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Notizen 251 Magnesium Anthranilate Dihydrate Frank Wiesbrock, Annette Schier, and Hubert Schmidbaur* Anorganisch-chemisches Institut, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany Reprint requests to Prof Dr. H. Schmidbaur. E-mail: H.Schmidbaur@lrz.tum.de Z. Naturforsch. 57b, 251Ð254 (2002); received January 11, 2002 Magnesium, Hexa(aquo) Complex of Magnesium, Anthranilate Anion The reaction mixture of magnesium chloride with two equivalents of potassium anthranilate [K+ AnthÐ] in water gives on cooling to 0 ∞C a 60% yield of a

Magnesium. — Vorkommen. — Geschichtliches. 189 M a g n e s i u m . Vorkommen. Magnesium findet sich in der Natur in großen Mengen; vor allem als M a g n e s i u m c h l o r i d und M a g n e s i u m - b r o m id im Meerwasser, ferner in den Staß furter Ablage- rungen als C a r n a l l i t Mg Cl2 KCl • 6 H 2 0 und K a i n i t MgCl2 MgS04K2 SO4 · 6 H2 0 ; das Sulfat findet sich als »Bitter- salz« in vielen Mineralquellen, ferner als Mineral außer im K a i n i t im K i e s e r i t MgS04 · H 2 0 ; das Karbonat bildet mit dem Kalk zusammen den D o l o m i t und

pitfalls are to be avoided and the accuracy of potassium measurements enhanced. Magnesium; the least appreciated electrolyte Magnesium is the fourth most abundant cation (after calcium, potassium and sodium) and the second most abundant intracellular cation after potassium, but the physiological and pathological roles of magnesium are the least appreciated. Furthermore, the most common method of assessing magnesium status, namely plasma/serum measurement can be flawed and misleading ( see ref. [13] for more details). Errors in assessing magnesium status falls under two

1 Introduction The ternary systems rare earth metal ( RE )-electron-rich transition metal ( T )-magnesium exhibit a large number of RE x T y Mg z intermetallic compounds with a manifold of different structure types [ 1 ]. So far more than 200 ternary compounds have been reported [ 2 ]. Several of these compounds have simple compositions and crystallize with structure types that also occur for indides or stannides: RET 4 Mg, RET Mg, RE 4 T Mg, RET Mg 2 , and RE 2 T 2 Mg. Typical pairs of compounds [ 2 ] for these different compositions are NdNi 4 In and