STM Investigation of Temperature-Dependent Two-Dimensional Supramolecular Architectures of C60 and Amino-tetraphenylporphyrin on Ag(110)

• Published in: Langmuir Vol. 26; no. 4; pp. 2466 - 2472
• Main Authors: Di Marino, M, Sedona, F, Sambi, M, Carofiglio, T, Lubian, E, Casarin, M, Tondello, E
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 16.02.2010
• Subjects: Chemistry; Colloidal state and disperse state; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fullerenes - chemistry; Fullerenes and related materials; diamonds, graphite; General and physical chemistry; Interfaces: Adsorption, Reactions, Films, Forces; Macromolecular Substances - chemistry; Materials science; Microscopy, Scanning Tunneling; Particle Size; Physics; Porous materials; Porphyrins - chemistry; Silver - chemistry; Specific materials; Surface physical chemistry; Surface Properties; Temperature; Self assembly; Annealing; Nitrogen heterocycle; Evaporation; Porous material; Substrate; Scanning tunneling microscopy; Pore; Sequential; Porphyrin; Phase separation; Fullerenes; Structural model; Low temperature; Nanoporosity; Long range order
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/la9026927

Multicomponent supramolecular self-assemblies of exceptional long-range order and low defectivity are obtained if C60 and 5-(4-aminophenyl)-10,15,20-triphenylporphyrin (TPP-NH2) are assembled on Ag(110) by sequential evaporation in the submonolayer range of TPP-NH2 and fullerene on the substrate surface and subsequent annealing. A (±2 −3, 6 ± 3) array consisting of supramolecular stripes of a 1:1 C60/TPP-NH2 2D adduct develops at 410 K (the low temperature, LT, phase). If the LT phase is annealed at 470 K, then a 3:1 fullerene/TPP-NH2 (±3 −5, 5 ± 5) nanoporous array (the HT phase) forms, with each pore containing a single porphyrin molecule. Phase separation occurs by annealing the HT phase at 520 K. Structural models are proposed and discussed on the basis of the experimental scanning tunneling microscopy results.