A5027828020- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Molecular Junctions and Nanostructures
- Porphyrin and Phthalocyanine Chemistry
- Magnetic properties of thin films
- Photoreceptor and optogenetics research
- Photochromic and Fluorescence Chemistry
- Crystallography and molecular interactions
- Surface Chemistry and Catalysis
- Metal complexes synthesis and properties
- Metallic Glasses and Amorphous Alloys
- Advanced biosensing and bioanalysis techniques
- Quantum and electron transport phenomena
- Magnetic Properties of Alloys
- Electron Spin Resonance Studies
Freie Universität Berlin
2015-2021
Institute of Experimental Physics of the Slovak Academy of Sciences
2015
Indian Institute of Technology Delhi
2012
Spin crossover (SCO) complexes possess a bistable spin state that reacts sensitively to changes in temperature or excitation with light. These effects have been well investigated solids and solutions, while technological applications require the immobilization contacting of molecules at surfaces, which often results suppression SCO. We report on thermal light-induced SCO [Fe(bpz)2phen] direct contact highly oriented pyrolytic graphite surface. are able switch magnetic moment by illumination...
Abstract Cooperative effects determine the spin-state bistability of spin-crossover molecules (SCMs). Herein, ultimate scale limit at which cooperative spin switching becomes effective is investigated in a complex [Fe(H 2 B(pz) ) (bipy)] deposited on highly oriented pyrolytic graphite surface, using x-ray absorption spectroscopy. This system exhibits complete thermal- and light-induced transition thicknesses ranging from submonolayers to multilayers. On increasing coverage 0.35(4) 10(1)...
To investigate the ability for spin-state switching of spin-crossover (SCO) complexes adsorbed to solid substrates, SCO complex [Fe(H2B(pz)2)2(phenme4)] (pz = pyrazole, phenme4 3,4,7,8-tetramethyl-1,10-phenanthroline) is prepared. The new investigated by magnetic susceptibility measurements and Mößbauer spectroscopy in state temperature-dependent UV/vis a thin film deposited physical vapor deposition (PVD) on quartz glass. Thermal- light-induced observed bulk Submonolayers this obtained PVD...
Vacuum-evaporable Fe(<sc>ii</sc>) complexes exhibit greatly different spin-crossover behaviour in thin films deposited from the gas phase and crystalline bulk.
For probing the nature of spin-state switching in spin-crossover molecules adsorbed on surfaces, x-ray absorption spectroscopy has emerged as a powerful tool due to its high sensitivity and element selectivity tracing even subtle electronic, magnetic, or chemical changes. However, x-rays itself can induce spin transition might have unwanted influence while investigating effect other stimuli such temperature light, surface, behaviour. Herein, we present an Fe(II) complex highly oriented...
X-ray absorption spectroscopy investigations of the spin-state switching spin-crossover (SCO) complexes adsorbed on a highly-oriented pyrolytic graphite (HOPG) surface have shown so far that HOPG is promising candidate to realize applications such as spintronic devices because stability SCO and possibility highly efficient thermal light-induced switching. Herein, we present spin several Fe(II) an with particular emphasis thermally induced transition behaviour respect different structural...
Porphyrin molecules are particularly interesting candidates for spintronic applications due to their bonding flexibility, which allows modify properties substantially by the addition or transformation of ligands. Here, we investigate electronic and magnetic cobalt octaethylporphyrin (CoOEP), deposited on copper substrates with two distinct crystallographic surface orientations, Cu(100) Cu(111), X-ray absorption spectroscopy (XAS) circular dichroism (XMCD). A significant moment is present in...
Studies on the spin-state switching characteristics of surface-bound thin films spin-crossover (SCO) complexes are interest to harness device utility SCO complexes. Molecule–substrate interactions govern in direct contact with underlying substrates. In this study, we elucidate role molecule–substrate thermal- and light-induced a functional SCO-complex—[Fe(H2B(pz)2)2COOC12H25-bipy] (pz = pyrazole, C12-bpy dodecyl[2,2′-bipyridine]-5-carboxylate) deposited at submonolayer coverage highly...
Abstract Photochromic molecular switches immobilized by direct contact with surfaces typically show only weak response to optical excitation, which often is not reversible. In contrast, here, it shown that a complete and reversible ring‐opening ring‐closing reaction of submonolayers spironaphthopyran on the Bi(111) surface possible. The ring opening merocyanine isomer initiated ultraviolet light. Switching occurs in two‐step process, after an energy barrier needs be overcome convert form....
Diarylethenes are molecular switches, the state of which can efficiently be controlled by illumination with ultraviolet or visible light. To use change in properties when switching between two states for a specific function, direct contact solid surfaces is advantageous as it provides immobilization. Here we present study diarylethene derivate (T-DAE, 1,2-bis(5-methyl-2-phenylthiazol-4-yl)cyclopent-1-ene) highly ordered graphite well semimetallic Bi(1 1 1) x-ray photoelectron spectroscopy,...
Controlling molecules in direct contact with surfaces is central to molecular electronics. Photochromic immobilized and contacted by a surface promise provide remote control on the level using light. Combining X-ray absorption spectroscopy, differential reflectance density functional theory, we demonstrate highly efficient bidirectional photochromism of spirooxazine switch Au(111) surface. The ring-opening reaction UV light 2 orders magnitude more than previously reported for other...