A [4+2]-like cycloaddition of methyl methacrylate on Si(100)-2 x 1.
The attachment of methyl methacrylate (MMA) on Si(100)-2x1 was investigated using high-resolution electron energy loss spectroscopy (HREELS), X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), and density functional theory (DFT) calculations. The HREELS spectra of chemisorbed MMA show the disappearance of characteristic vibrations of C=O (1725 cm(-1)) and C(sp(2))-H (3110, 1400, and 962 cm(-1)) coupled with the blue shift of the C=C stretching mode by 34 cm(-1) compared to those of physisorbed molecules. These results clearly demonstrate that both C=C and C=O in MMA directly participate in the interaction with the surface to form a SiCH(2)C(CH(3))=C(OCH(3))OSi species via a [4+2]-like cycloaddition. This binding configuration was further supported by XPS, UPS, and DFT studies.
Huang
Jing Yan
JY
Department of Chemistry, National University of Singapore.
Huang
Hai Gou
HG
Ning
Yue Sheng
YS
Liu
Qi Ping
QP
Alshahateet
Solhe F
SF
Sun
Yue Ming
YM
Xu
Guo Qin
GQ