Structural and 57Fe-Mössbauer characterization of mononuclear ferrous and ferric pyrazole complexes
摘要:
The reactions of FeX3 (X = Cl and Br) and pz*H (pz*H = pyrazole, or substituted pyrazole) in CH2Cl2 have led to three types of mononuclear complexes: mer-[FeX3(pz*H)(3)], trans-[FeX2(pz*H)(4)](-) and trans-[FeX2(pz*H)(4)]. The latter type, containing Fe-II-centers results from spontaneous reduction of the Fe-III starting material. The X-ray crystal structures of eleven such complexes and the Fe-57-Mossbauer spectra of three of them are reported. (C) 2012 Elsevier Ltd. All rights reserved.