CuxM1–x(HCOO)2·2H2O, (M=Mn, Co, Ni, Cd): Crystal Structures and Thermal Behavior

✍ Scribed by A.G. Leyva; G. Polla; D. Vega; R. Baggio; P.K. de Perazzo; M.A.R. de Benyacar; M.T. Garland

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 159 KB
• Volume: 157
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.9021

✦ Synopsis

A crystallographic and thermal study of the system Cu x M 1؊x (HCOO) 2 ' 2H 2 O (M:Mn, x‫;74.0؍‬ Co, x‫;53.0؍‬ Ni, x‫;73.0؍‬ Cd, x‫)74.0؍‬ has been performed. The compounds, grown at room temperature, crystallize in space group P2 1 /c and are isostructural with Cu 0.5 Zn 0.5 (HCOO) 2' 2H 2 O (1), with the cations sharing the two special position sites M1 and M2. In all cases, the best re5nement was achieved with the copper atoms occupying preferentially the hexaformate-coordinated site M1, while the M 2؉ cations were mainly localized in the M2 sites, in a mixed coordination environment. The compounds present a variety of thermal behaviors, with dehydration taking place at di4erent temperatures and decomposition going from a simple single step process, as in the Zn compound, up to a complex three-stage one as in the Mn and Cd compounds. Decomposition products were identi5ed by X-ray di4raction on quenched samples at the end of each thermal stage. Some discrepancies of the present results with those in the literature are discussed.

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