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Stannide
A stannide can refer to an intermetallic compound containing tin combined with one or more other metals; an anion consisting solely of tin atoms or a compound containing such an anion, or, in the field of organometallic chemistry an ionic compound containing an organotin anion (e.g.see 〔() ().C6H6, Crystal structure of a stannide with trigonal pyramidal tin skeleton, Flacke F., Jacobs H., European journal of solid state and inorganic chemistry, 1997, 34, 5, 495-501〕 an alternative name for such a compound is stannanide.) ==Binary alkali and alkaline earth stannides== When tin is combined with an alkali or alkaline earth metal some of the compounds formed have ionic structures containing monatomic or polyatomic tin anions (Zintl ions), e.g. Sn4− in Mg2Sn 〔S.M. Kauzlarich,(1994), Zintl Compounds, Encyclopedia of Inorganic Chemistry, John Wiley & sons, ISBN 0-471-93620-0〕 Sn94−in K4Sn9.〔Tetrapotassium nonastannide, K4Sn9,C. Hoch, M. Wendorff and C. Röhr, Acta Cryst. (2002). C58, i45-i46 〕 Even with these metals not all of the compounds formed can be considered to be ionic with localised bonding, for example Sr3Sn5, a metallic compound,contains square pyramidal units.〔A3Tt5 Phases Sr3Sn5, Ba3Pb5, and La3Sn5. Structure and Bonding in a Series of Isotypic Metallic Compounds with Increased Electron Count and Their Comparison with the Nominal Zintl Phase La3In5, M. T. Klem, J. T. Vaughey, J G. Harp, and J D. Corbett, Inorg. Chem., 2001, 40 (27),7020–7026,〕
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