title: fac-[Fe(II)(CN)(3)(CO)(3)](-) and cis-[Fe(II)(CN)(4)(CO)(2)](2)(-): new members of the class of [Fe(II)(CN)(x)(CO)(y)] compounds.
abstract: The reaction of Fe(CO)(4)I(2) with NaCN or KCN in methanol gives M[Fe(II)(CN)(3)(CO)(3)] (M = Na, K), which can be converted to [Ph(4)E][Fe(II)(CN)(3)(CO)(3)] (E = P, As). The structure of the fac-[Fe(II)(CN)(3)(CO)(3)](-) (1) anion was established by the X-ray crystal structures of K-1 and [Ph(4)As]-1.H(2)O. Compound 1 has also been characterized by IR, Raman, and (13)C NMR. The coupling of the CO and CN stretching modes in the vibrational spectra of 1 have been analyzed. The reaction of Na-1 with NaCN gives Na(2) cis-[Fe(II)(CN)(4)(CO)(2)] (Na-2), which has been structurally characterized as [Ph(4)P][Et(4)N]-2. Compounds 1 and 2 are additional members of the series of compounds of general formula [Fe(II)(CN)((6-x))(CO)(x)](x-4). [Fe(CN)(x)(CO)(y)] compounds are of interest due to the occurrence of such coordination modes in hydrogenase enzymes.
authors.affiliation: Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Jiang
authors.forename: Stephen A
authors.initials: SA
authors.lastname: Koch
mesh_terms: D002248:Carbon Monoxide / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003486:Cyanides / Q000138:chemical synthesis* / Q000737:chemistry*; D005296:Ferrous Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D006860:Hydrogen Bonding; D008968:Molecular Conformation; D019906:Nuclear Magnetic Resonance, Biomolecular; D010084:Oxidation-Reduction; D010088:Oxidoreductases / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D013237:Stereoisomerism
chemical_list: D003486:Cyanides; D005296:Ferrous Compounds; D002248:Carbon Monoxide; D010088:Oxidoreductases