title: Synthesis, reactivity, structures, and dynamic properties of gyroscope like iron complexes with dibridgehead diphosphine cages: pre- vs. post-metathesis substitutions as routes to adducts with neutral dipolar Fe(CO)(NO)(X) rotors.
abstract: Three routes are explored to the title halide/cyanide complexes trans-Fe(CO)(NO)(X)(P((CH2)14)3P) (9c-X; X = Cl/Br/I/CN), the Fe(CO)(NO)(X) moieties of which can rotate within the diphosphine cages (ΔH‡/ΔS‡(kcal mol-1/eu-1) 5.9/-20.4 and 7.4/-23.9 for 9c-Cl and 9c-I from variable temperature13C NMR spectra). First, reactions of the known cationic complex trans-[Fe(CO)2(NO)(P((CH2)14)3P)]+BF4-and Bu4N+X-give 9c-Cl/-Br/-I/-CN (75-83%). Second, reactions of the acyclic complexes trans-Fe(CO)(NO)(X)(P((CH2)mCH[double bond, length as m-dash]CH2)3)2and Grubbs' catalyst afford the tris(cycloalkenes) trans-Fe(CO)(NO)(X)(P((CH2)mCH[double bond, length as m-dash]CH(CH2)m)3P) (m/X = 6/Cl,Br,I,CN, 7/Cl,Br, 8/Cl,Br) as mixtures of Z/E isomers (24-41%). Third, similar reactions of trans-[Fe(CO)2(NO)(P((CH2)mCH[double bond, length as m-dash]CH2)3)2]+BF4-and Grubbs' catalyst afford crude trans-[Fe(CO)2(NO)P((CH2)mCH[double bond, length as m-dash]CH(CH2)m)3P)]+BF4-(m = 6, 8). However, the C[double bond, length as m-dash]C hydrogenations required to consummate routes 2 and 3 are problematic. Crystal structures of 9c-Cl/-Br/-CN are determined. Although the CO/NO/X ligands are disordered, the void space within the diphosphine cages is analyzed in terms of horizontal and vertical constraints upon Fe(CO)(NO)(X) rotation and the NMR data. The molecules pack in identical motifs with parallel P-Fe-P axes, and without intermolecular impediments to rotation in the solid state.
authors.affiliation: Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA. gladysz@mail.chem.tamu.edu.
authors.forename: Georgette M
authors.initials: GM
authors.lastname: Lang
authors.affiliation: Institut für Organische Chemie and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 42, 91054 Erlangen, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Skaper
authors.affiliation: Institut für Organische Chemie and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Henkestraße 42, 91054 Erlangen, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Hampel
authors.affiliation: Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas 77842-3012, USA. gladysz@mail.chem.tamu.edu.
authors.forename: John A
authors.identifier: http://orcid.org/0000-0002-7012-4872
authors.initials: JA
authors.lastname: Gladysz