A [4+2]-like cycloaddition of methyl methacrylate on Si(100)-2 x 1

作者：Huang, JY; Huang, HG; Ning, YS; Liu, QP; Alshahateet, SF; Sun, YM; Xu, GQ^*

来源：Langmuir, 2005, 21(25): 11722-11728.

DOI：10.1021/la051559l

• SI(001) SURFACE
• BONDING CONFIGURATIONS
• SEMICONDUCTOR SURFACES
• ADSORPTION
• ACETYLENE
• BINDING
• ETHYLENE
• 1,3-CYCLOHEXADIENE
• CHEMISTRY
• MECHANISM

The attachment of methyl methacrylate (MMA) on Si(100)-2 x 1 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 SiCH2C(CH3)=C(OCH3)OSi species via a [4+2]-like cycloaddition. This binding configuration was further supported by XPS, UPS, and DFT studies.

• 出版日期2005-12-6
• 单位东南大学