A novel hydrogen-bonded cyclic dibromide in an organic diammonium salt |
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Authors: | Bikshandarkoil R. Srinivasan Sunder N. Dhuri Jyoti V. Sawant Christian N?ther Wolfgang Bensch |
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Affiliation: | (1) Department of Chemistry, Goa University PO, 403 206 Goa;(2) Institut für Anorganische Chemie, Christian-Albrechts-Universit?t Kiel, Olshausenstra?e 40, D-24098 Kiel, Germany |
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Abstract: | The organic diammonium salt N,N′-dibenzyl-N,N,N′,N′-tetramethylethylenediammonium dibromide dihydrate, (dbtmen)Br2.2H2O (1), was prepared by the reaction of N,N,N′,N′-tetramethyl-ethylenediamine (tmen) with benzyl bromide.1 crystallizes in the triclinic space group with the following unit cell dimensions for C20H34Br2N2O2 (M = 494.31):a = 8.6672(6) ?,b = 11.7046(8) ?,c = 11.7731(8) ?, α = 76.988(8)°, β = 88.978(8)°, γ= 76.198(8)γ,V= 1129.26(13) ?3, Z=2. Three components, namely the (dbtmen)2+ dication, two bromide anions and two crystal water molecules constitute the structural arrangement of1. H2O molecules are linked to bromide anions via O-H...Br hydrogen bonding interactions resulting in the formation of a four-membered O2Br2 cyclic dibromide. The O2Br2 units and the dications are arranged as alternating layers extending in the crystallographicbc plane. The arrangement of anions and cations may be viewed as a typical lamellar structure. The crystal water molecules can be removed by heating 1 at 140°C and the anhydrous dibromide thus formed can be fully rehydrated as evidenced by IR spectra and X-ray powder patterns. Dedicated to Prof S Chandrasekaran on the occasion of his 60th birthday |
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Keywords: | N,N′ -dibenzyl-N,N,N′ ,N′ -tetramethylethylenediammonium dibromide hydrogen bonding interactions cyclic dibromide |
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