Reversible Spin-State Switching Involving a Structural Change

REVERSIBLE SPIN-STATE SWITCHING INVOLVING A STRUCTURAL CHANGE 

Natural Science Center for Basic Research and Development Hiroshima University, Higashi-Hiroshima, Japan 

Self-assembled coordination poiymers containing transition metal ions and organic bridging ligands have attracted intensive interest because of their potentiai abiiities for selective inclusion and transformation of ions and molecules [I-4]. Construction of a variety of assembled structures plays an important role in designing the size and shape of vacancy. Both the variety of assembled structures and sorption of guest molecules can affect the properties of assembled complexes. 

Spin-crossover phenomenon is one of the hot topics in the assembled complexes [5-20]. In the study of spin-crossover complexes, intermolecular interaction (cooperativity) is important. High-spin and low-spin states can coexist at the same temperature (bistability), depending on the cooperativity. The bistability will be stabilized by the cooperativity. In this situation, two states of bistability are interconverted by outer stimuli, bringing a function of molecular switch to the sample. In order to achieve the bistability, assembly of complexes becomes important. In this context, it is important to investigate the assembled complexes, especially from the viewpoint of spin-crossover phenomenon, that is, whether the presence of a guest molecule has a great influence on the construction of assembled structures and the spin state of the metal ions [21,22]. 

Mossbauer Spectroscopy Applications in Chemistry, Biology, and Nanotechnology, First Edition. Edited by Virender K. Sharma, Gostar Kiingeihofer, and Tetsuaid Nishida. 

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REVERSIBLE SPIN-STATE SWITCHING INVOLVING A STRUCTURAL CHANGE OF Fe (NCX)2(bpp)2 2(BENZENE) (X = Se, BH3) TRIGGERED BY SORPTION OF BENZENE MOLECULES [30]... 

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