fe³⁺→Ru(bipy)₃³⁺+Fe²⁺ system are investigated by measurement of the current-time and the potential-time characteristics. Under conditions of high light intensity and low to medium workloads of the cell, a pronounced maximum in the voltage-time curve is observed. This maximum appears after some milliseconds and it amounts to four times the stationary value. The experimental results are explained and the transients simulated, using the theoretical model developed in Part I of this series.     

Nachweis von37Ar und81Kr in atmosphärischem Ar und Kr

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Synthesis and Conformation of (5R,8R,10R)-8-(Methylthiomethyl)ergoline-6-carboxamidine

The title compound 7 and two related novel ergolines have been synthesised from (5R,8R,10R)-8-(methyl-thiomethyl)ergoline-6-carbonitrile ( 4 ). The guanidine function of 7 induces a boat conformation of ergoline-ring D, as demonstrated by a careful NMR spectroscopic analysis of 7 and its N-hydroxy congener 6 . Diphenylphosphinodithioic acid has been used to convert the cyanamide function of 4 into the thiourea function at (5R,8R,10R)-8-(methylthiomethyl)ergoline-6-thiocarboxamide ( 5 ).