A5050561740- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Metal complexes synthesis and properties
- Lanthanide and Transition Metal Complexes
- Crystallography and molecular interactions
- Metal-Catalyzed Oxygenation Mechanisms
- Metal-Organic Frameworks: Synthesis and Applications
- Organometallic Complex Synthesis and Catalysis
- Coordination Chemistry and Organometallics
- Polyoxometalates: Synthesis and Applications
- Electron Spin Resonance Studies
- Asymmetric Synthesis and Catalysis
- Advanced NMR Techniques and Applications
- Nanocluster Synthesis and Applications
- Catalysis and Oxidation Reactions
- Vanadium and Halogenation Chemistry
- Metalloenzymes and iron-sulfur proteins
- Catalytic Processes in Materials Science
- Transition Metal Oxide Nanomaterials
- Porphyrin and Phthalocyanine Chemistry
- Advanced Data Storage Technologies
- Chemical Synthesis and Analysis
- Crystal structures of chemical compounds
- Synthesis and characterization of novel inorganic/organometallic compounds
Johannes Gutenberg University Mainz
2016-2025
University of Applied Sciences Mainz
2014-2020
Universitat Jaume I
2009
University of Strathclyde
2009
Newcastle University
2009
Luminescence from Earth-abundant metal ions in solution at room temperature is a very challenging objective due to the intrinsically weak ligand field splitting of first-row transition ions, which leads efficient nonradiative deactivation via metal-centered states. Only handful 3dn complexes (n ≠ 10) show sizable luminescence temperature. near-infrared spectral region even more difficult achieve as further pathways come into play. No have displayed emission >1000 nm up now. Here, we report...
Gaining chemical control over the thermodynamics and kinetics of photoexcited states is paramount to an efficient sustainable utilization photoactive transition metal complexes in a plethora technologies. In contrast energies charge transfer described by spatially separated orbitals, spin-flip cannot straightforwardly be predicted as Pauli repulsion nephelauxetic effect play key roles. Guided multireference quantum calculations, we report novel highly luminescent emitter with chemically...
Syntheses, characterization, and magnetic properties of a series diphenoxo-bridged discrete dinuclear M(II)Ln(III) complexes (M = Cu or Ni, Ln Ce-Yb) derived from the compartmental Schiff base ligand, H(2)L, obtained on condensation 3-ethoxysalicylaldehyde with trans-1,2-diaminocyclohexane, are described. Single crystal X-ray structures eight Cu(II)Ln(III) compounds (Ln Ce (1), Pr (2), Nd (3), Sm (4), Tb (7), Ho (9), Er (10), Yb (12)) three Ni(II)Ln(III) (13), (16), Gd (18)) have been...
Abstract Trinuclear ferrocene tris‐amides were synthesized from an Fmoc‐ or Boc‐protected amino acid, and hydrogen‐bonded zigzag conformations determined by NMR spectroscopy, molecular modelling, X‐ray diffraction. In these ordered secondary structures orientation of the individual amide dipole moments approximately in same direction results a macrodipole moment similar to that α‐helices composed α‐amino acids. Unlike ordinary acids, building blocks amides with defined structure can be...
In this manuscript we report the synthesis of three methanol solvatomorphs Fe(II) complexes with 2‐(2‐phenyl)‐5‐[N,N‐bis(2‐pyridylmethyl)aminomethyl]‐1,3,4‐oxadiazole (LPh‐ODA) ligand and different NCE co‐ligands where E = S, Se BH3 (C1‐C3). The obtained were characterized by single crystal X‐ray crystallography SQUID magnetometry between 2 and300 K. Complexes C1 C2 remain in high spin state over entire measured temperature window, whereas complex C3 exhibits a solvent dependent transition...
Abstract Check M(etal)ate: The chessboard and the figures represent a special reaction in which different low‐polarity metals can metalate arenes directly when they are brought into right position. In combination of queen (sodium) knight (chromium or iron), it is possible for (usually weaker piece) to make direct deadly hit on king (benzene) this game elemental chess. magnified image
The new complex [Co(III)2Dy(III)2(OMe)2(teaH)2(Piv)6] in the {Co(III)2Dy(III)2} family, shows two well resolved thermal activated magnetization relaxation pathways under AC experiments zero DC field. Fitted crystal field parameters suggest that origin of these relies on different excited mJ sub-levels.
The bis(μ-phenoxo) Fe(III)Ni(II) compound [Fe(III)(N3)2LNi(II)(H2O)(CH3CN)](ClO4) (1) and the bis(μ-phenoxo)-μ-acetate/bis(μ-phenoxo)-bis(μ-acetate) {[Fe(III)(OAc)LNi(II)(H2O)(μ-OAc)](0.6)·[Fe(III)LNi(II)(μ-OAc)2](0.4)}(ClO4)·1.1H2O (2) have been synthesized from Robson type tetraiminodiphenol macrocyclic ligand H2L, which is [2 + 2] condensation product of 4-methyl-2,6-diformylphenol 2,2'-dimethyl-1,3-diaminopropane. Single-crystal X-ray structures both compounds determined. cationic part...
The 2,2′:6′:2″-terpyridine ligand has literally shaped the coordination chemistry of transition metal complexes in a plethora fields. Expansion bite by amine functionalities between pyridine units tridentate N,N’-dimethyl-N,N’-dipyridine-2-yl-pyridine-2,6-diamine (ddpd) modifies properties corresponding complexes, comprising redox chemistry, molecular dynamics, magnetism and luminescence. origins these differences ddpd tpy will be elucidated comprehensively summarized with respect to first...
Three new tetranuclear iron(III) and zinc(II) complexes, [Fe4(cpdp)2(phth)2(OH)2]·8H2O (1), [Fe4(cpdp)2(terephth)2(OH)2] (2), [Zn4(Hcpdp)2(suc)]Br2·12H2O (3), have been synthesized as models for the active site of phosphoester hydrolases by utilizing a polydentate ligand, N,N′-bis[2-carboxybenzomethyl]-N,N′-bis[2-pyridylmethyl]-1,3-diaminopropan-2-ol (H3cpdp) in combination with exogeneous phthalate (phth), terephthalate (terephth), succinate (suc). Single crystal X-ray analyses reveal that...
Abstract Iron is an essential co‐factor for cellular processes. In the immune system, it can activate macrophages and represents a potential therapeutic various diseases. To specifically deliver iron to macrophages, oxide nanoparticles are embedded in polymeric micelles of reactive polysarcosine ‐block‐ poly( S ‐ethylsulfonyl‐ l ‐cysteine). Upon surface functionalization via dihydrolipoic acid, cores act as crosslinker themselves undergo chemoselective disulfide bond formation with...
Meta–meta metalation: Remarkably, toluene can be directly dimanganated or dimagnesiated at the 3,5-positions using bimetallic bases with active Me3SiCH2 ligands (see scheme, blue). In contrast, n-butyl lead to 2,5-metalation (red). tmp=2,2,6,6-tetramethylpiperidide. Organolithium reagents have long enjoyed iconic status amongst synthetic chemists, in part because of their unrivaled ability affect directed metalation (lithiation, lithium–hydrogen exchange) reactions on arenes, heteroarenes,...
Inside out approach: Twofold deprotonation of benzene by a sodium monoalkyl bisamido manganate(II) reagent derived from BuNa, 2,2,6,6-tetramethylpiperidine, and Mn(CH2SiMe3)2 has produced the first inverse-crown complex in which transition-metal atoms are incorporated host (see X-ray structure, blue N, green Na, purple Mn). Variable-temperature magnetization measurements show that is antiferromagnetic.
The chromium(III) complex [Cr
A novel family of homodinuclear complexes the general formula [Ln(2)L(2)(X)(2)] (where Ln = Nd(3+), Pr(3+), Sm(3+) and Tb(3+) for 1, 2, 3 4, respectively X, coordinated NO(3)(-) or Cl(-) anion) has been synthesised from corresponding lanthanide(III) salts with pentadentate dianionic Schiff base ligand, H(2)L [N(1),N(3)-bis(salicylideneimino)diethylenetriamine], that exhibits a N(3)O(2) donor set. Single crystal X-ray diffraction studies evidenced isostructurality this centrosymmetric neutral...
With the aim of introducing diisopropylamide [NiPr(2)](-) ligand to alkali-metal-mediated manganation (AMMMn) chemistry, temperature-dependent reactions a 1:1:3 mixture butylsodium, bis(trimethylsilylmethyl)manganese(II), and diisopropylamine with ferrocene in hexane/toluene have been investigated. Performed at reflux temperature, reaction affords surprising, ferrocene-free, hydrido product [Na(2)Mn(2) (mu-H)(2){N(iPr)(2)}(4)]2 toluene (1), first Mn inverse crown complex. Repeating...
Abstract Reaction of a Schiff base ligand derived from salicyloyl hydrazide and diacetyl monooxime (H 2 L) with triangular μ 3 ‐oxido‐centered [Fe (μ ‐O)] 7+ core yields new tetranuclear iron(III) complex. Fe III 4 ‐O) crystallizes in the triclinic space group P $\bar {1}$ . Structural studies reveal that this complex is structure type an uncharged (alkoxido)(oxido)iron(III) cluster which four ions are located at corners distorted tetrahedron. A study magnetic properties supports presence...
We report a family of butterfly-like [CoIII2LnIII2] complexes with Ln = Gd, Tb, Dy, Ho, Er and Yb. All them are isostructural but the complex Gd strings in one dimensional chain. The Dy member shows slow relaxation magnetization under zero DC applied field, while all others only after small field is applied.
Abstract Photoactive metal complexes employing Earth‐abundant ions are a key to sustainable photophysical and photochemical applications. We exploit the effects of an inversion center ligand non‐innocence tune luminescence photochemistry excited state [CrN 6 ] chromophore [Cr(tpe) 2 3+ with close octahedral symmetry (tpe=1,1,1‐tris(pyrid‐2‐yl)ethane). exhibits longest lifetime ( τ =4500 μs) reported up date for molecular polypyridyl chromium(III) complex together very high quantum yield Φ...
Molecular materials that exhibit stimuli-responsive bistability are promising candidates for the development of molecular switches and sensors. We herein report on coexistence a wide thermal hysteretic spin crossover (SCO) effect thermally inducible metastable high-spin state at low temperatures achieved with two new complexes [FeII(Lnpdtz)2(NCX)2] (X = S; Se), Lnpdtz being (2-naphthyl-5-pyridyl-1,2,4-thiadiazole) X S (1) Se (2). Pronounced π-π-stacking aromatic side residues ligands enables...
In order to expand and exploit the useful properties of d6-iron(II) d5-iron(III) complexes in potential magnetic, photophysical, or magnetooptical applications, crucial ligand-controlled parameters are ligand field strength a given coordination mode availability suitable metal frontier orbitals for charge-transfer processes. The push-pull 2,6-diguanidylpyridine (dgpy) features low-energy π* at pyridine site strongly electron-donating guanidinyl donors combined with ability form six-membered...