title: σ-π Continuum in Indole-Palladium(II) Complexes.
abstract: The intrinsic features of (hetero-arene)-metal interactions have been elusive mainly because the systematic structure analysis of non-anchored hetero-arene-metal complexes has been hampered by their labile nature. We report successful isolation and systematic structure analysis of a series of non-anchored indole-palladium(II) complexes. It was revealed that there is a σ-π continuum for the indole-metal interaction, while it has been thought that the dominant coordination mode of indole to a metal center is the Wheland-intermediate-type σ-mode in light of the seemingly strong electron-donating ability of indole. Several factors which affect the σ- or π-character of indole-metal interactions are discussed.
authors.affiliation: Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Myodaiji, Okazaki, Aichi, 444-8787, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Yamamoto
authors.affiliation: Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Myodaiji, Okazaki, Aichi, 444-8787, Japan.|Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan.
authors.forename: Seita
authors.initials: S
authors.lastname: Kimura
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8552, Japan. mura@apc.titech.ac.jp.
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Murahashi
keywords: indoles; palladium; π-complexes; σ-complexes; σ-π continuum