The organization of 2,3-iron-naphthalocyanine molecules on substrate as revealed by scanning tunneling microscopy

Abstract

Surface morphology of thin molecular layer of 2,3-1ron-naphthalocyanine (2,3 FeNPc) was studied by scanning tunneling microscopy (STM) at the ambient conditions. Organic layer with thickness of 40 nm was vapour phase deposited on amorphous carbon substrate.The STM images have revealed the pecularities of surface molecular organization from large range (hundreds of nm) down to atomic scale. Arrays of locally ordered linear stuctures have been distinguished as the main morhological features of the examined surface. At several places the well-ordered STM patterns have been distinguished at the atomic scale. They can be described as stacks of periodicity approximatelly 0.4 nm in a row and 1.5 nm between stacks. These results can be explained by arrangement of 2,3-FeNPh molecules in stacks with a main plane being perpendicular to the substrate surface.

Tunneling Voltage Polarity Dependent Submolecular Contrast of Naphthalocyanine on Graphite. A STM Study of Close-Packed Monolayers under Ultrahigh-Vacuum Conditions

“…So far, there have been few reported imaging studies of Nc in the literature. For layers of FeNc several nanometers thick on an amorphous carbon substrate, 20 ZnNc on MoS 2 21 and CoNc on NaCl, 22 the molecules are reported to adsorb with their plane perpendicular to the surface and the stacking axis parallel to the substrate. On the other hand for vanadyl-Nc on HOPG, a stacking axis perpendicular to the substrate and slightly tilted molecules have been proposed.…”

Influence of the central metal on the structural, electronic, and spectroscopic properties of naphthalocyanine complexes: density functional theory calculations

“…For layers of FeNc several nanometers thick on an amorphous carbon substrate [18], ZnNc on MoS 2 [19], and on NaCl [20], the molecules are reported to adsorb with their plane perpendicular to the surface and the stacking axis parallel to the substrate. Experimental UV-Vis spectra for ZnNc dissolved in DMSO show absorption bands at 767 and 332 nm [21], while those for CoNc dissolved in pyridine show bands at 750 and 321 nm [22] and those for SiNc [23] in DMF show a Q band centered at 778 nm, followed by a transparent region (500-600 nm) and a B band located near 335 nm.…”