Electronic Structure of FePc and Interface Properties on Ag(111) and Au(100)

We have examined the geometric and electronic structures of iron phthalocyanine assemblies on a Cu(111) surface at different sub- to mono-layer coverages and the changes induced by thermal annealing at temperatures between 250 and 320 °C by scanning tunneling microscopy, x-ray photoelectron spectroscopy, and x-ray absorption spectroscopy. The symmetry breaking observed in scanning tunneling microscopy images is found to be coverage dependent and to persist upon annealing. Further, we find that annealing to temperatures between 300 and 320 °C leads to both desorption of iron phthalocyanine molecules from the surface and their agglomeration. We see clear evidence of temperature-induced homocoupling reactions of the iron phthalocyanine molecules following dehydrogenation of their isoindole rings, similar to what has been observed for related tetrapyrroles on transition metal surfaces. Finally, spectroscopy indicates a modified substrate-adsorbate interaction upon annealing with a shortened bond distance. This finding could potentially explain a changed reactivity of Cu-supported iron phthalocyanine in comparison to that of the pristine compound.

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“…Similar observations have been made for the adsorption of CoPc on the Cu(111) 33 and FePc on the Ag(111) surface. 34 In the spectra in Fig. 7,…”

Section: X-ray Photoelectron Spectroscopy and X-ray Absorption Spectrmentioning

confidence: 97%

Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing

Snezhkova

Bischoff

et al. 2016

The Journal of Chemical Physics

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“…[16][17][18][19] Transition metal phthalocyanines with an open shell structure of the central ion molecular orbitals, strongly interact with the metal substrates, affecting the electronic, optical, and magnetic properties of the organic/metal interface, thus influencing the performances of the molecular device. 10,20,21 In this paper, we determine the adsorption energy of FePc and CoPc adsorbed on Au(110), with respect to CuPc/Au(110), as estimated by Temperature Programmed Desorption (TPD). The interfacial charge transfer between FePc and CoPc, and the Au(110)-(1×2) metallic surface, has been studied by means of core-level and valence band photoemission spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Metal-phthalocyanine ordered layers on Au(110): Metal-dependent adsorption energy

Massimi

Angelucci

Gargiani

et al. 2014

The Journal of Chemical Physics

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Iron-phthalocyanine and cobalt-phthalocyanine chains, assembled along the Au(110)-(1×2) reconstructed channels, present a strong interaction with the Au metallic states, via the central metal ion. X-ray photoemission spectroscopy from the metal-2p core-levels and valence band high-resolution ultraviolet photoelectron spectroscopy bring to light signatures of the interaction of the metal-phthalocyanine single-layer with gold. The charge transfer from Au to the molecule causes the emerging of a metal-2p core level component at lower binding energy with respect to that measured in the molecular thin films, while the core-levels associated to the organic macrocycle (C and N 1s) are less influenced by the adsorption, and the macrocycles stabilize the interaction, inducing a strong interface dipole. Temperature Programmed Desorption experiments and photoemission as a function of temperature allow to estimate the adsorption energy for the thin-films, mainly due to the molecule-molecule van der Waals interaction, while the FePc and CoPc single-layers remain adsorbed on the Au surface up to at least 820 K. © 2014 AIP Publishing LLC

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“…In this context, many important investigations into structural and electronic properties of phthalocyanines have been achieved by using various surface science techniques. While a review of this wide field is beyond the scope of this article, we list a few most recent results obtained from ultraviolet 1, 2 and X-ray 3, 4 photoelectron spectroscopy, inverse photoelectron spectroscopy, 5,6 electron energy loss spectroscopy, 7 near-edge X-ray absorption fine a E-mails: yongfengwang@pku.edu.cn, kaiwu@pku.edu.cn 2158-3226/2012/2(4)/041402/10 C Author(s) 2012 2, 041402-1 structure, 8,9 normal incidence X-ray standing waves, 10 low-energy electron diffraction 11,12 and reflection high-energy electron diffraction. 13 In particular, the scanning tunneling microscopy (STM) has been extensively used to explore the structural and electronic features of these molecules at the submolecular level in real space.…”

Section: Introductionmentioning

confidence: 99%

Review Article: Structures of phthalocyanine molecules on surfaces studied by STM

Wang¹,

Wu²,

Berndt³

2012

AIP Advances

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This review mainly focuses on progress recently achieved in the growth of phthalocyanine molecules on single-crystal surfaces of sub-monolayer up to few-monolayer thin films studied by scanning tunneling microscopy in our groups. On metallic surfaces such as Au(111), Ag(111) and Cu(111), molecular superstructures are determined by combining directional intermolecular interactions caused by symmetry reduction, molecule-substrate interactions and indirect long-range interactions due to quantum interference of surface state electrons. On semiconducting TiO2 surface, molecular assembling structures are dictated by the strong molecule-substrate interaction. However, on insulating NaCl film, molecule-molecule interaction dominates over the molecule-NaCl coupling, leading to molecular growth behavior. Knowledge obtained from these studies would help people better understand the physicochemical properties of the phthalocyanine molecules at surfaces so that their new applications could be further explored and uncovered in the future

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Electronic Structure of FePc and Interface Properties on Ag(111) and Au(100)

Cited by 79 publications

References 37 publications

Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing

Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing

Metal-phthalocyanine ordered layers on Au(110): Metal-dependent adsorption energy

Review Article: Structures of phthalocyanine molecules on surfaces studied by STM

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