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Pentaiodide komplexer Alkalimetall‐Kronenether‐Kationen: Darstellung und strukturelle Charakterisierung der Verbindungen [M(Benzo‐15‐Krone‐5) 2 ]I 5 mit M = Na, K, Rb, Cs
Author(s) -
Pantenburg Ingo,
Müller Ingrid,
Tebbe KarlFriedrich
Publication year - 2005
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200400410
Subject(s) - chemistry , alkali metal , crown ether , monoclinic crystal system , crystallography , ionic radius , molecule , dichloromethane , formula unit , triiodide , caesium , iodine , ionic bonding , metal , crystal structure , stereochemistry , inorganic chemistry , ion , solvent , electrolyte , organic chemistry , electrode , dye sensitized solar cell
Pentaiodides of Complex Alkaline Metal Crown Ether Cations: Synthesis and Structural Characterisation of the Compounds [M(benzo‐15‐crown‐5) 2 ]I 5 , M = Na, K, Rb and Cs The isotypic compounds [M(benzo‐15‐crown‐5) 2 ]I 5 , M = Na, K, Rb and Cs are obtained as single crystals via the reaction of benzo‐15‐crown‐5, MI and iodine (2 : 1 : 2) from ethanol/dichloromethane (1 : 1). These compounds crystallize in the monoclinic space group P2 1 /n with four formula units in the unit cell. The cations form typical sandwich complexes. The volume of the unit cell increases by 4, 3 % from the sodium to the caesium compound, corresponding to the increasing space required by the cations. The pentaiodide units consist of a elongated triiodide unit and two iodine half‐molecules. These iodine molecules are completed by centres of symmetry. The interconnection between the pentaiodide units leads to the formation of zig‐zag chains that run along [001]. Considering the strongly different ionic radii of the alkali‐metal cations, the existence of this number of isotypic structures is rather surprising.