Study on the spin crossover transition and glass transition for Fe(II) complex film, [Fe(II)(H-triazole)3]@Nafion, by means of Mossbauer specrtoscopy
Study on the spin crossover transition and glass transition for Fe(II) complex film, [Fe(II)(H-triazole)3]@Nafion, by means of Mossbauer specrtoscopy
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穆斯堡尔谱研究Fe(II)络合物薄膜[Fe(II)(H-三唑)3]@Nafion的自旋交叉转变和玻璃化转变
DOI：
10.1007/s10751-011-0477-3
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发表时间：
2012
影响因子：
--
通讯作者：
Akio Nakamoto
中科院分区：
文献类型：
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作者：
Y. Mizuno;M. Okubo;K. Kagesawa;D. Asakura;T. Kudo;H.S. Zhou;K. Oh-ishi;A. Okazawa;N. Kojima;Hiromichi Ida;Zhangzhen He;Takayuki Ishida;Kei Fujiwara;Yuki Ono;Akio Nakamoto
[Fe（II）（H-trz）3]@Nafion（trz = triazole）是一种透明的自旋交叉复合膜，在225 ~ 300 K之间发生低自旋（S = 0）和高自旋（S = 2）态之间的自旋交叉跃迁。在该薄膜中，在57 Fe穆斯堡尔谱中观察到对应于低自旋和高自旋态的两个双峰，反映了自旋交叉跃迁。通过对~（57）Fe穆斯堡尔谱的分析，在10 ~ 150 K的温度范围内，低自旋和高自旋位的德拜温度分别为185 K和176 K。在这种薄膜中，对应于低自旋和高自旋位置的穆斯堡尔谱的总强度在200 K以上急剧下降，反映了Nafion的玻璃化转变，其中[Fe（H-trz）3]的晶格振动由于Nafion聚合物膜部分的微布朗运动而软化，就像在溶液中一样。
[Fe(II)(H-trz)3]@Nafion (trz = triazole) is a transparent spin crossover complex film, where the spin crossover transition between the low-spin (S = 0) and the high-spin (S = 2) states takes place between 225 K and 300 K. In this film, two doublets corresponding to the low-spin and high-spin states were observed in the57Fe Mössbauer spectra, reflecting the spin crossover transition. From the analysis of57Fe Mössbauer spectra, the Debye temperatures of the low-spin and high-spin sites were estimated at 185 K and 176 K, respectively, in the temperature range between 10 K and 150 K. In this film, the total intensity of the Mössbauer spectra corresponding to the low-spin and high-spin sites drastically decreases above 200 K, reflecting the glass transition of Nafion, where the lattice vibration of [Fe(H-trz)3]is softened just as in solution due to micro-Brown motion of the segment of Nafion polymer membrane.