Autor: A. T. Shuvaev, T. I. Nedoseikina, Valery G. Vlasenko
Rok vydání: 2002
Předmět:
Zdroj: Russian Journal of Coordination Chemistry. 28:638-642
ISSN: 1070-3284
DOI: 10.1023/a:1020091000145
Popis: X-ray emission and EXAFS spectroscopies were used to examine changes in the nearest environment of manganese atoms upon radiolysis of [EtC5H4Mn(CO)2NO]+(PF6)– at different energy exposures (Φ). It was found that the initial complex loses the CO and NO ligands at Φ = 4.5 × 106 J/m2. An increase in Φ to ≥7.5 × 106 J/m2 gives rise to Mn–Mn bonds with lengths characteristic of Mn dimers. At Φ = 9.0 × 106 J/m2, Mn nanoparticles are formed; they interact with the carbon atoms of EtC5H4 and the fluorine atoms of PF6 anions. Further increase in Φ = 2.6 × 107 J/m2 yields manganese-containing nanoparticles structured like metallic Mn; their surface atoms interact with carbon atoms formed in the disintegration of the EtC5H4 ligands. The formation of manganese carbides and fluorides at Φ = 2.6 × 108 J/m2 reduces the content of the metal constituent in nanoparticles; this content is zero at Φ = 4.4 × 108 J/m2. The final radiolysis products are manganese carbides and fluorides (or fluorocarbides).
Databáze: OpenAIRE
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