As it can be observed in Figure , the evaporation of I-BOPHY-I molecules on Ag(111) at RT already leads to the formation of linear chains, similar to those discerned on the Au(111) surface at 370 K. The STM image shows large and brighter islands of molecules forming a linear arrangement and, in the region between these islands, some small and darker aggregates. Within the molecular islands, it is possible to discern linear chains aligned along three different orientations, rotated by 120° among them, and oriented along the substrate [2-1-1] symmetry direction. To better identify the features constituting the linear chains, HR-STM images were recorded (see Figure ). The periodicity along chains is again around 1.3 nm, which suggests the presence of metalorganic I-BOPHY-Ag-BOPHY-I oligomers, already at RT, as a consequence of the complete dehalogenation of the molecules. Such results are not surprising, as a lower dehalogenation temperature on Ag(111) than on Au(111) has been previously reported . The iodine atoms that are released from the BOPHY molecules upon the dehalogenation process at RT form the small aggregates outside the striped molecular areas (see Figure and Figure ). Similarly, to the Au(111) case, the XPS characterization was used to reveal the chemical configuration of the molecular layer. Figure shows the F 1s spectrum with the characteristic single component at 685.9 eV related to the B-F bond within the BOPHY core, together with the I 3d spectrum that presents a main peak at 619.0 eV (I-Ag) and a smaller one at 620.7 eV (I-C). It should be noted that it is well-known that iodinated molecules tend to undergo a complete dehalogenation already at RT on Ag(111) given the more labile nature of the C-I bond with respect to the C-Br bond . The incomplete dehalogenation observed here may be mostly ascribed to steric effects, where the present coverage, larger than that of STM images, inhibits further dehalogenation when molecules are trapped at surface regions already saturated by iodine atoms. Contribution to the I-C signal from second layer molecules is unlikely because this should give rise to a core level shift to higher binding energy of the corresponding F, N and C 1s peaks, which is not observed. The C 1s XPS spectrum confirms the formation of a C-Ag metal-organic bond at RT as inferred from the development of a component at 283.2 eV, as well as the dehalogenation of the majority of the molecules, with a residual minority C-I component at 284.8 eV. Thus, while on Au(111) the complete dehalogenation was taking place at 370 K, on Ag(111) this reaction is already achieved at RT. Similar results of molecular dehalogenation and formation of metal-organic nanostructures at RT have been reported in literature . It should be noted that most of the halogenated molecules (> 60%) will contribute to the growth of the nanostructures upon annealing to 370 K, with only a small fraction desorbing from the surface (the total intensity of the I 3d spectrum after annealing is found to be 90% of that deposited at RT), see quantitative XPS analysis in Table of ESI file.