Sünkel K, Blockhaus T. Coordination chemistry of polynitriles. Part 9. Decacyanoferrocene revisited. Crystal and molecular structure of cis-[{C5(CN)5}2(MeCN)4Fe].
ACTA CRYSTALLOGRAPHICA SECTION C STRUCTURAL CHEMISTRY 2022;
78:94-100. [PMID:
35119387 PMCID:
PMC8815677 DOI:
10.1107/s2053229622000365]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 01/11/2022] [Indexed: 11/15/2022]
Abstract
The crystal structure determination of the enigmatic ‘decacyanoferrocene’ identifies this compound as cis-[{C5(CN)5}2(MeCN)4Fe].
The reaction of Ag[C5(CN)5] with anhydrous FeCl2 in acetonitrile leads to colourless crystals of tetrakis(acetonitrile-κN)bis(pentacyanocyclopentadienido-κN)iron(II) acetonitrile 1.8-solvate, [Fe(C10N5)2(CH3CN)4]·1.8CH3CN or cis-[{C5(CN)5}2(MeCN)4Fe]·1.8MeCN. The compound crystallizes in the triclinic space group P as monomers, which exhibit weak C—H⋯N and π–π interactions. The crystals contain ca 20% solvent-accessible voids, which are nearly completely filled by two MeCN molecules.
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