Startseite Synthesis, Structural and Spectroscopic Characterization of the α,ω-Diammonioalkane Hexabromorhodates( III) [H3N(CH2)xNH3]2[H5O2][RhBr6]Br2 (x = 3, 4) – IR Spectra of [H5O2]+ Ions with Weak Solid State Interactions
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Synthesis, Structural and Spectroscopic Characterization of the α,ω-Diammonioalkane Hexabromorhodates( III) [H3N(CH2)xNH3]2[H5O2][RhBr6]Br2 (x = 3, 4) – IR Spectra of [H5O2]+ Ions with Weak Solid State Interactions

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Veröffentlicht/Copyright: 2. Juni 2014
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The reaction of rhodium(III) chloride trihydrate with 1,3-diaminopropane and 1,4-diaminobutane in concentrated hydrobromic acid results in the formation of the bis(α,ω-diammonioalkane) diaquahydrogen(1+) hexabromorhodate(III) dibromides [H3N(CH2)xNH3]2[H5O2][RhBr6]Br2 (x = 3, 4). Dark red single crystals were obtained by diffusion-controlled crystallization at room temperature. Both compounds crystallize in space group type P1̄ and their structures are closely related. In view of crystal engineering they are inorganic-organic hybrid materials built up from octahedral [RhBr6]3−, simple Br and flexible chain-like [H3N(CH2)xNH3]2+ ions with the [H5O2]+ and further Br ions incorporated and thus might be considered as addition compounds [H3N(CH2)xNH3]2[RhBr6]Br ∙ [H5O2]Br. Cationic and anionic moieties in the crystal are held together by a complex system of N-H∙∙∙Br and O-H∙∙∙Br hydrogen bonds. Geometric features of O-H∙∙∙Br hydrogen bonding as well as the pronounced disorder of the [H5O2]+ ions in the diammoniopropane salt indicate the weak association of these species in the solids. Weak association of the ions is also documented by difference ATR-FT-IR spectra of the compounds and related diammonioalkane dibromides that show the stretching modes of the terminal O-H bonds above 3300 cm−1. Further characteristic bands are recognized at ca. 1635 (s), 985 (vs), and 670 (m) cm−1.

Received: 2002-10-9
Published Online: 2014-6-2
Published in Print: 2002-12-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

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