Iron(II) complexes of imidazoline-2-thiones: the crystal structure of dichlorobis(1-methylimidazoline-2-thione)iron(II) |
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| Authors: | Eric S. Raper Peter Carty James R. Creighton Angela Miller William Clegg |
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| Affiliation: | (1) Department of Chemical and Life Sciences, The Polytechnic, NEi 8ST Newcastle upon Tyne, UK;(2) Department of Inorganic Chemistry, The University, NEi 7RU Newcastle upon Tyne, UK |
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| Abstract: | Summary Imidazoline-2-thione (imtH2) and 1-methylimidazoline-2-thione (mimtH) react with FeCl2·4H2O in rigorously anhydrous media producing complexes of general formula Fe(LH)2Cl2.Infrared and electronic spectra as well as room temperature magnetic moments are consistent with mononuelear, pseudotetrahedral species. The crystal structure of [Fe(mimHH)2Cl2] confirms this arrangement. The complex crystallises in a triclinic unit cell (a=7.376(2),b=7.595(2),c=15.043(4) Å.  =76.80(1)°,  =79.60(1)°,  =61.90(1)°; V=721.13 Å3; space group=P1, Z=2). Final conventional R from 2267 observed data (F >4 (F)) is 0.0271. Average bond lengths are 2.353 Å (Fe–S) and 2.265 Å (Fe–Cl). Angles at the metal range from 91.5(1)° to 114.5(1)°.Thermal degradation of the complexes in flowing air involves sequential loss of halogen and ligand with -Fe2O3 as the final product. The decomposition is exothermic in flowing dinitrogen. |
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