Ba. Omotowa et al., Preparation and characterization of nonpolar fluorinated carbosilane dendrimers by APcI mass spectrometry and small-angle X-ray scattering, J AM CHEM S, 121(48), 1999, pp. 11130-11138
The following highly fluorinated nonpolar dendrimers were obtained in high
yields from multiple hydrosilylation reactions between core hydride termina
ted carbosilane dendrimers and ally1-1,1-dihydrofluoroethyl ether or ally1-
1,1-dihydroheptadecafluorononyl ether through divergent synthetic routes: S
i[CH2CH2SiMe2(CH2CH2CH2OCH2CF3)](4) (7),Si{CH2CH2SiMe[CH2CH2SiMe(CH2CH2CH2O
CH2CF3)(2)](2)}(4) (8), Si[CH2CH2Si(CH2CH2CH2OCH2C8F17)(3)]4 (9), Si[CH2CH2
SiMe2(CH2CH2CH2OCH2C8F17)](4) (10), and Si{CH2CH2Si[CH2CH2Si(CH2CH2CH2OCH2C
8F17)(3)](3)}(4) (11) These compounds were characterized by elemental and s
pectroscopic analyses. Valuable mass spectral data were obtained by using a
tmospheric pressure chemical ionization (APcI). The fluorinated dendrimer m
olecule and the nonfluorinated core scatter X-ray light differently and pre
sent unique slopes on the Guinier Plot of data from small-angle X-ray light
scattering (SAXS) in hexafluorobenzene. Glass transition temperatures (T-g
) and thermogravimetric analyses (TGA) of the dendrimers were determined.