title: Synthesis and characterization of phthalocyanines with direct Si-Si linkages.
abstract: Several cofacial phthalocyanines (Pcs) with an Si-Si linkage were obtained by one-step condensation of 1H-isoindole-1,3(2H)-diimine with hexachlorodisilane as template in quinoline. They were characterized by gel-permeation chromatography, IR, NMR spectroscopy, and mass spectrometry, and cyclic voltammetry. The results strongly suggest that we indeed obtained Pc dimers directly linked by an Si-Si bond using this novel concept of utilizing a compound/salt with an element-element bond as a template. The cofacial dimer structures are reasonably supported by X-ray absorption near-edge structure (XANES), electronic absorption and magnetic circular dichroism (MCD) spectra, and molecular orbital (MO) calculations. Interestingly, they show an electronic absorption spectrum very similar to that of silicon tetrabenztriazacorrole (SiTBC).
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan. nagaok@mail.cc.tohoku.ac.jp
authors.forename: Nagao
authors.initials: N
authors.lastname: Kobayashi
authors.forename: Fumio
authors.initials: F
authors.lastname: Furuya
authors.forename: Gyeong-Chang
authors.initials: GC
authors.lastname: Yug
authors.forename: Hisanobu
authors.initials: H
authors.lastname: Wakita
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Yokomizo
authors.forename: Naoto
authors.initials: N
authors.lastname: Ishikawa