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The Structures of Tl-superconducting single crystals

Butlletí de les Societats Catalanes de Física, Química, Matemàtiques i Tecnologia
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  • Chemistry


Morphology and X-ray powder diffraction of Mn-ethylenediaminetetraacetate metal complexes. I : With hexacoordinated metal ions (R = Ni, Co, Cu, Zn) MORPHOLOGY AND X-RAY POWDER DIFFRACTION OF Mn-ETHYLENE- DIAMINETETRAACETATE METAL COMPLEXES. 1. WITH HEXACOORDINATED METAL IONS (R = Ni, Co, Cu, Zn). [(H,O)4Mn(C10H1,N,O8R)]n.2n(H,O); (R = Ni, Co, Cu, Zn). MERCE FONT-BARDIA AND MANUEL FONT-AL TABA. Departament de Cristal • lografia , Mineralogia i Diposits minerals, Universitat de Barcelona , Marti i Franques , 08028 Barcelona. INTRODUCTION The affinity of ethylenediaminetetraacetic acid (H4EDTA) for Ca was described by F. Hunz. G. Schwarzenbach and his school described this compound as an excellent chelating agent for certain metals (I to 3) and applied it in chemical and clinical analysis. The compound was used in the textile industry (4) and also as a drug to solve metallic intoxications (5 to 7). The study of the molecular and crystal structure of EDTA metal complexes was carried out by the J.L. Hoard school (8 to 16) in the Chemical Department of Cornell University (U.S.) and by M.A. Porai-Koshits et al. (17 to 24) in the Chemical Department of the Moscow University «M.V. Lomonosov,, (Russia). A large number of papers on the structural analysis of EDTA metal complexes have been published, covering a wide range of elements (25 to 30); studies referring to MnEDTA with four transition elements (Co, Ni, Cu, Zn) were performed in the Departament de Cristal•lografia, Mineralogia i Diposits Mineral at the Universitat de Barcelona and published in Acta Crystallographica (25). In contrast, papers on X-ray powder diffraction of EDTA metal complexes are very few and it is only possible to obtain reduced information in this field. The aim of this paper is to attempt to provide further information and, at the same time, to describe the morphology of the crystals as far as possible. SAMPLE PREPARATION. Samples were obtained by reacting metal carbonates (MnCO3 and RCO3) wi

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