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(a) Molecular structures of the terpyrimidinethiols ([2,5′:2′,5″-terpyrimidine]-2″-thiol, 3Ndown, and [2,5′:2′,5″-terpyrimidine]-5-thiol, 3Nup), unsubstituted terpyrimidine (3N), and terphenyl (3P). The permanent dipole moments of the pyrimidines are indicated by black arrows (direction defined as pointing from negative to positive charge). (b) Top view of the investigated monolayers in the (√3 × 3) surface unit-cell. The Cartesian axes are indicated.
