Reaction of acetonitrile with the silicon(001) surface: A combined XPS and FTIR study

The Addition of Nitriles to Tetramesityldisilene: A Comparison of the Reactivity between Surface and Molecular Disilenes

“…Although the majority of the characterization data obtained for 13 cannot be compared to the data obtained for 1 , the FTIR spectroscopic data of 13 can be directly compared to the MIR‐FTIR spectroscopic data of 1 . The wavenumber of the absorption assigned to the CN stretching vibration of 13 (2235 cm −1 ) is quite similar to that assigned to the CN stretching vibration in 1 (2228 cm −1 ) 3. 7 Given the limitations of the techniques available to characterize surface adducts, the exact structure of surface adduct 2 could not be established 2–7.…”

“…Of the three types of adducts formed on the Si surface, only the a-CH insertion adduct (1) has been identified unambiguously. [2][3][4][5][6][7] However, all of the structures of molecular adducts were established unambiguously using spectroscopic techniques. Although the majority of the characterization data obtained for 13 cannot be compared to the data obtained for 1, the FTIR spectroscopic data of 13 can be directly compared to the MIR-FTIR spectroscopic data of 1.…”

“…The wavenumber of the absorption assigned to the CN stretching vibration of 13 (2235 cm À1 ) is quite similar to that assigned to the CN stretching vibration in 1 (2228 cm À1 ). [3,7] Given the limitations of the techniques available to characterize surface adducts, the exact structure of surface adduct 2 could not be established. [2][3][4][5][6][7] Two structures for 2 have been proposed: an 1,2,3azadisiletine, formed by the reaction between the CN bond of acetonitrile and the Si=Si bond of the dimer (2 a), and a cycloadduct containing a CH 2 CH=N moiety within a five-membered ring (2 b) ( Figure 1).…”

“…The addition of acetonitrile to the Si(100)‐2×1 surface was first reported by Xu in 2001 2. Since the initial study, the addition of acetonitrile to the Si(100)‐2×1 surface has been examined at various temperatures, including room temperature, and the adducts have been identified using a variety of techniques, including temperature‐programmed desorption (TPD),2 high‐resolution electron energy loss spectroscopy (HREELS),2 conventional X‐ray photoelectron spectroscopy (XPS),2, 3 synchrotron radiation XPS,4, 5 near‐edge X‐ray absorption fine structures (NEXAFS),4, 5 resonant Auger electron spectroscopy (RAES),6 and multiple internal reflection Fourier transform infrared (MIR‐FTIR) spectroscopy 3. Current theoretical2, 5, 7–10 and experimental3, 5, 6 evidence supports the formation of three types of nitrile adducts in equal amounts on the Si surface at room temperature: an α‐CH insertion adduct ( 1 ), a cycloadduct involving the CN bond ( 2 a , b ), and a twisted ketenimine product ( 3 a , b ) (Figure 1).…”

Chemical manipulation of multifunctional hydrocarbons on silicon surfaces

“…64. The mechanism of radical chain reaction of alkenes with a Hterminated Si(111) surface, as suggested by Chidsey(Figure based on Figure 7from Ref [29]…”