1. Ionic-Liquid-Based Synthesis of the Germanium-Iron Carbonyls FeI4{GeI3Fe(CO)3}2 and (GeI3)2Fe(CO)4.
- Author
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Wolf, Silke and Feldmann, Claus
- Subjects
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IONIC liquids , *CARBONYL compounds , *CHEMICAL synthesis , *GERMANIUM , *INTERMOLECULAR interactions , *THERMOGRAVIMETRY - Abstract
Dark red and brick red transparent crystals of FeI4{GeI3Fe(CO)3}2 ( 1) and (GeI3)2Fe(CO)4 ( 2) were obtained by reacting GeI4 and Fe2(CO)9 or Fe3(CO)12 in a mixture of [BMIM]Cl and AlCl3 as ionic liquid (BMIm = 1-butyl-3-methylimidazolium). According to X-ray structure analysis based on single crystals, the title compounds exhibit cluster units with Fe-Ge bonds. FeI4{GeI3Fe(CO)3}2 consists of two GeI2I1/2-Fe(CO)3I2/2 units that are interlinked by a distorted octahedral FeI6/2 group. (GeI3)2Fe(CO)4 consists of two GeI3 units that are connected by a square planar Fe(CO)4 group with a linear Ge-Fe-Ge unit. Depending on the synthesis conditions, interestingly, (GeI3)2Fe(CO)4 crystallizes either in P21/ n ( 2a) or in P 1 ( 2b). 2a exhibits a more dense packing, whereas 2b exhibits shorter intermolecular I-I distances. Both title compounds are temperature labile and highly sensitive to oxygen, moisture and illumination, including X-ray irradiation. They decompose with release of CO in absence of certain CO atmosphere. In addition to crystal structure analysis the compounds were characterized by energy dispersive X-ray (EDX) analysis, thermogravimetry (TG) and infrared spectroscopy (FT-IR). [ABSTRACT FROM AUTHOR]
- Published
- 2017
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