• Sunder N Dhuri

      Articles written in Journal of Chemical Sciences

    • A novel hydrogen-bonded cyclic dibromide in an organic diammonium salt

      Bikshandarkoil R Srinivasan Sunder N Dhuri Jyoti V Sawant Christian Näther Wolfgang Bensch

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      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$$P\bar 1$$ with the following unit cell dimensions for C20H34Br2N2O2 (M = 494.31):a = 8.6672(6) Å,b = 11.7046(8) Å,c = 11.7731(8) Å, α = 76.988(8)°, β = 88.978(8)°, γ= 76.198(8)γ,V= 1129.26(13) Å3, 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.

    • Synthesis, properties and supramolecular structure of piperazinediium thiosulfate monohydrate

      Bikshandarkoil R Srinivasan Ashish R Naik Sunder N Dhuri Christian Näther Wolfgang Bensch

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      Aqueous reaction of ammonium thiosulfate with piperazine (pip) results in the formation of the title compound (pipH2)[S2O3]$\cdot$H2O 1 (pipH2 = piperazinediium) in good yield. 1 was characterized by elemental analysis, IR, Raman andNMRspectra, X-ray powder pattern and its structure was determined. On heating at 100°C, 1 transforms to anhydrous piperazinediium thiosulfate 2, which can be rehydrated to the monohydrate on exposure tomoisture. The structure of 1 consists of two crystallographically independent piperazinediium (pipH2)2+ cations located on inversion centers, a thiosulfate anion and a lattice water. The organic cations, thiosulfate anion and lattice water are linked by six varieties of hydrogen bond namely O-H$\cdots$O, O-H$\cdots$S, N-H$\cdots$O, N-H$\cdots$S, C-H$\cdots$O and C-H$\cdots$S, leading to the formation of alternating layers of (pipH2)2+ cations and water linked thiosulfate chains. A comparative study of several compounds charge balanced by the piperazinediium cation is described.

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