A Solid−Gas Route to Polymorph Conversion in Crystalline [FeII(η5-C5H4COOH)2]. A Diffraction and Solid-State NMR Study
摘要:
Crystalline form I (monoclinic) and form II (triclinic) of ferrocene dicarboxylic acid [Fe(eta(5)-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(eta(5)-C5H4COO)(2)] (1), [NH3CH3](2)[Fe(eta(5)-C5H4COO)(2)] (2), and [NH2(CH3)(2)](2)[Fe(eta(5)-C5H4COO)(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 C-13, N-15 CPMAS and H-1 MAS methods.
A Solid−Gas Route to Polymorph Conversion in Crystalline [Fe<sup>II</sup>(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>COOH)<sub>2</sub>]. A Diffraction and Solid-State NMR Study
作者:Dario Braga、Fabrizia Grepioni、Marco Polito、Michele R. Chierotti、Silvano Ellena、Roberto Gobetto
DOI:10.1021/om060468w
日期:2006.9.1
Crystalline form I (monoclinic) and form II (triclinic) of ferrocene dicarboxylic acid [Fe(eta(5)-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(eta(5)-C5H4COO)(2)] (1), [NH3CH3](2)[Fe(eta(5)-C5H4COO)(2)] (2), and [NH2(CH3)(2)](2)[Fe(eta(5)-C5H4COO)(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 C-13, N-15 CPMAS and H-1 MAS methods.
Self-Amplified Cascade Degradation and Oxidative Stress Via Rational pH Regulation of Oxidation-Responsive Poly(ferrocene) Aggregates
作者:Chengzhou Song、Minglong Chen、Jiajia Tan、Jie Xu、Yuben Zhang、Guoying Zhang、Xianglong Hu、Shiyong Liu