Scanning tunnelling microscopy experiments were carried out employing a PicoLE (Keysight) or Molecular Imaging (Agilent Technologies) STM operating in constant-current mode at room temperature. STM tips were mechanically cut using Pt/Ir wire (80/20, diameter 0.25 mm, Advent Research Materials). Prior to every STM experiment at the solid/liquid interface, highly oriented pyrolytic graphite substrate (grade ZYB, Momentive Performance Materials) was rinsed with acetone and freshly cleaved using Scotch tape. After this, the solution was drop casted on the substrate and started scanning at room temperature for a designated time ranging from 3-8 h. 1 mg of solid was weighed and added to 1 mL solvent i. e. asreceived heptanoic acid (Merck). Sonication was used to dissolve the materials which resulted in a saturated solution. After this, a 10% dilution was created in the same solvent. STM imaging parameters such as I set and U bias are shown in each figure and correspond to the tunnelling current and applied substrate bias. STM images were graphite-calibrated using Scanning Probe Imaging Processor software (SPIP, Image Metrology). Molecular models were created using HyperChem™ software (version 8.0.1) as described in the Electronic Supplementary Information (ESI).