title: Iron(II) complexes of new hexadentate 1,1,1-tris-(iminomethyl)ethane podands, and their 7-methyl-1,3,5-triazaadamantane rearrangement products.
abstract: New iron(II) podand complexes have been prepared, by condensation of 2-(aminomethyl)-2-methyl-1,3-diaminopropane with 3 equiv of a heterocyclic aldehyde in the presence of hydrated Fe[BF(4)](2) or Fe[ClO(4)](2) as templates. The 2-(aminomethyl)-2-methyl-1,3-diaminopropane is prepared in situ by deprotonation of its trihydrochloride salt. The chloride must be removed from these reactions by precipitation with silver, to avoid the formation of the alternative 2,4,6-trisubstituted-7-methyl-1,3,5-triazaadamantane condensation products, or their FeCl(2) adducts. The crystal structures of two 2,4,6-tri(pyridyl)-7-methyl-1,3,5-triazaadamantane-containing species are presented, and contain two different geometric isomers of this tricyclic ring with three equatorial, or two equatorial and one axial, pyridyl substituents. Both structures feature strong C-HX (X = Cl or F) hydrogen bonding from the aminal C-H groups in the triazaadamantane ring. Five iron(II) podand complexes were successfully obtained, all of which contain low-spin iron centres.
authors.affiliation: School of Chemistry, University of Leeds, UK.
authors.forename: Sara A
authors.initials: SA
authors.lastname: Diener
authors.forename: Amedeo
authors.initials: A
authors.lastname: Santoro
authors.forename: Colin A
authors.initials: CA
authors.lastname: Kilner
authors.forename: Jonathan J
authors.initials: JJ
authors.lastname: Loughrey
authors.forename: Malcolm A
authors.initials: MA
authors.lastname: Halcrow
mesh_terms: D000218:Adamantane / Q000031:analogs & derivatives* / Q000737:chemistry*; D004980:Ethane / Q000031:analogs & derivatives* / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*
chemical_list: C574070:7-methyl-1,3,5-triazaadamantane; D009942:Organometallic Compounds; D007501:Iron; D004980:Ethane; D000218:Adamantane