Re-Appearance of Cooperativity in Ultra-Small Spin-Crossover [Fe(pz){Ni(CN)4}] Nanoparticles

被引：69
作者：
Peng, Haonan [1 ,2 ,3 ]
Tricard, Simon [1 ,2 ,3 ]
Felix, Gautier [1 ,2 ,3 ]
Molnar, Gabor [1 ,2 ,3 ]
Nicolazzi, William [1 ,2 ,3 ]
Salmon, Lionel [1 ,2 ,3 ]
Bousseksou, Azzedine [1 ,2 ,3 ]
机构：
[1] CNRS, UPR 8241, Lab Chim Coordinat, F-31077 Toulouse, France
[2] Univ Toulouse, F-31077 Toulouse, France
[3] UPS, INP, F-31077 Toulouse, France
来源：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2014年 / 53卷 / 41期
关键词：
Debye temperature; Mossbauer spectroscopy; nanoparticles; spin crossover; transition metals;
D O I：
10.1002/anie.201406710
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A reverse nanoemulsion technique was used for the elaboration of [Fe(pz){Ni(CN)(4)}] nanoparticles. Low-temperature micellar exchange made it possible to elaborate ultrasmall nanoparticles with sizes down to 2 nm. When decreasing the size of the particles from 110 to 12 nm the spin transition shifts to lower temperatures, becomes gradual, and the hysteresis shrinks. On the other hand, a re-opening of the hysteresis was observed for smaller (2 nm) particles. A detailed Fe-57 Mossbauer spectroscopy analysis was used to correlate this unusual phenomenon to the modification of the stiffness of the nanoparticles thanks to the determination of their Debye temperature.
引用
收藏
页码：10894 / 10898
页数：5
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