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Iodotrinitrosyliron is formed by passing a stream of nitrogen monoxide over solid diiodotetracarbonyliron or in dichloromethane solution by reaction of nitrogen monoxide with the iodo bridged diiodotetranitrosyldiiron. Solid [Fe(NO) 3 I] readily loses nitrogen monoxide to give [(ON) 2 Fe(μ‐I) 2 Fe(NO) 2 ](Fe‐Fe). The structure of freshly prepared [Fe(NO) 3 I] was determined by X‐ray diffraction at 200 K and shows tetrahedral coordination with N‐Fe‐N and N‐Fe‐I angles of 110.3(2)° and 108.6(2)° and bent Fe‐N‐O groups (166.5(6)°). The monomeric [Fe(NO) 3 I] and the dimer [Fe(NO) 2 I] 2 can be clearly distinguished by the frequencies and the ratio of the intensities of the two NO absorptions and from the latter the tetrahedral ON‐Fe‐NO angle can be derived. A short overview on nitrosyl iron halides is given.
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Beck et al. (2004) studied this question.
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