- A solid-gas route to polymorph conversion in crystalline [Fe II(η5-C5H4COOH)2]. A diffraction and solid-state NMR study
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Crystalline form I (monoclinic) and form II (triclinic) of ferrocene dicarboxylic acid [Fe(η5-C5H4-COOH) 2] have been employed in solid-gas reactions at room temperature with the gaseous bases NH3, NH2(CH3), and NH(CH3)2. The two crystal forms behave in exactly the same way in the solid-gas reaction, generating the same products, identified as the anhydrous crystalline salts [NH4]2-[Fe(η5- C5H4-COO)2] (1), [NH3CH 3]2[Fe(η5-C5H 4COO)2] (2), and [NH2(CH3) 2]2[Fe(η5-C5H 4COO)2] (3). Interestingly though, all these crystals revert via vapor release exclusively to the metastable crystalline form I. Starting materials and products have been investigated by single-crystal and powder diffraction and by 13C, 15N CPMAS and 1H MAS methods.
- Braga, Dario,Grepioni, Fabrizia,Polito, Marco,Chierotti, Michele R.,Ellena, Silvano,Gobetto, Roberto
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p. 4627 - 4633
(2008/10/09)
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