Dry synthesis of triple cumulative double bonds (C=C=C=N) on Si(111)-7 x 7 surfaces

作者：Huang, HG; Xiang, CL; Ning, YS; Huang, JY; Ang, SG; Xu, GQ^*

来源：Journal of Physical Chemistry B, 2005, 109(41): 19296-19300.

DOI：10.1021/jp053158k

• SYNCHROTRON-RADIATION PHOTOEMISSION
• X 7) SURFACE
• ELECTRONIC-STRUCTURE
• SELECTIVE FORMATION
• ORGANIC-MOLECULES
• MATRIX-ISOLATION
• ADSORPTION
• ACETYLENE
• BENZENE
• BINDING

The interactions of cyanoacetylene and diacetylene with a Si(I 1 l)-7 x 7 surface have been studied as model systems to mechanistically understand the chemical binding of unsaturated organic molecules to diradical-like silicon dangling bonds. Vibrational studies show that cyanoacetylene mainly binds to the surface through a diradical reaction involving both cyano and C C groups with an adjacent adatom-rest atom pair at 110 K, resulting in an intermediate containing triple cumulative double bonds (C=C=C=N). On the other hand, diacetylene was shown to the covalently attached to Si(111)-7 x 7 only through one of its C C groups, forming an enynic-like structure with a C=C-C C skeleton. These chemisorbed species containing triple cumulative double bonds (C=C=C=N) and C=C-C C may be employed as precursors (or templates) for further construction of bilayer organic films on the semiconductor surfaces.

• 出版日期2005-10-20