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Growth of covalently bonded Sierpiński triangles up to the second generation
- Gu, Gaochen, Li, Na, Liu, Liwei, Zhang, Xue, Wu, Qimeng, Nieckarz, Damian, Szabelski, Pawel, Peng, Lianmao, Teo, Boon K., Hou, Shimin, Wang, Yongfeng
- RSC advances 2016 v.6 no.71 pp. 66548-66552
- annealing, chemical bonding, gold, scanning tunneling microscopy, schiff bases, temperature
- Growth of covalently bonded Sierpiński triangles (CB-STs) on metal surfaces was investigated by scanning tunneling microscopy (STM). Three synthetic strategies (namely, dehydration condensation, cyclotrimerization coupling and Schiff-base reactions) were used to fabricate CB-STs. Second-generation CB-STs were obtained at the solid–vacuum interface utilizing the Schiff-base reaction between 4,4′′-dialdehyde-1,1′:3′,1′′-terphenyl (TPDAL) and 1,3,5-tris(4-aminophenyl)benzene (TAPB) on Au(111). The CB-ST patterns persist at annealing temperatures as high as 500 K. Homotactic three-fold motifs, insufficient migration and irreversible covalent reaction are the main limitations for growing higher-generation STs. The present results provide new insights on the growth of STs on metal surfaces.