Synthesis,crystal structures and spectroscopic studies of praseodymium(III) malonate complexes |
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| Authors: | Konstantina E Chrysomallidou Spyros P Perlepes Aris Terzis Catherine P Raptopoulou |
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| Institution: | 1. Department of Chemistry, University of Patras, 265 04 Patras, Greece;2. Institute of Materials Science, NCSR “Demokritos”, 153 10 Aghia Paraskevi Attikis, Greece |
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| Abstract: | Reactions of malonic acid (H2mal) with PrCl3·6H2O afforded the known complex Pr2(mal)3(H2O)6]n (1), and compounds Pr2(mal)3(H2O)6]n·2nH2O (2·2nH2O), PrCl(mal)(H2O)3]n·0.5nH2O (3·0.5nH2O) and Pr(mal)(Hmal)(H2O)3]n·nH2O (4·nH2O) using various reaction ratios, reaction media (H2O, MeOH) and pH values. Analogous reactions with CeCl3·7H2O afforded compounds Ce2(mal)3(H2O)6]n (5), CeCl(mal)(H2O)3]n·nH2O (6·nH2O) and Ce(mal)(Hmal)(H2O)3]n·nH2O (7·nH2O). Compounds 2·2nH2O and 3·0.5nH2O were characterized by X-ray crystallography, and 4–7 by microanalytical and spectroscopic data. The malonate(-2) ligand adopts three different coordination modes in the structures of 1–3, i.e., the μ2-κO:κO′:κO″ and the μ4-κ2O:κO′:κ2O″:κO? in 1 and 2 leading to a 3D network structure, and the μ3-κ2O:κO′:κ2O″:κO? in 3 promoting an 1D structure. The thermal decomposition of 1 and 3·0.5nH2O was monitored by TG/DTA and TG/DTG measurements. The structural features of 1–3 are discussed in terms of known malonato(-2) LnIII and CaII complexes. The bioinorganic chemistry relevance of our results is discussed. |
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| Keywords: | Crystal structures Malonate complexes Praseodymium(III) complexes Spectroscopic probes |
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