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Opposite Surface and Bulk Solvatochromic Effects in a Molecular Spin-Crossover Compound Revealed by Ambient Pressure X-ray Absorption Spectroscopy
Langmuir ( IF 3.7 ) Pub Date : 2018-03-06 00:00:00 , DOI: 10.1021/acs.langmuir.8b00028 Francesco Borgatti 1 , Piero Torelli 2 , Marco Brucale 1 , Denis Gentili 1 , Giancarlo Panaccione 2 , Celia Castan Guerrero 2 , Bernhard Schäfer 3, 4 , Mario Ruben 3, 4 , Massimiliano Cavallini 1
Langmuir ( IF 3.7 ) Pub Date : 2018-03-06 00:00:00 , DOI: 10.1021/acs.langmuir.8b00028 Francesco Borgatti 1 , Piero Torelli 2 , Marco Brucale 1 , Denis Gentili 1 , Giancarlo Panaccione 2 , Celia Castan Guerrero 2 , Bernhard Schäfer 3, 4 , Mario Ruben 3, 4 , Massimiliano Cavallini 1
Affiliation
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We investigate the solvatochromic effect of a Fe-based spin-crossover (SCO) compound via ambient pressure soft X-ray absorption spectroscopy (AP-XAS) and atomic force microscopy (AFM). AP-XAS provides the direct evidence of the spin configuration for the Fe(II) 3d states of the SCO material upon in situ exposure to specific gas or vapor mixtures; concurrent changes in nanoscale topography and mechanical characteristics are revealed via AFM imaging and AFM-based force spectroscopy, respectively. We find that exposing the SCO material to gaseous helium promotes an effective decrease of the transition temperature of its surface layers, while the exposure to methanol vapor causes opposite surfacial and bulk solvatochromic effects. Surfacial solvatochromism is accompanied by a dramatic reduction of the surface layers stiffness. We propose a rationalization of the observed effects based on interfacial dehydration and solvation phenomena.
中文翻译：
通过环境压力X射线吸收光谱揭示的分子自旋交叉化合物的表面和本体溶剂变色作用的相反
我们通过环境压力软X射线吸收光谱（AP-XAS）和原子力显微镜（AFM）研究了基于铁的自旋交联（SCO）化合物的溶剂化变色效应。AP-XAS直接提供了SCO材料的Fe（II）3d态自旋构型的直接证据，这些原位暴露于特定的气体或蒸气混合物中。通过AFM成像和基于AFM的力谱分别揭示了纳米级形貌和机械特性的同时变化。我们发现，将SCO材料暴露于气态氦气可有效降低其表面层的转变温度，而暴露于甲醇蒸气会引起相反的表面和整体溶剂变色效应。表面溶剂变色现象伴随着表面层刚度的急剧降低。
更新日期：2018-03-06
中文翻译：
通过环境压力X射线吸收光谱揭示的分子自旋交叉化合物的表面和本体溶剂变色作用的相反
我们通过环境压力软X射线吸收光谱（AP-XAS）和原子力显微镜（AFM）研究了基于铁的自旋交联（SCO）化合物的溶剂化变色效应。AP-XAS直接提供了SCO材料的Fe（II）3d态自旋构型的直接证据，这些原位暴露于特定的气体或蒸气混合物中。通过AFM成像和基于AFM的力谱分别揭示了纳米级形貌和机械特性的同时变化。我们发现，将SCO材料暴露于气态氦气可有效降低其表面层的转变温度，而暴露于甲醇蒸气会引起相反的表面和整体溶剂变色效应。表面溶剂变色现象伴随着表面层刚度的急剧降低。
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