Direct evidence of adsorption induced Cr~(II) mobility on the SiO_2 surface upon complexation by CO

Diego Gianolio; Elena Groppo; Jenny G. Vitillo; Alessandro Damin; Silvia Bordiga; Adriano Zecchina; Carlo Lamberti

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Direct evidence of adsorption induced Cr~(II) mobility on the SiO_2 surface upon complexation by CO

机译：CO络合后在SiO_2表面吸附引起Cr〜（II）迁移的直接证据

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In situ, temperature dependent, XAFS proved that Cr~(II) grafted on SiO_2 is extracted from the surface upon CO adsorption at 100 K: ΔR_(Cr-O) = + 0.08 A. CO adsorption evolves into two coverage dependent steps: (i) displacement of weak siloxane ligands (non-classical carbonyls); (ii) relaxation of R_(Cr-O) surface bond, R_(Cr-CO) optimization and transformation into classical carbonyls.

机译：XAFS随温度而定，原位证明了在100 K下CO吸附时，从表面提取了接枝在SiO_2上的Cr〜（II）：ΔR_（Cr-O）= + 0.08 A.CO吸附演变成两个与覆盖率有关的步骤：（ i）取代弱硅氧烷配体（非经典羰基）；（ii）松弛R_（Cr-O）表面键，优化R_（Cr-CO）并转化为经典的羰基。

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《Chemical Communications》 |2010年第6期|976-978|共3页
作者
Diego Gianolio; Elena Groppo; Jenny G. Vitillo; Alessandro Damin; Silvia Bordiga; Adriano Zecchina; Carlo Lamberti;
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Department of Inorganic, Physical and Materials Chemistry, INSTM Centro di Riferimento and NIS Centre of Excellence, Universitd di Torino, Via P. Giuria 7, 10125 Torino, Italy;

Department of Inorganic, Physical and Materials Chemistry, INSTM Centro di Riferimento and NIS Centre of Excellence, Universitd di Torino, Via P. Giuria 7, 10125 Torino, Italy;

Department of Inorganic, Physical and Materials Chemistry, INSTM Centro di Riferimento and NIS Centre of Excellence, Universitd di Torino, Via P. Giuria 7, 10125 Torino, Italy;

Department of Inorganic, Physical and Materials Chemistry, INSTM Centro di Riferimento and NIS Centre of Excellence, Universitd di Torino, Via P. Giuria 7, 10125 Torino, Italy;

Department of Inorganic, Physical and Materials Chemistry, INSTM Centro di Riferimento and NIS Centre of Excellence, Universitd di Torino, Via P. Giuria 7, 10125 Torino, Italy;

Department of Inorganic, Physical and Materials Chemistry, INSTM Centro di Riferimento and NIS Centre of Excellence, Universitd di Torino, Via P. Giuria 7, 10125 Torino, Italy;

Department of Inorganic, Physical and Materials Chemistry, INSTM Centro di Riferimento and NIS Centre of Excellence, Universitd di Torino, Via P. Giuria 7, 10125 Torino, Italy;

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Direct evidence of adsorption induced Cr~(II) mobility on the SiO_2 surface upon complexation by CO

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