ISSN:
1600-5759
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The title compound, poly[[diaquadibromocadmium-μ-(1,3,5,7-tetraazatricyclo[3.3.1.13,7]decane-N1:N5)-aquacadmium-di-μ-bromo-aquacadmium-μ-(1,3,5,7-tetraazatricyclo[3.3.1.13,7]decane-N1:N5)-di-μ-bromo] dihydrate], [Cd3Br6(C6H12N4)2(H2O)4]·2H2O, is made up of two-dimensional neutral rectangular coordination layers. Each rectangular subunit is enclosed by a pair of Cd3(μ2-Br)6(H2O)3 fragments and a pair of (μ2-hmt)Cd(H2O)2Br2(μ2-hmt) fragments as sides (hmt is hexamethylenetetramine). The unique CdII atom in the Cd2Br2 ring in the Cd3(μ2-Br)6(H2O)3 fragment is in a slightly distorted octahedral CdNOBr4 geometry, surrounded by one hmt ligand [2.433 (5) Å], one aqua ligand [2.273 (4) Å] and four Br atoms [2.6409 (11)–3.0270 (14) Å]. The CdII atom in the (μ2-hmt)Cd(H2O)2Br2(μ2-hmt) fragment lies on an inversion center and is in a highly distorted octahedral CdN2O2Br2 geometry, surrounded by two trans-related N atoms of two hmt ligands [2.479 (5) Å], two trans-related aqua ligands [2.294 (4) Å] and two trans-related Br atoms [2.6755 (12) Å]. Adjacent two-dimensional coordination sheets are connected into a three-dimensional network by hydrogen bonds involving lattice water molecules, and the aqua, bromo and hmt ligands belonging to different layers.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108270100007435
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