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Surface Stabilized Porphyrin and Phthalocyanine Two-Dimensional Network Connected by Hydrogen Bonds

2001; American Chemical Society; Volume: 105; Issue: 44 Linguagem: Inglês

10.1021/jp0105701

1520-6106

Shengbin Lei, C. Wang, S. X. Yin, H. N. Wang, Fengna Xi, H. W. Liu, Bin Xu, L. Wan, Chunli Bai,

Spectroscopy and Quantum Chemical Studies

Using carboxyl functionalized porphyrin and phthalocyanine as building blocks and alkane derivatives as coadsorbates, two-dimensional hydrogen-bonded networks were formed on graphite surface and observed by scanning tunneling microscopy. The configuration of the hydrogen bonding in the 2-D structure of 5,10,15,20-tetrakis (4-carboxylphenyl)-21H,23H-porphyrin (TCPP) is found to be different from that in the 3-D structure in bulk crystal. The difference of these structures from that expected from the bulk crystal is attributed to the effect of minimization of surface free energy in the 2-D system, which leads to close packing symmetry of molecules on the substrate.