title: In-house and synchrotron X-ray diffraction studies of 2-phenyl-1,10-phenanthroline, protonated salts, complexes with gold(III) and copper(II), and an orthometallation product with palladium(II).
abstract: Different salts of the 2-phenyl-1,10-phenanthrolin-1-ium cation, (pnpH)(+), are obtained by reacting 2-phenyl-1,10-phenanthroline (pnp), C18H12N2, (I), with a variety of anions, such as hexafluoridophosphate, C18H13N2(+)·PF6(-), (II), trifluoromethanesulfonate, C18H13N2(+)·CF3SO3(-), (III), tetrachloridoaurate, (C18H13N2)[AuCl4], (IV), and bromide (as the dihydrate), C18H13N2(+)·Br(-)·2H2O, (V). Compound (I) crystallizes with Z' = 2, with both independent molecules adopting a coplanar conformation. In (II)-(IV), a hydrogen bond exists between the cation and anion, while one of the lattice water molecules serves as a hydrogen-bonded bridge between the cation and anion in (V). Reaction of (I) with HAuCl4 gives the salt complex (IV); however, reaction with KAuCl4 produces the monodentate complex trichlorido(2-phenyl-1,10-phenanthroline-κN(10))gold(III), [AuCl3(C18H12N2)], (VI). Dichlorido(2-phenyl-1,10-phenanthroline-κ(2)N,N')copper(II), [CuCl2(C18H12N2)], (VII), results from the reaction of CuCl2·2H2O and (I), in which the Cu(II) center adopts a tetrahedrally distorted square-planar geometry. The pendent phenyl ring twists to a bisecting position relative to the phenanthroline plane. The square-planar Pd(II) complex, bromido[2-(phenanthrolin-2-yl)phenyl-κ(3)C(1),N,N']palladium(II), [PdBr(C18H11N2)], (VIII), is obtained from the reaction of (I) with [PdCl2(cycloocta-1,5-diene)], followed by addition of bromine. A coplanar geometry for the pendent ring is adopted as a result of the tridentate bonding motif.
authors.affiliation: Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA.
authors.forename: Jeanette A
authors.initials: JA
authors.lastname: Krause
authors.affiliation: Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA.
authors.forename: Daoli
authors.initials: D
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA.
authors.forename: Sayandev
authors.initials: S
authors.lastname: Chatterjee
authors.affiliation: Department of Chemistry, College of Wooster, Wooster, OH 44691, USA.
authors.forename: Roland
authors.initials: R
authors.lastname: Falcon
authors.affiliation: Department of Chemistry, College of Wooster, Wooster, OH 44691, USA.
authors.forename: Kristen
authors.initials: K
authors.lastname: Stoltz
authors.affiliation: Department of Chemistry, College of Wooster, Wooster, OH 44691, USA.
authors.forename: John C
authors.initials: JC
authors.lastname: Warren
authors.affiliation: Department of Chemistry, College of Wooster, Wooster, OH 44691, USA.
authors.forename: Sara E
authors.initials: SE
authors.lastname: Wiswell
authors.affiliation: Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA.
authors.forename: William B
authors.initials: WB
authors.lastname: Connick
authors.affiliation: Department of Chemistry, College of Wooster, Wooster, OH 44691, USA.
authors.forename: Sibrina N
authors.initials: SN
authors.lastname: Collins
keywords: 2-phenyl-1,10-phenanthroline; crystal structure; hydrogen bonding; multidentate coordination; ortho-palladation; protonated salts; synchrotron diffraction