Fig. 1
From: Selective on-surface covalent coupling based on metal-organic coordination template
Reaction pathways of p-DBTB on Au(111). The precursor 1,4-bis(6,6”-dibromo-[2,2’:6’,2”-terpyridin]-4’-yl)benzene (p-DBTB) is flexible as the bipyridine (bpy) fragments can adopt cis- or trans-conformation. a Uncontrolled C–C coupling. The p-DBTB forms inhomogeneous polymorphic structures after annealing at 430–661 K, where diverse bonding modes coexist. The as-formed C–C bonds are highlighted in red. b Fe-tpy coordination templated macrocyclization. The template effect of the Fe-tpy coordination leads to a distinct reaction pathway, generating C-Au-C organometallic intermediates after annealing at 397–566 K and conjugated SPy-p-Ph nanoribbons at 578–705 K
