Alkalimetallen, Alkoxiden, [(C6H5),X]CI (X = P, As), bipy, Nabipy und Na,bipy untersucht. Inorganic Polyhedron Compounds, I11 ')Ziti's "Polyanionic Salts": Preparation and Properties of the Crystalline Compounds [Na, * 7enlSn9, (Na, -5enlCe,, and ~NP, * 4enjSb, and of their sdutiomThe Crystal Structure of [Na, * 7en]Sn, Alloys of sodium with germanium, tin, lead, antimony, or bismuth when treated with ethylenediamine (en) yield stable solutions of Zintrs so called "polyanionic salts", from which the crystalline compounds "a,. 7en]Sn,, "a4. SenlGe,, and "a3 . 4en]Sb7 are obtained. "a,. 7en]Sn, contains the Sn;--polyhedron (crystal structure determination) with a geometry between the ideal geometries of the tricapped trigonal prism ( 0 9 and the antiprism capped on one square (C4v). The compound is strongly diamagnetic (electron delocalisation). The coordinated en may be completely removed under mild conditions from "a,. 7en]Sn, without a collapse of the polyanionic structure of Na,Sn,. In solution polyhedra of the same composition are found. The compounds are very sensitive against oxygen and water. Apart from these reactions the behaviour of "a,. 7en]Sn9 against the alkali metals, alkoxides, [(C,H,),X]CI (X = P, As), bipy, Nabipy, and Na,bipy is investigated. Die Ergebnisse zeigen, daI3 die zusatzliche Verwendung von 2,2,2-crypt = N(C2H40C2-H40C2H4)3N, die kiirzlich von einer anderen Arbeitsgruppe beschrieben wurde 6-' ), ZUT Stabilisierung nicht notwendig ist. Kryptat bietet nur eine weitere Moglichkeit, aus den in Analogie zu unserer Methode verwendeten khylendiaminlosungen kristalline Verbindungen zu gewinnen.Nachfolgend berichten wir iiber unsere weiteren Untersuchungen auf diesem Gebiet. ErgebaisSe Darstellong der kristallimen VerbindungenIn iihnlicher Weise wie Na/Sn-Legierungen ' ) lost hhylendiamin Legierungen von Natrium und Germanium mit orangeroter Farbe, von Natrium und Blei mit brauner

Upon use of a synthetic method reported earlier by us respective alloys of Na/Sn, Na/Ge and Na/Sb are dissolved in ethylenediamine and the title compounds precipitated from the solutions in high yield. By recrystallisation well shaped, stable crystals are obtained. The crystal structure of [Na4 · 7 en]Sn9 confirms the presence of a Sn94---polyhedron which had been suggested by us on the basis of other investigations. The Sn94--polyhedron may be described as a distorted tricapped trigonal prism. Ethylenediamine is coordinated to Na+-ions exclusively.

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54) are described. The polymers were separated by gelchromatography into three fractions of different molecular weights. The polymers of 5 and 35 cannot be redissolved after lyophilization. Einleitung

Abstract5 en]Ge9 und [Na3°C 4 en]Sb7 und ihrer Lösungen.