Polymorphism and “reverse” spin transition in the spin crossover system [Co(4-terpyridone)2](CF3SO3)2·1H2O
Polymorphism and “reverse” spin transition in the spin crossover system [Co(4-terpyridone)2](CF3SO3)2·1H2O
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自旋交叉体系中的多晶型和“反向”自旋跃迁[Co(4-三联吡啶酮)2](CF3SO3)2·1H2O
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Real
中科院分区：
文献类型：
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作者：
G. Agustí;Carlos Bartual;V. Martínez;Francisco J. Muñoz;A. Gaspar;M. Muñoz;J. Real
化合物[Co（4-terpyridone）2]（CF 3SO 3）2·1H 2 O，其中4-terpyridone为2，6-bis（2-pyridyl）-4（1H）-pyridone，形成两种多晶型。多晶型物1在300-120 K的温度范围内显示出连续的自旋转换，而多晶型物2在冷却时显示出连续的高自旋（HS）到低自旋（LS）转换的开始，在217-203 K的温度范围内被突然的“反向”自旋转变中断。所形成的不稳定的HS中间相（IP）经历了强合作的“正常”的自旋转变，其特征在于由33 K宽的磁滞回线。的结构数据提供支持的晶体相变，这是伴随着发生的“反向”自旋态转变。
Compound [Co(4-terpyridone)2](CF3SO3)2·1H2O, where 4-terpyridone is 2,6-bis(2-pyridyl)-4(1H)-pyridone, forms two polymorphs. Polymorph 1 displays a continuous spin conversion in the temperature region 300–120 K while polymorph 2 shows, on cooling, the onset of a continuous high-spin (HS) to low-spin (LS) conversion interrupted by an abrupt “reverse” spin transition in the temperature region 217–203 K. The formed unstable HS intermediate phase (IP) undergoes a strong cooperative “normal” spin transition characterised by a hysteresis loop 33 K wide. The structural data give support for a crystallographic phase transition, which takes place concomitantly with the “reverse” spin state transition.