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2005
Structure
D 2000
03- 009
Crystal and Species Engineering with Semi-Flexible Nitrogen Containing Organic
Cations: Generation of [H13O6]+ Ions with the Unfavored Unbranched Topology
by Enclosing Hydrochloric Acid in a Porous Inorganic-Organic Hybrid Material.
? Single crystals of [H2dach]3[H13O6][RhCl6]2Cl (I) (dach: 1,4-diazacycloheptane) are
obtained by diffusion-controlled crystallization from conc. HCl solutions containing
RhCl3�2O and dach. Slow evaporation of the mother liquor over a period of several
days yields a few tiny crystals of [H2dach]2[RhCl6]Cl�75H2O (II). Compounds (I) and
(II) are inorganic-organic hybrid materials built up from octahedral [RhCl6]3-, Cl-, and
1,4-diazoniumcycloheptane ions, incorporating either the [H13O6]+ and further Cl- ions
or portions of simple water molecules. Both compounds crystallize in the monoclinic
space group P21/c with Z = 2 (I) and Z = 4 (II), respectively. Compound (I) contains
isolated [H13O6]+ ions with a linear chain-like configuration enclosed in the cavities of
the inorganic-organic framework. The presence of a strong central O贩稨贩稯 hydrogen
bond within the [H13O6]+ ions is confirmed by the short O贩稯 separation of 2.47 � and
by characteristic IR absorption bands. ? (GRAF, J.; FRANK*, W.; Z. Anorg. Allg.
Chem. 630 (2004) 12, 1894-1902; Inst. Anorg. Chem. Strukturchem.,
Heinrich-Heine-Univ., D-40225 Duesseldorf, Germany; Eng.) ? Schramke
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