Fig. 2: Overviews of halogen bonded clusters and selectivity of halogen bonds.
From: Surface-controlled reversal of the selectivity of halogen bonds
a, b, d, e STM overview scans of BrparaImeta-TP and IparaBrmeta-TP on Cu(111) and Au(111). The insets give the total numbers of counted molecules that were found in clusters of a certain size. The dashed blue boxes indicate typical windmills and dimers as analyzed in Fig. 3. c, f Chemical structures of BrparaImeta-TP (used in a, b) and IparaBrmeta-TP (used in d, e). g, h Statistical distribution of Br⋯Br, I⋯I, and Br⋯I halogen bonds on Cu(111) and Au(111), respectively. On Cu(111) only dimers and trimers and on Au(111) only dimers are analyzed. The total number of counted halogen bonds are given in parentheses. Para–para, para–meta, or meta–meta connections are indicated by italic letters. The dashed black lines represent the statistical 25:50:25% distribution that would be observed if Br⋯Br, Br⋯I, and I⋯I connections were equal in strength. Parameters: sample bias voltage U = 100 mV, tunneling current I = 10 pA (a, b, e) and I = 100 pA (d).
