(E)-3-(2-Chloro-3,3,3-trifluoro­prop-1-en­yl)-2,2-dimethyl-N,N-diphenyl­cyclo­propane­carboxamide

The title compound, C21H19ClF3NO, was synthesized from 3-[(E)-2-chloro-3,3,3-trifluoro­prop-1-en­yl]-2,2-dimethyl­cyclo­propane­carboxylic acid and diphenyl­amine. The propenyl and carboxamide substituents lie on the same side of the cyclo­propane ring plane, with the two methyl substituents on either side of the plane. The phenyl rings of the carboxamide are inclined at an angle of 84.6 (3)° to one another. The F atoms are disordered over two positions; the site occupancy factors are ca 0.6 and 0.4

(E)-3-(2-Chloro-3,3,3-trifluoro­prop-1-en­yl)-2,2-dimethyl-N-(2-naphth­yl)cyclo­propane­carboxamide

The title compound, C19H17ClF3NO, was synthesized from 3-[(E)-2-chloro-3,3,3-trifluoro­prop-1-en­yl]-2,2-dimethyl­cyclopropane­carboxylic acid and 2-aminona­phthalene. There are two molecules in the asymmetric unit. The dihedral angle between the naphthalene and cyclo­propane units is 111.6 (5)°. Molecules are connected into chains by intermol­ecular N—H⋯O hydrogen bonds. One of the Cl atoms is disordered over two positions with occupancies 0.653 (15) and 0.347 (15)

Orbital density wave induced by electron-lattice coupling in orthorhombic iron pnictides

In this paper we explore the magnetic and orbital properties closely related to a tetragonal-orthorhombic structural phase transition in iron pnictides based on both two- and five-orbital Hubbard models. The electron-lattice coupling, which interplays with electronic interaction, is self-consistently treated. Our results reveal that the orbital polarization stabilizes the spin density wave (SDW) order in both tetragonal and orthorhombic phases. However, the ferro-orbital density wave (F-ODW) only occurs in the orthorhombic phase rather than in the tetragonal one. Magnetic moments of Fe are small in the intermediate Coulomb interaction region for the striped antiferromangnetic phase in the realistic five orbital model. The anisotropic Fermi surface in the SDW/ODW orthorhombic phase is well in agreement with the recent angle-resolved photoemission spectroscopy experiments. These results suggest a scenario that the magnetic phase transition is driven by the ODW order mainly arising from the electron-lattice coupling.Comment: 21 pages, 10 figure