Iron(II) and 1,1,1-Tris(2-pyridyl)nonadecane Complex Showing an Order-Disorder-Type Structural Transition and Spin-Crossover Synchronized over Both Conformers

摘要

The title compound (Me4N)[Fe{(2-py)(3)C-n-C18H37}(NCS)(3)] having a C-18 chain underwent spin-crossover (SCO). There are two crystallographically independent molecules in a triclinic cell at 100 K but only one in a monoclinic cell at 300 K. The complex showed a gradual one-step SCO in the same temperature region as that of the structural transition. The SCO is supported with the Fe-57 Mossbauer spectroscopy. The molecules are differentiated on cooling, but the SCO was synchronized.