In:
Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 69, No. 11-12 ( 2014-12-1), p. 1141-1148
Abstract:
We report on the synthesis and crystal structure of the octaammine calcium(II) halides [Ca(NH 3 ) 8 ]Br 2 , and [Ca(NH 3 ) 8 ]I 2 , which were synthesized by the reaction of the respective calcium( II) halides with dry liquid ammonia. The compounds form colorless crystals which crystallize isotypically at 123 K with Z = 4 in the orthorhombic space group Pnma with a = 12:0478(3), b = 7:4406(2), c = 15:7216(4) Å, V = 1409:33(6) Å 3 for the bromide, and a = 12:1113(4), b = 7:7706(3), c = 16:7145(6) Å, V = 1573:0(1) Å 3 for the iodide. Instead of the expected tetragonal antiprism for the eightfold-coordinated Ca 2+ ions, we observed a coordination polyhedron best described as a twofold capped trigonal prism. After evaporation of the liquid ammonia and warming of [Ca(NH 3 ) 8 ]I 2 to room temperature, [Cu(NH 3 ) 6 ]I 2 was obtained as a colorless powder. The hexaammine calcium(II) iodide crystallizes isotypically to [Mn(NH 3 ) 6 ]I 2 (CaF 2 type) in the cubic space group Fm3̅m with a = 11:18580(6) Å, V = 1399:59(1) Å 3 , Z = 4 at 293 K
Type of Medium:
Online Resource
ISSN:
1865-7117
,
0932-0776
DOI:
10.5560/znb.2014-4134
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2014
detail.hit.zdb_id:
2078109-X
detail.hit.zdb_id:
124635-5
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