New complexes of tris(2-aminoethanolato-O,N)cobalt(III) sulfates: Synthesis and structure |
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| Authors: | A S Kotovaya S G Shova Yu A Simonov A P Gulya |
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| Institution: | (1) Moldova State University, ul. Matteevicha 60, Chisinau, 277009, Moldova;(2) Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, Moldova |
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| Abstract: | The reaction of Co(Etm)3] · 3H2O (I) with sulfuric acid affords Co(HEtm)3]2(SO4)3 · 4H2O (II). The change in the synthesis procedure (the direction interaction of cobalt(II) sulfate with β-aminoethanol (HEtm)) makes it possible to isolate Co(HEtm)3](SO4)(HSO4) · H2O (III) and {Co(HEtm)3]Co(Etm)3]}2(SO4)3 · 7.75H2O (IV). The X-ray diffraction analyses of compounds II–IV show that all of them are of the ionic type. In compounds II and III, the ionic structure consists of the Co(HEtm)3]3+ cations and sulfate anions in a ratio of 2: 3 and 1: 2, respectively. The basic difference in compounds II and III is the different degrees of deprotonation of the acid residues. In complex II, two anions SO 4 2? are doubly deprotonated. In complex III, of the four anions found in the independent part of the unit cell of the sulfate anion two anions are monodeprotonated. In structure IV, two crystallographically independent complexes Co(HEtm)3]3+ and Co(Etm)3] are joined into a dimer through the O-H?O hydrogen bonding. |
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