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| Title: | A {Fe(NO)3}10 Trinitrosyliron Complex Stabilized by an N-Heterocyclic Carbene and the Cationic and Neutral {Fe(NO)2}9/10 Products of Its NO Release |
| Authors: | Hsieh, Chung-Hung;Darensbourg Marcetta Y. |
| Contributors: | 淡江大學化學學系 |
| Date: | 2010-10 |
| Issue Date: | 2014-03-27 09:06:36 (UTC+8) |
| Publisher: | Washington, DC: American Chemical Society |
| Abstract: | In contrast to the instability of XFe(NO)3 and [R3PFe(NO)3]+, the N-heterocyclic carbene (NHC)-containing trinitrosyliron complex (TNIC) [(IMes)Fe(NO)3][BF4] (1) [IMes =1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene] can be readily isolated and manipulated in solution under ambient conditions. Nevertheless, in the presence of thiolates (SR−), this EPR-silent TNIC (denoted {Fe(NO)3}10 in the Enemark−Feltham notation) releases gaseous NO, affording in the case of SR− = SPh− the EPR-active, neutral dinitrosyliron complex (DNIC) (IMes)Fe(SPh)(NO)2 (3, {Fe(NO)2}9). Carbon monoxide enforces a bimolecular reductive elimination of PhSSPh from 3, yielding (IMes)(CO)Fe(NO)2 (2), a reduced {Fe(NO)2}10 DNIC. The NO released from TNIC 1 in the presence of SPh− could be taken up by the NO-trapping agent [(bme-dach)Fe]2 [bme-dach = N,N′-bis(2-mercaptoethyl)-1,4-diazacycloheptane] to form the mononitrosyliron complex (MNIC) (bme-dach)Fe(NO). In the absence of SPh−, direct mixing of [(bme-dach)Fe]2 with 1 releases both NO and the NHC with formation of a spin-coupled, diamagnetic {Fe(NO)}7−{Fe(NO)2}9 complex, [(NO)Fe(bme-dach)Fe(NO)2][BF4] (4). In 4, the MNIC serves as a bidentate metallodithiolate ligand of Fe(NO)2, forming a butterfly complex in which the Fe−Fe distance is 2.7857(8) Å. Thus, 1 is found to be a reliable synthon for [{Fe(NO)2}9]+. The solid-state molecular structures of complexes 1−3 show that all three complexes have a tetrahedral geometry in which the bulky mesitylene substituents of the carbene ligand appear to umbrella the Fe(NO)2L [L = NO (1), CO (2), SPh (3)] motif. |
| Relation: | Journal of the American Chemical Society 132(40), pp.14118-14125 |
| DOI: | 10.1021/ja104135x |
| Appears in Collections: | [化學學系暨研究所] 期刊論文
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