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题名: Heat capacity of the spin crossover complex [Fe(2-pic)(3)]Cl-2 center dot MeOH: A spin crossover phenomenon with weak cooperativity in the solid state
作者: Nakamoto, T;  Tan, ZC;  Sorai, M
刊名: INORGANIC CHEMISTRY
发表日期: 2001-07-16
DOI: 10.1021/ic010073z
卷: 40, 期:15, 页:3805-3809
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Inorganic & Nuclear
研究领域[WOS]: Chemistry
英文摘要: Heat capacities of the spin crossover complex [Fe(2-pic)(3)]Cl . MeOH (2-pic: 2-picolylamine or 2-aminomethylpyridine) were measured with an adiabatic calorimeter between 12 and 355 K. A broad heat capacity peak, starting from similar to 80 K, culminating at similar to 150 K, and terminating at similar to 250 K, was observed. The temperature range of the heat capacity anomaly corresponds to that where the: low-spin and high-spin states coexist in the Fe-57 Mossbauer spectra. The enthalpy and entropy changes arising from the heat capacity anomaly were 8.88kJ mol(-1) and 59.5 J K-1 mol(-l), respectively. The entropy gain was much larger than the contribution expected from the change in the spin-manifold R In 5;(13.4 J K-1 mol(-l)) where R is the gas constant. The-remaining entropy gain is attributed to the contribution from the change in the internal vibrations. On the basis of the domain model, the number of molecules per domain was found to be very close to unity, implying a very weak cooperativity in the spin crossover occurring in the solid state of this complex.
关键词[WOS]: PHASE-TRANSITION MECHANISM ;  ELASTIC INTERACTION ;  CRYSTALS ;  <FE(2-PIC)3>CL2.ETOH ;  INTERCONVERSION ;  TRANSFORMATION ;  MOLECULES ;  DYNAMICS ;  IRON(II) ;  LATTICE
语种: 英语
WOS记录号: WOS:000169861800020
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139029
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Osaka Univ, Grad Sch Sci, Res Ctr Mol Thermodynam, Toyonaka, Osaka 5600043, Japan
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Nakamoto, T,Tan, ZC,Sorai, M. Heat capacity of the spin crossover complex [Fe(2-pic)(3)]Cl-2 center dot MeOH: A spin crossover phenomenon with weak cooperativity in the solid state[J]. INORGANIC CHEMISTRY,2001,40(15):3805-3809.
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