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Proof of the Existence of a Linear, Centrosymmetric Polyiodide Ion I 4 2− : the crystal structure of Cu(NH 3 ) 4 I 4
Author(s) -
Dubler Erich,
Linowsky Lothar
Publication year - 1975
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19750580845
Subject(s) - chemistry , crystallography , monoclinic crystal system , octahedron , intramolecular force , tetragonal crystal system , diffractometer , crystal structure , copper , ion , bond length , crystal (programming language) , stereochemistry , organic chemistry , computer science , programming language
Tetrammine‐copper(II)‐tetraiodide Cu(NH 3 ) 4 I 4 crystallizes in the monoclinic space group C 2/m. The crystal structure has been determined from X‐ray diffractometer data and refined to R w = 2.2%. Four coplanar nitrogen atoms and two axial iodine atoms form an octahedral coordination around Cu(II) with a pronounced 4 + 2 tetragonal distortion. A connection of the Cu(II) atoms by linear, centrosymmetric I 4 2−polyiodide ions results in infinite chains of [Cu(NH 3 ) 4 2+I 4 2− ]‐units. The central I‐I‐bond distance in I 4 2−is 2.802(1) Å; a considerable amount of I‐I bonding is indicated by the distance of 3.342(1) Å found for the terminal bonds. These intramolecular bond distances correspond to calculated I‐I‐bond orders of 0.80 and 0.43.