Adsorption of cobalt (II) octaethylporphyrin and 2H-octaethylporphyrin on Ag(111): new insight into the surface coordinative bond

Communication: Influence of graphene interlayers on the interaction between cobalt phthalocyanine and Ni(111)

“…The intermediate spectra can be described essentially as a superposition of the monolayer spectrum and the spectrum of the thicker film. This behavior reminds now to CoPc on Ag(111) 16,19 and Au(100) 24 and to related cobalt porphyrin molecules on Ag(111) 29 and Au(111). 30 Analogously, we ascribe the interface peak to a change of the electronic configuration of the cobalt atom caused by a charge transfer from the metal substrate to the cobalt atom of the CoPc molecule.…”

Surface chemistry of porphyrins and phthalocyanines

“…As an example, Fig. 23 displays STM images of a mixture of CoOEP and 2HOEP on Ag(1 1 1) [426]. The CoOEP molecules show a central protrusion, which is related to the Co ion, while the 2HOEP molecules are imaged with a dark center.…”

Substrate Registry in Disordered Layers of Large Molecules

“…Similar localized interactions between N atoms in molecules and substrate metal atoms were proposed recently. [24][25][26] Even without deeper knowledge about the actual nature of the bonds between N-pyridyl in 2,4'-BTP and underlying metal atoms, it is reasonable to assume that the overall gain in interaction energy per molecule can be maximized when the N atoms are sited as close as possible to atop positions above the substrate metal atoms. Local "fine tuning" may then occur via the local vertical distances.…”

“…This might be the case when certain sites within the molecule are specifically attracted by certain sites of the substrate. [24][25][26] In a limiting case, the orientation of the individual molecules will then be decisive for the orientation of the entire adlayer. Any predictive analysis would then have to start with the preferences of an individual adsorbate, and would consider the aforementioned coincidence conditions in a second step.…”

“…An aligning lock-and-key interaction of the described form can be expected for larger molecules that include two or more particularly reactive centers such as sulfur, nitrogen, oxygen, metal atoms, or even additional side groups. [9,[24][25][26][27] Using the oligopyridine molecule 2-phenyl-4,6-bis[6-(pyridine-2-yl)-4-(pyridine-4-yl)pyridine-2-yl]-pyrimidine (2,4'-BTP, Figure 1) [28] as example, we have recently shown that a distinct affinity of N to metal atoms [29,30] can explain the orientation of ordered adlayers formed by these molecules on Au(111) and on (111)-oriented Ag layers on Ru(0001). [31] The angles could be predicted by a geometric fit model requiring very few system specific details.…”