Journal
INORGANICA CHIMICA ACTA
Volume 359, Issue 6, Pages 1955-1960Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2005.11.039
Keywords
iron complexes; PNP ligand; PNN ligand; paramagnetic; magnetic properties; X-ray crystal structures
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Reaction of the PNN ligand ((2-(di-tert-butylphosphinomethyl)-6-diethylaminomethyl)pyridine) with I equiv. of anhydrous FeCl2 in THF results in the formation of (PNN)FeCl2 (1). The cationic complex [(PNN)Fe(THF)Cl](PF6) (2) was obtained by chloride abstraction from I with I equiv. of TlPF6. Similarly, the PNP-type complexes 3 and 4 were obtained from FeCl2 with I equiv. of t-Bu-PNP (2,6-bis(di-tert-butylphosphinomethyl)pyridine) and i-Pr-PNP (2,6-bis(di-iso-propylphosphinomethyl)pyridine), respectively. Complexes 1 and 3 were characterized by X-ray diffraction and elemental analyses. In both structures the Fe(II) centers exhibit a distorted square pyramidal geometry comprising two chloride ligands and one tridentate PNN or PNP ligand. The magnetic properties of the paramagnetic complexes 1-4 are discussed. (c) 2005 Elsevier B.V. All rights reserved.
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