Organogermanium polymers: Pyrolysis chemistry of poly[(germylene)diacetylenes]

A study on pyrolysis and cross-link formation of poly(p-phenylene butadiyne) by thermoanalysis and spectroscopy

“…The C-H vibrations of the terminal acetylene groups were observed at 3265 cm À1 (n -CBC-H ), 637 cm À1 , and 1263 cm À1 (d -CBC-H ) [9], which agreed with the result of 13 C NMR mentioned above. The peak at 1915 cm À1 was assigned to the diacetylene band that was affected by the conjugation with the phenyl groups [10], because it was located at an intermediate wavenumber between isolated acetylene (2209 cm À1 ) [5] and diacetylene (2070 cm À1 ) [11], and allene (1887 cm À1 ) [12] and butatriene (1880 cm À1 ) [13]. The peaks at 544 and 833 cm À1 were the out-of-plane deformation vibrations of the aromatic C-H pertaining to the two adjacent hydrogen atoms attached to the phenyl ring of PPPB [8,9].…”

“…The FT-IR spectra were obtained by the diffuse reflectance method using an FT-IR spectrometer (Magna560, Nicolet). 13 C NMR spectra were obtained using the CPMAS technique (spinning rate = 6 kHz) using an NMR spectrometer (AVANCE DSX300, Bruker). External adamantane was used as a chemical shift reference (d = 2.95 ppm for the high field resonance).…”

Organometallic Polymers of Germanium, Tin and Lead

“…The pyrolysis of poly[(germylene)diacetylenes] 35 under argon was studied 112 . At relatively low temperatures (150-250°C) cross polymerization through the triple bonds was observed and further heating to temperatures up to 1200°C provided crystalline germanium clusters, together with a large amount of free carbon (40-61%).…”

Micropattern of GeO 2 /GeC lines prepared by UV irradiation and heat treatment of polygermane copolymers of methylphenylgermylene/phenylgermyne units

“…18 Previously, we have reported on the formation of micropatterns of GeC/GeO 2 by photocrosslinking branched oligo(phenylgermyne) film under UV irradiation and subsequent heat treatment in vacuo. 19 On the other hand, micrography of poly(methylphenylgermylene) was unclear because its molecular weight decreased to 50% and a ceramic film could not be obtained after UV irradiation and heat treatment.…”