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Alkaline-earth dicyanoargentates M[Ag(CN) 2 ] 2  • 2H 2 O (M = Ca. Sr) were synthesized by reaction of M(ClO 4 ) 2  with K[Ag(CN) 2 ] and subsequent fractionated crystallization. The colourless, light-sensitive crystals are orthorhombic, space group Pbcm, with a = 8.435(1) Å, b - 6.3985(6) Å , c = 18.584(2) Å , Z = 4 (M = Ca), and a = 8.0032(8) Å, b = 6.8688(5) Å, c = 18.870(1) Å , Z = 4 (M = Sr). A structural model derived from Direct Methods was refined to R = 0.064 and R = 0.044. rsp. The structure of the two isotypic compounds comprises layers of [Ag(CN) 2 ]“ dumb-bells, arranged in such a way, that trigonal prisms of nitrogen are formed. These prisms are occupied by the alkaline-earth ions. Three oxygen atoms from neighbouring water molecules complete a tricapped trigonal prism around Ca 2+  and Sr 2+

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Darstellung und Kristallstruktur von Erdalkalidicyanoargentaten M[Ag(CN) 2 ] 2  • 2 H 2 O (M = Ca, Sr) / Properties and Crystal Structure of Alkaline-Earth Dicyanoargentates M[Ag(CN) 2 ] 2  • 2 H 2 O (M = Ca, Sr)