Christian Feiler

Christian Feiler
Helmholtz-Zentrum Hereon | HZG

PhD

About

42
Publications
5,860
Reads
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1,200
Citations
Education
August 2011 - September 2016
Otto Diels Institute of Organic Chemistry, CAU Kiel, Germany
Field of study
  • Chemistry

Publications

Publications (42)
Article
Full-text available
The large amount of corrosion inhibition efficiencies in literature, calls for a more efficient way to organize, access and compare this information. The CORDATA open data management application (https://datacor.shinyapps.io/cordata/) can help select appropriate corrosion inhibitors for application specific challenges.
Article
Full-text available
Effective protective coatings are an essential component of lightweight engineering materials in a large variety of applications as they ensure structural integrity of the base material throughout its whole service life. Layered double hydroxides (LDHs) loaded with corrosion inhibitors depict a promising approach to realize an active corrosion prot...
Article
Full-text available
The degradation behaviour of magnesium and its alloys can be tuned by small organic molecules. However, an automatic identification of effective organic additives within the vast chemical space of potential compounds needs sophisticated tools.Herein, we propose two systematic approaches of sparse feature selection for identifying molecular descript...
Article
Aqueous Mg batteries are promising energy storage and conversion systems to cope with the increasing demand for green, renewable and sustainable energy. Realization of high energy density and long endurance system is significant for fully delivering the huge potential of aqueous Mg batteries, which has drawn increasing attention and investigations...
Poster
Full-text available
Degradation and damage of a material caused by the influence of adverse environments has a significant impact on the lifetime of products and infrastructures. Hence, reducing the impact of corrosion and the development of effective protection measures is an important step in saving costs and burden on natural resources. Corrosion is a multi physica...
Article
Until now, detecting weak spots in composite structures remains a key challenge in the aviation industry. The correct assessment of the load-bearing capability after structural overloading or the occurrence of barely-visible damages is particularly important to maintain structural integrity. Nonetheless, a reliable and overarching non-destructive i...
Article
Full-text available
Chemists usually synthesize molecules using stochastic bond-forming collisions of the reactant molecules in solution. Nature follows a different strategy in biochemical synthesis. The majority of biochemical reactions are driven by machine-type protein complexes that bind and position the reactive molecules for selective transformations. Artificial...
Article
The individual and combined influence of 53 small molecule bio-relevant organic compounds on the corrosion of CP Mg and Mg-0.8Ca is investigated. The results demonstrate that tested amino acids, vitamins and saccharides, do not critically influence the in vitro corrosion of tested materials. The presence of penicillin and streptomycin at low concen...
Article
Full-text available
Femtosecond time-resolved absorption measurements of a magnetically bi-stable azopyridine Ni-porphyrin in solution at room temperature show that the photo-induced dynamics are dominated by transient low-spin ⇄ high-spin interconversion involving Ni (d ² ) and (d, d) states.
Article
Diazocines, bridged azobenzenes, exhibit superior photo-physical properties compared to parent azobenzenes such as high switching efficiencies, quantum yields, and particularly switching wavelengths in the visible range. Synthesis, however, proceeds with low yields, and derivatives are difficult to prepare. We now present two heterodiazocines which...
Article
We herein report the synthesis and switching properties of an azo-1-methylimidazole-functionalized Ni2+ porphyrin. Upon irradiation and cis/trans isomerization of the azo unit, 1-methylimidazole is reversibly coordinated as an axial ligand to the Ni2+ porphyrin. Consequently, the Ni2+ is switched between a diamagnetic low-spin state (trans) and a p...
Article
Full-text available
Azo-N-methylimidazole functionalized Ni(ii)porphyrins were rationally designed and synthesized and their performance as molecular spin switches was investigated. They perform intramolecular light-driven coordination-induced spin state switching (LD-CISSS) in the presence of water and therefore are an important step towards spin switches for medicin...
Article
Light switchable azoimidazoles were rationally designed, synthesized, and their performance was investigated as photodissociable ligands (PDL), and for spin state switching of Ni-porphyrins. The rationally designed ligands exhibit a high photochemical conversion rate (trans --> cis > 98%), and no measurable fatigue over a large number of switching...
Article
Indeno[1,2-b]fluorenes (IFs), while containing 4np-electrons, are best described as two aromatic benzene rings fused to a weakly paratropics-indacene core. In this study, we find that replacement of the outer benzene rings of an IF with benzothiophenes allows the antiaromaticity of the centrals-indacene to strongly reassert itself. Herein we report...
Article
We present the first coordination-induced spin-state switching with nickel chlorin and nickel isobacteriochlorin. The spin-state switching was monitored by UV-vis spectroscopy and NMR titration experiments. The association constants (K1 and K2) and thermodynamic parameters (ΔH and ΔS) of the coordination of pyridine were determined. The first X-ray...
Article
Molecules with Möbius topology have drawn increasing attention from scientists in a variety of fields, such as organic chemistry, inorganic chemistry, and material science. However, synthetic difficulties and the lack of functionality impede their fundamental understanding and practical applications. Here, we report the facile synthesis of an aggre...
Article
Full-text available
Triazatriangulenium (TATA) platform molecules allow the preparation of functionalized surfaces with well-defined lateral spacings of freestanding functional groups. Using scanning tunneling microscopy, synchrotron-based X-ray photoelectron spectroscopy, near edge X-ray absorption fine structure spectroscopy and complementary density functional theo...
Article
We present a fully reversible and highly efficient on-off photo switching of magnetic resonance imaging (MRI) contrast with green (500 nm) and violet-blue (435 nm) light. The contrast change is based on the intramolecular Light-Driven Coordination-Induced Spin State Switch (LD-CISSS) which was performed with azopyridine substituted Ni-porphyrins. T...
Article
Full-text available
The conductances of molecular model junctions comprising a triazatriangulenium platform with or without an ethynyl spacer and an upright Zn-porphyrin are probed with a low-temperature scanning probe microscope. The platform alone is found to be highly conductive. The ethynyl-linked Zn-porphyrin moiety reduces the conductance by three orders of magn...
Article
Full-text available
Extensive use of quantum chemical calculations has been made to rationally design a molecule whose spin state can be switched reversibly using light of two different wavelengths at room temperature in solution. Spin change is induced by changing the coordination number of a nickel complex. The coordination number in turn is switched using a photoch...
Article
Full-text available
Spectroscopic evidence of a reversible, photoinduced trans ↔ cis photoisomerization is provided for an azobenzene-functionalized triazatriangulene (TATA) platform on Au(111). As shown by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS), these molecules form a well-ordered self-assembled monolayer (SAM) on Au(111). The...
Article
The controlled attachment of chromophores to metal or semiconducting surfaces is a prerequisite for the construction of photonic devices and artificial surface based light harvesting systems. We present an approach to mount porphyrins in ordered monolayers on Au(111) by self-assembly and verify it, employing STM, absorption spectros-copy, and quant...
Article
Zwei stabile, kernmodifizierte Rubyrine mit einer oder zwei Diethienylethen(DTE)-Einheiten (1 und 2) wurden hergestellt. Das Rubyrin 1 mit einer “geschlossenen” DTE-Einheit zeigt 26 π-Aromatizität, während bei Einführung einer “offenen” DTE-Einheit in den Makrocyclus 2 dieser sich als nichtaromatische Verbindung verhält.
Article
Two stable core-modified rubyrins bearing one and two dithienylethene (DTE) units (1 and 2) have been synthesized. With one "closed-form" DTE unit, 1 shows aromaticity associated with its conjugated circuit of 26 π-electrons. In contrast, rubyrin 2 containing one "open-form" DTE unit has nonaromatic properties.
Article
Octyl functionalized triazatriangulenium (tri-octyl-TATA) deposited on Au(111) and Ag(111) surfaces by electrospray ionization is investigated using low temperature scanning tunneling microscopy. The molecule surprisingly adsorbs with gauche conformations of the octyl groups rather than in the anti form. We observe chiral amplification in the islan...
Article
The bistability of spin states (e.g., spin crossover) in bulk materials is well investigated and understood. We recently extended spin-state switching to isolated molecules at room temperature (light-driven coordination-induced spin-state switching, or LD-CISSS). Whereas bistability and hysteresis in conventional spin-crossover materials are caused...
Article
Easy as π: A stable nonaromatic heteroporphyrin bearing a thienopyrrole moiety has been prepared. The nonaromatic nature of this compound is clearly evident based on UV/Vis absorption, (1) H NMR spectroscopy, and theoretical calculations. Single-crystal X-ray analysis demonstrates that the molecule adopts a planar conformation with clear alternatio...
Article
The photo- and thermally induced switching of well-ordered molecular arrays of free-standing functional groups, formed by self-assembly on Au surfaces, were studied by photoelectrochemical methods (cyclic voltammetry, chronoamperometry) and surface plasmon resonance spectroscopy. These molecular adlayers exhibit azobenzene functions mounted vertica...
Article
The electronic properties of FePc molecules adsorbed on hydrogen-passivated Si(111) surfaces are investigated by scanning tunneling microscopy at low temperatures. Spatially resolved spectroscopy reveals a significant variation of the electronic states at different positions above the molecule. The highest occupied ligand- and metal-based orbitals...
Article
In contrast to azobenzenes, heterocyclic azo compounds are less well investigated. Phenylazoimidazoles would be versatile as photodissociable ligands (PDLs) because imidazole is an important donor in coordination chemistry. Here, we present the synthesis of 4- and 5-phenylazoimidazoles via a novel azo-coupling method. 1,2-Protected imidazole is lit...
Article
Magnetic bistability in spin-crossover materials generally is a collective phenomenon that arises from the cooperative interaction of a large number of microscopic magnetic moments within the crystal lattice in the solid state. We now report on individual molecules in homogeneous solution that are switched between the diamagnetic and paramagnetic s...
Article
Irradiation of compound (II) with sunlight leads to the formation of the oxido-bridged diheptamolybdate (III).
Article
Treatment of MoO3 with butan-1-amine (BuNH2) or pyrrolidine (PyrNH2) results in the formation of (BuNH3)8[(Mo7O24)(MoO4)]·3H2O (1; BuNH3 = butan-1-aminium) or (PyrNH2)6[(Mo7O24]·2H2O (2; PyrNH2 = pyrrolidinium), respectively. On irradiation with sunlight, compound 1, which is an organic heptamolybdate [Mo7O24]6– that contains a cocrystallized monom...

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Projects

Projects (3)
Project
We establish an Open Innovation Platform for modelling supported design of inhibiting active protective coatings and corresponding accelerator tests for assessing their in-service durability. The main focus of the project is to promote development of a green technology for smart protective coatings based on materials modelling and optimization.
Project
Chromates have been very effective corrosion inhibitors but are now being banned due to their carcinogenicity. This project aims to use high throughput experiments coupled with machine learning to understand structure-property relationships in small organic corrosion inhibitors and to design better inhibitors to help reduce the $1 trillion cost of corrosion in industry