ZfN: Search Results

1	Author	Ludwig Holleck, Gholamali Kazemifard	Requires cookie*
	Title	Salzbildung der Diazoaminobenzole (Triazene) im Zuge der Elektrolyse in aprotischem Lösungsmittel Salt Formation during Electrolysis of Diazoaminobenzenes (Triazenes) in Aprotic Solvent
	Abstract	In contrast to aqueous and methanolic solutions the polarographic reduction of diazoamino-benzenes (DAAB) in the aprotic solvent dimethylformamid occurs in two waves with the combined hight corresponding to a four electron reduction. The first wave results from the four electron reduction of the fraction (1/5) of the DAAB molecules which obtain the necessary protons from the remaining (4/5) DAAB molecules. The resulting DAAB anions are only reduced at the considerably more negative potentials of the second wave. Then the reduction occurs also in a four electron step and leads to the cleavage of the molecule. Potentiostatic electrolysis at the limiting current region of the first polarographic wave results in coloured solutions. The colour depends on the nature of the substituent. Salt formation was monitored spectrophotometrically and inferences pertaining to structure are drawn. The experimental results show that mercury compounds which might possibly be formed as inter-mediary species react immediately with the cations of the supporting electrolyte to form the cor-responding DAAB salts.
	Reference	(Z. Naturforsch. 27b, 1166—1169 [1972]; eingegangen am 22. März/17. Juli 1972)
	Published	1972
	Keywords	Polarography, Diazoaminobenzenes, Salt formation, Dimethylformamide
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	TEI-XML for	default:Reihe_B/27/ZNB-1972-27b-1166.pdf
	Identifier	ZNB-1972-27b-1166
	Volume	27

2	Author	J. Markopoulos, D. Jannakoudakis	Requires cookie*
	Title	Über die inhibierende Wirkung grenzflächenaktiver Stoffe auf die polarographische Reduktion von Cd 2+ -, Zn 2+ -und Co 2+ -Ionen in wasser-methanolischen und methanolischen Lösungen On the Inhibition Effect of Surfactants on the Polarographic Reduction of Cd 2+ , Zn 2+ and Co 2+ Ions in Aqueous Methanolic and Methanolic Solutions
	Abstract	The inhibition effect of tri-n-octylphosphine oxide (TOPO), triphenylarsine oxide (TAsO), triphenylphosphine oxide (TPO), triphenylarsine (TPAs) and triphenylphosphine (TPP) on the polarographic reduction of Cd 2+ , Zn 2+ and Co 2+ ions in aqueous methanolic and methanolic solutions has been studied.
	Reference	Z. Naturforsch. 36b, 1089—1092 (1981); eingegangen am 18. Mai 1981
	Published	1981
	Keywords	Polarography, Inhibitors, Electroreduction, Triphenylarsine Oxide
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	TEI-XML for	default:Reihe_B/36/ZNB-1981-36b-1089.pdf
	Identifier	ZNB-1981-36b-1089
	Volume	36

3	Author	Dimitrios Jannakoudakis, Elli Theodoridou	Requires cookie*
	Title	Über den Einfluß des pH-Wertes auf die polarographische Reduktion der Nitrophenole mit und ohne Zusatz von Campher On the Influence of the pH Value on the Polarographic Reduction of the Nitrophenols in Presence and Absence of Campher
	Abstract	The Polarographie behavior of the nitrophenols in the pH range 1-13 and the in-fluence of campher on the polarographic curves are studied. The pH dependence of the half wave potentials and the different reduction of the depolarizers in their molecular or anionic form are discussed.
	Reference	Z. Naturforsch. 35b, 705—708 (1980); eingegangen am 8. Februar 1980
	Published	1980
	Keywords	Nitrophenols, Polarography, Half Wave Potential, Inhibitor
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	TEI-XML for	default:Reihe_B/35/ZNB-1980-35b-0705.pdf
	Identifier	ZNB-1980-35b-0705
	Volume	35