Synthesis and monolayer behavior of organogermanium clusters

Takahiro Ogawa, Jun Matsui, Ryosuke Fujii, Akira Watanabe, Tokuji Miyashita

Research output: Contribution to journalArticlepeer-review


Several organogermanium clusters (Or-GeCs) with different organic capping reagents have been synthesized, and their monolayer behaviors on a water surface studied. GeCl 4 and organic bromides were reacted in a one-pot process using magnesium to synthesize the corresponding Or-GeCs. The structures of the Or-GeCs were characterized by UV-vis, NMR, and FT-IR spectroscopy. GPC measurements were also collected, and the results revealed that the cores of the clusters were composed of a 3-D Ge-Ge network capped with organic reagents. Surface pressure (π)-area (A) isotherms and Brewster angle microscopy (BAM) measurements indicated that the Or-GeCs with alkyl capping regents formed an oil, whereas those with aromatic capping regents formed a solid-like monolayer at the air-water interface. It was concluded that the occurrence of a π-π interaction between the aromatic capping reagents was necessary for the formation of a solid-like film. Phenyl-GeCs, which contained a phenyl group capping reagent, were transferred onto a solid substrate using the Langmuir-Schaeffer method, and atomic force microscopy (AFM) images revealed a uniform film (root mean square roughness of 0.6nm) of 3-4nm in thickness. Furthermore, a multilayer phenyl-GeC film was prepared by repeating the deposition process.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Colloid And Interface Science
Issue number1
Publication statusPublished - 2013 Feb 1


  • Assembly
  • Inorganic polymer
  • σ-Conjugated polymer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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