Wasserphotolyse mit Hilfe von funktionellen Tris-(2,2′-bipyridin)ruthenium(II)-Komplexen

19 Tris(2,2-bipyridyl)ruthenium(II) complexes with functional groups were synthesized and investigated as sensitizers in photochemical hydrogen production by visible light with the four component system Ru(bipy) ₃ ²⁺ , methylviologen, ethylenediamintetraacetic acid and colloidal platinum ruthenium-bipyridine complexes with electron accepting groups, e.g. halogen or carboxylate were found to be most effective in hydrogen generation.

Herrn Prof. Dr. mult.Viktor Gutmann zum 65. Geburtstag gewidmet.     

Synthesis, Properties, and Crystal and Molecular Structures of New Ni(II) Complexes with Sterically Hindered Methoxy-β-iminoketones

This paper describes a procedure for the synthesis of two new volatile complexes, C₂₂H₄₀N₂NiO₄ and C₂₀H₃₆N₂NiO₄, based on sterically hindered methoxy--iminoketones. The compounds were investigated by IR spectroscopy and DTA. Full crystal-chemical analysis has been carried out. The structures are molecular. The complexes have close geometrical characteristics; the distances are Ni–O 1.826 and Ni–N 1.842 ; the O–Ni–N chelate angle is 93.2°. The complexes have an intramolecular hydrogen bond N–H...O, estimated at 2.54 (2.08) . In both structures, the packing of complexes is similar to that in nickel(II) dipivalylmethanate.     

Photometric determination of molybdenum in iron and steels using tin(II) chloride in nonaqueous solvent

Summary A new procedure is proposed for the photometric determination of molybdenum in iron and steels using thiocyanate and tin(II) chloride solution [in glycerol-ethannol (31) or in diethylenglycol] as a reducer and extraction with n-butyl acetate. Beer's law is obeyed between 0.2 and 80 g Mo/ml. The minimum photometric error is 3.2%, the molar absorptivity is 15640 at 470 nm and the best concentration range for determination is between 0.6 and 6 g Mo/ml.

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Photometrische Bestimmung von Molybdän in Eisen und Stahl mit Hilfe von Zinn(II)-chlorid in nichtwärigem Medium

Zusammenfassung Das vorgeschlagene Verfahren beruht auf Bildung des Thiocyanatkomplexes unter Verwendung von Zinn(II)-chlorid als Reduktionsmittel [in Glycerin/Äthanol (31) oder Diäthylenglykol]. Als Extraktionsmittel dient n-Butylacetat. Das Beersche Gesetz wird im Bereich 0,2–80 g Mo/l befolgt. Der kleinste photometrische Fehler beträgt 3,2%, die molare Extinktion 15640 bei 470 nm und der optimale Konzentrationsbereich 0,6–6 gMo/l.

Lecture presented at Euroanalysis I Conference, 28. 8. –1. 9. 1972 in Heidelberg, Germany.