Spin Crossover in a Vacuum-Deposited Submonolayer of a Molecular Iron(II) Complex
Spin Crossover in a Vacuum-Deposited Submonolayer of a Molecular Iron(II) Complex
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DOI：
10.1021/jz3011805
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发表时间：
2012-12-06
影响因子：
5.7
通讯作者：
Kuch, Wolfgang
中科院分区：
文献类型：
--
作者：
Bernien, Matthias;Wiedemann, Dennis;Kuch, Wolfgang
过渡金属络合物(自旋交叉)的自旋态转换对各种微小的微扰很敏感。通常发现，对于直接吸附在固体表面的分子，它会被抑制。本文报道了在超高真空条件下，[Fe-II(Ncs)(2)L](L：1-{6-[1，1-di(pyridin-2-yl)ethyl]pyridin-2-yl}-N，，N-二甲基甲胺)沉积在高取向热解石墨衬底上的X射线吸收光谱测量。这些分子经历了热诱导的、完全可逆的、渐进的自旋交叉，其转变温度为T-1/2=235(6)K，转变宽度为T-80=115(8)K。我们的结果表明，通过使用碳基衬底，即使是与固体表面直接接触的分子，也可以保持自旋交叉行为。
Spin-state switching of transition-metal complexes (spin crossover) is sensitive to a variety of tiny perturbations. It is often found to be suppressed for molecules directly adsorbed on solid surfaces. We present X-ray absorption spectroscopy measurements of a submonolayer of [Fe-II(NCS)(2)L] (L: 1-{6-[1,1-di(pyridin-2-yl)ethyl]pyridin-2-yl}-N,N-dimethylmethanamine) deposited on a highly oriented pyrolytic graphite substrate in ultrahigh vacuum. These molecules undergo a thermally induced, fully reversible, gradual spin crossover with a transition temperature of T-1/2 = 235(6) K and a transition width of Delta T-80 = 115(8) K. Our results show that by using a carbon-based substrate the spin-crossover behavior can be preserved even for molecules that are in direct contact with a solid surface.