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Nakashima, Satoru*; Kaneko, Masashi; Yoshinami, Keisuke*; Iwai, Saki*; Dote, Haruka*
Hyperfine Interactions, 239(1), p.39_1 - 39_15, 2018/12
Times Cited Count：2 Percentile：66.27(Physics, Atomic, Molecular & Chemical)The present study reveals the on/off of spin-crossover (SCO) phenomenon in assembled Fe(II) complexes bridged by bis(pyridyl) type ligand. Whether SCO phenomenon occurs or not in assembled Fe(II) complexes bridged by bis(pyridyl) type ligand is determined by local structure around iron atom. SCO phenomenon occurs when the coordinating pyridines facing to each other across the iron atom are propeller type, while the phenomenon does not occur when they are parallel type or distorted propeller type. DFT calculation explained that, in the shortening of Fe-pyridine bonds when changing from high-spin state to low-spin state, the pyridines of propeller type can approach the iron atom with smaller steric hindrance than those of parallel and distorted propeller type complexes. The local structure is controlled by introducing methyl substituent and introducing 
-system, changing SCO phenomenon. And the transition temperature of SCO is also controlled in assembled complexes bridged by 1,2-bis(4-pyridyl)ethane by mixing anionic ligand.
Nakashima, Satoru*; Kaneko, Masashi
Advances in Chemistry Research, Vol.36, p.171 - 195, 2017/01
Spin-crossover (SCO) phenomena of the assembled coordination polymers are introduced. When the bridging ligand is flexible like 1,2-bis(4-pyridyl)ethane, 1,3-bis(4-pyridyl)propane, a variety of assembled structure can be obtained, depending on the conformer of the ligand and the guest molecules. Guest-dependent SCO phenomena of the assembled iron complexes are shown. Density functional theory is applied to know the cause of guest-dependent SCO phenomena. The validity of an iron mono-nucleus model is evaluated for the coordination polymers. It is shown that SCO occurs or not depends on the local structure around iron ion.
Fujita, Ayumi
Physical Review B, 62(22), p.15190 - 15194, 2000/12
Times Cited Count：4 Percentile：27.84(Materials Science, Multidisciplinary)no abstracts in English
Yamazawa, Hiromi; Amano, Hikaru
Genshiryoku Kogyo, 42(8), p.49 - 53, 1996/00
no abstracts in English
Harami, Taikan
Genshiryoku Kogyo, 42(11), p.77 - 79, 1996/00
no abstracts in English
