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Title: Synthesis, spectroscopic and X-ray structure characterization of ethylenediammonium chromate and ethylenediammonium dichromate
Authors: Srinivasan, B R
Dhuri, Sunder N
Nather, Christian
Bensch, Wolfgang
Issue Date: Nov-2003
Publisher: NISCAIR-CSIR, India
Abstract: The reaction of ethylenediammonium chloride (enH2)Cl2 with potassium chromate or dichromate in a 1:1 mole ratio results in the formation of the title complexes ethylenediammonium chromate (enH2)[CrO4] 1 and ethylenediammonium dichromate (enH2) [Cr2O7] 2 in good yields. The two complexes have been characterized by IR, UV-Vis, 1H NMR spectroscopy and metal analysis and their structures have been determined by single crystal X-ray crystallography.Ethylenediammonium chromate 1 crystallizes in the orthorhombic space group P212121 (IT-Nr. :19) with the unit cell dimensions a = 6.656(1)Å, b = 8.869(1) Å, c = 11.831 (2)Å, V = 698.4(2) Å3, Z = 4. The structure o f 1 consists of tetrahedral tetraoxochromate dianions, with the Cr at the center of the tetrahedron. Ethy lenediammonium dichromate 2 crystallizes in the monoclinic space group C2/c (IT-Nr. :15) with the unit cell dimensions a = 13.464(2) Å, b = 7.791(1)Å, c = 8.639(1)Å, β= 108.97(1), V = 857.0(2) Å3, Z = 4. In both the compounds, short H-bonding contacts are observed between the oxygen atoms bound to the Cr containing dianion and the H attached to the N atom of the organic dication.
Page(s): 2735-2741
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.42A(11) [November 2003]

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