ja6b12119_si_004.cif (2.95 MB)

Triphosphasumanene Trisulfide: High Out-of-Plane Anisotropy and Janus-Type π‑Surfaces

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posted on 07.04.2017, 00:00 by Shunsuke Furukawa, Yuki Suda, Junji Kobayashi, Takayuki Kawashima, Tomofumi Tada, Shintaro Fujii, Manabu Kiguchi, Masaichi Saito
A triphosphasumanene trisulfide was designed and synthesized as an out-of-plane anisotropic π-conjugated molecule. Incorporating three anisotropic phosphine sulfide moieties into a sumanene skeleton induced a cumulative anisotropy with a large dipole moment (12.0 D), which is aligned in perpendicular direction with respect to the π-framework and more than twice as large as those of conventional out-of-plane anisotropic molecules. In the crystal, the molecules align to form columnar structures, in which electron-rich and electron-deficient sides of the π-framework face each other. The interactions between the electron-rich surfaces, which contain three sulfur atoms, and Au(111) were examined by X-ray photoelectron spectroscopy.