| | 1 | Author
| D. Irk Johrendt, R. Einer, M. Iericke, A.Lbrecht Mewis | Requires cookie* | | | Title
| Neue Pnictide mit modifizierten A1B2-Strukturen New Pnictides with M odified A1B2-Type Structures  | | | | Abstract
| Nine new compounds A M X with A: Ca, Sr, Ba, M: Pd, Au and X : P, As were prepared by heating mixtures of the elements and investigated by X-ray methods. They crystallize in modified A1B2-type structures, for the present examples in the ZrBeSi-and SrPtSb-types, with an ordered distri bution of the atoms. | | | |
Reference
| Z. Naturforsch. 51b, 905—906 (1996); eingegangen am 6. November 1995 | | | |
Published
| 1996 | | | |
Keywords
| Ternary Pnictides, Alkaline Earth Metals, Palladium, Gold, Crystal Structure | | | |
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| | | | | TEI-XML for
| default:Reihe_B/51/ZNB-1996-51b-0905_n.pdf | | | | Identifier
| ZNB-1996-51b-0905_n | | | | Volume
| 51 | |
| 2 | Author
| A. Kondoh, T. Oi | Requires cookie* | | | Title
| Interaction of Alkaline Earth Metal Ions with Acetic and Lactic Acid in Aqueous Solutions Studied by 13 C NMR Spectroscopy | | | | Abstract
| Interaction of alkaline earth metal (magnesium, calcium, strontium and barium) ions with acetic and lactic acid in aqueous media was investigated by 13 C NMR spectroscopy. In the acetate systems, signals whose chemical shifts were the averages of those of the free and bound acetate ions were observed. Downfield shifts of the carboxylate carbon signals with increasing metal ion concentration indicated that the acetate ion acted as a monodentate ligand coordinating to the metal ion using the carboxylate group. The metal ion concentration dependence of the peak positions of the methine and carboxylate carbon signals of the lactate ion in the lactate systems suggested that the lactate ion coordinated to a metal ion using the carboxylate and hydroxyl groups. Unique upfield shifts upon complexation in the magnesium lactate systems suggested that the lactate ion coordinated to the magnesium ion from outside the primary hydration sphere. The present results were consistent with the isotope effects of the alkaline earth metals observed in cation exchange chromatography. | | | |
Reference
| Z. Naturforsch. 52a, 351—357 (1997); received December 4 1996 | | | |
Published
| 1997 | | | |
Keywords
| 13 C NMR, Alkaline Earth Metals, Acetic Acid, Lactic Acid, Isotope Effects | | | |
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| default:Reihe_A/52/ZNA-1997-52a-0351.pdf | | | | Identifier
| ZNA-1997-52a-0351 | | | | Volume
| 52 | |
| 3 | Author
| Akiko Kondoh, Takao Oi | Requires cookie* | | | Title
| Interaction of Alkaline Earth Metal Ions with Carboxylic Acids in Aqueous Solutions studied by 13 C NMR Spectroscopy | | | | Abstract
| 1? C NMR spectroscopic measurements of aqueous solutions containing alkaline earth metal chloride and a carboxylic acid have been carried out to acquire some insight into the coordination manners of various carboxylic acids to alkaline earth metal ions. The dependence of the l 3 C NMR signal positions of the carboxylate carbons on the magnesium ion concentration in a magnesium carboxylate system is a good index to understand the coordination manner of the carboxylate ion. The upfield shift of the car-boxylate carbon signal with increasing magnesium ion concentration indicates that the carboxylate ion acts as a bidentate ligand to form a ring structure. Only in the citrate systems, the existence of a rela-tively stable complex is evidenced in which the citrate ion is expected to act as a tridentate ligand. | | | |
Reference
| Z. Naturforsch. 53a, 77—91 (1998); received December 30 1997 | | | |
Published
| 1998 | | | |
Keywords
| 13 C NMR Spectroscopy, Carboxylic Acids, Alkaline Earth Metals, Coordination, Chemical Shifts | | | |
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| default:Reihe_A/53/ZNA-1998-53a-0077.pdf | | | | Identifier
| ZNA-1998-53a-0077 | | | | Volume
| 53 | |
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