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- Title
Structure and Bonding of High-Spin Nitrosyl-Iron(II) Compounds with Mixed N,O-Chelators and Aqua Ligands.
- Authors
Wolf, Markus; Klüfers, Peter
- Abstract
High-spin nitrosyl-iron centres of the Enemark-Feltham {FeNO}7 type exist in aqueous solution. Examples include the tentative "brown-ring" species [Fe(H2O)5(NO)]2+ and a tentative FeII/edta/NO species formed in the processes for scrubbing NO from flue-gas streams. Inert-gas bubbling through the solutions subdivides the ferrous nitrosyl complexes in a less stable subclass - a prominent member being the brown-ring complex - and a more stable subclass to which the edta species belongs. The structural chemistry of the less stable subclass of {FeNO}7- type complexes from aqueous media is presented here. They contain aminecarboxylato co-ligands of limited denticity and aqua ligands that complete an OC-6 environment of the Fe atom. Crystalline compounds for single-crystal structure analysis were obtained for various co-ligands: [Fe(H2O)2(ida)(NO)] (2a), [Fe(H2O)(heida)(NO)] (2b), [Fe(H2O)2(NO)(oda)] (2c), [Fe(H2O)2(NO)(phida)]·H2O (2d), [Fe(bnida)(H2O)2(NO)] (2e), [Fe(brbnida)(H2O)2(NO)] (2f) and [Fe(dipic)(H2O)2(NO)] (2g) (ida = iminodiacetate, heida = hydroxyethyliminodiacetate, oda = oxodiacetate, phida = N-phenyliminodiacetate, bnida = N-benzyliminodiacetate, brbnida = N-4-bromobenzyliminodiacetate, dipic = dipicolinate). The Fe-NO interaction was studied by DFT and CASSCF methods. Due to mostly covalent Fe-NO p bonds, the charge distribution in the less stable subclass is close to FeII(NO) with a small FeIII(NO-) contribution.
- Subjects
NITROSYL compounds; IRON compounds; IRON chelates; HIGH spin physics; LIGANDS (Chemistry); AQUEOUS solutions; CHEMICAL bonds; SINGLE crystals
- Publication
European Journal of Inorganic Chemistry, 2017, Vol 2017, Issue 17, p2303
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201601329