A5042696961- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metal complexes synthesis and properties
- Metal-Catalyzed Oxygenation Mechanisms
- Magnetism in coordination complexes
- Neurobiology and Insect Physiology Research
- Organometallic Complex Synthesis and Catalysis
- Amphibian and Reptile Biology
- Metalloenzymes and iron-sulfur proteins
- CO2 Reduction Techniques and Catalysts
- Crystallography and molecular interactions
- melanin and skin pigmentation
- X-ray Spectroscopy and Fluorescence Analysis
- Photochemistry and Electron Transfer Studies
- Chemical Reaction Mechanisms
- Animal Behavior and Reproduction
- Organic Light-Emitting Diodes Research
- Turtle Biology and Conservation
- Hemoglobinopathies and Related Disorders
- Ichthyology and Marine Biology
- Advanced Chemical Physics Studies
- Pneumocystis jirovecii pneumonia detection and treatment
- ATP Synthase and ATPases Research
- Advanced X-ray Imaging Techniques
- Connexins and lens biology
Lund University
2011-2025
Stockholm University
2014
NOAA Chemical Sciences Laboratory
2009
Combined X-ray free-electron laser techniques pinpoints loci of intersections between potential energy surfaces a photo-excited 3d transition-metal centered molecule.
Highlights•The first in-depth study of plesiosaur soft tissues is reported•Some plesiosaurs had smooth skin on the body and small scales flippers•Scales likely enhanced swimming and/or grip substrate during feedingSummaryPlesiosaurs are an iconic group Mesozoic marine reptiles with evolutionary history spanning over 140 million years (Ma).1 Their skeletal remains have been discovered worldwide; however, accompanying fossilized exceptionally rare.2 Here, we report a virtually complete from...
A (PCP)PdMe complex has been synthesized and structurally characterized, displaying a very long Pd−Me bond. It is reactive toward CO2 insertion, giving the corresponding acetate in quantitative yield. The methyl can be regenerated using ZnMe2, catalytic carboxylation possible benzene.
To model the heterodinuclear active sites in plant purple acid phosphatases, a mononuclear synthon, [Fe(III)(H(2)IPCPMP)(Cl(2))][PF(6)] (1), has been generated situ from ligand 2-(N-isopropyl-N-((2-pyridyl)methyl)aminomethyl)-6-(N-(carboxylmethyl)-N-((2-pyridyl)methyl)amino methyl)-4-methylphenol (IPCPMP) and used to synthesize complexes of formulas [Fe(III)M(II)(IPCPMP)(OAc)(2)(CH(3)OH)][PF(6)] (M = Zn (2), Co (3), Ni (4), Mn (5)), [Fe(III)Zn(II)(IPCPMP)(mpdp)][PF(6)] (6) (mpdp...
The unsymmetrical dinucleating ligand 2-(N-isopropyl-N-((2-pyridyl)methyl)aminomethyl)-6-(N-(carboxylmethyl)-N-((2-pyridyl)methyl)aminomethyl)-4-methylphenol (IPCPMP or L) has been synthesized to model the active site environment of dinuclear metallohydrolases. It isolated as hexafluorophosphate salt H4IPCPMP(PF6)2·2H2O (H4L), which structurally characterized, and used form two different Zn(II) complexes, [{Zn2(IPCPMP)(OAc)}2][PF6]2 (2) [{Zn2(IPCPMP)(Piv)}2][PF6]2 (3) (OAc = acetate; Piv...
Dinuclear carboxylate-bridged zinc complexes of one symmetric and asymmetric phenolate-based ligand catalyse the transesterification 2-hydroxypropyl-p-nitrophenyl phosphate (HPNP) at different rates, with an unsymmetrical complex being more active than a one.
Abstract The heterodinuclear mixed‐valence complex [FeMn(ICIMP)(OAc) 2 Cl] ( 1 ) {H ICIMP = 2‐( N ‐carboxylmethyl)‐[ ‐( ‐methylimidazolyl‐2‐methyl)aminomethyl]‐[6‐( ‐isopropylmethyl)‐[ ‐methylimidazolyl‐2‐methyl)]aminomethyl‐4‐methylphenol], an unsymmetrical 4 O donor ligand} has been synthesized and fully characterized by several spectroscopic techniques as well X‐ray crystallography. crystal structure of the reveals that both metal centers in are six‐coordinate with chloride ion occupying...
The concept of coordination sphere (CS) is central to the rational development hierarchical molecular assemblies in modern chemistry. Manipulating organization around transition metal ions with covalent and supramolecular interactions a general strategy that underlies most synthetic protocols. Achieving similar control for photoexcited complexes necessary advance design light-driven functionalities. This objective calls monitoring ultrafast dynamics primary (1-CS) secondary (2-CS) spheres on...
Ultrafast excited state dynamics of [Cr(CO)<sub>4</sub>(bpy)] upon metal-to-ligand charge-transfer (<sup>1</sup>MLCT) transition have been studied by pump-probe absorption spectroscopy and DFT calculation.
Oligonuclear complexes of d4–d7 transition metal ion centers that undergo spin-switching have long been developed for their practical role in molecular electronics. Recently, they also appeared as promising photochemical reactants demonstrating improved stability. However, the lack knowledge about photophysical properties solution phase compared to mononuclear is currently hampering inclusion into advanced light-driven reactions. In present study, ultrafast photoinduced dynamics a solvated...
We synthesized a new homoleptic, tris-bidentate complex [Ru(QPzH)3](2+) based on the novel biheteroaromatic, 8-(3-pyrazolyl)-quinoline ligand QPzH. The QPzH was designed to reduce distortions typically observed in complexes incorporating 8-quinolinyl group into framework. This indeed observed, and also, as anticipated, found facilitate formation of tris-homoleptic Ru(II) complexes; is first reported with ligands group. synthesis can either result statistical 3:1 mer/fac ratio complex, or,...
An atomistic understanding of the photoinduced spin-state switching (PSS) within polynuclear systems d4–d7 transition metal ion complexes is required for their rational integration into light-driven reactions chemical and biological interest. However, in contrast to mononuclear systems, multidimensional dynamics PSS solvated molecular arrays have not yet been elucidated due expected complications associated with connectivity between centers strong interactions surroundings. In this work, a...
Melanin pigments play a critical role in physiological processes and shaping animal behaviour. Fossil melanin is unique resource for understanding the functional evolution of but impact fossilisation on molecular signatures eumelanin and, especially, phaeomelanin not fully understood. Here we present model chemical taphonomy fossil based thermal maturation experiments using feathers from extant birds. Our results reveal which are authentic signals thermally matured phaeomelanin, artefacts...
Reaction of the ligand 2-(N-isopropyl-N-{(2-pyridyl)methyl}aminomethyl)-6-(N-(carboxymethyl)-N-((2-pyridyl)-methyl)amino-methyl)-4-methylphenol (H2IPCPMP) with two equivalents Fe(ClO4)2 and sodium pivalate in air leads to formation μ-oxido, μ-carboxylato-bridged diiron complex [{Fe(H-IPCPMP)}2(μ-O)(Piv)]ClO4 (1) (Piv = pivalate). Complex 1 is capable catalysing oxidation cyclohexane or 1,2-cis-dimethylcyclohexane by hydrogen peroxide, leading corresponding cyclohexanone cyclohexanol, as well...
Residual melanins have been detected in multimillion-year-old animal body fossils; however, confident identification and characterization of these natural pigments remain challenging due to loss chemical signatures during diagenesis. Here, we simulate this post-burial process through artificial maturation experiments using three synthetic one eumelanin exposed mild (100 °C/100 bar) harsh (250 °C/200 environmental conditions, followed by analysis employing alkaline hydrogen peroxide oxidation...
The unsymmetrical nature of a new tridentate ligand bis(quinolinyl)-1,3-pyrazole (DQPz) is exploited in bistridentate Ru(II) complex [Ru(DQPz)2]2+ to elucidate an unexpected dynamic diastereomerism. Structural characterization based on combination nuclear magnetic resonance spectroscopy and density functional theory calculations reveals the first quantifiable diastereomerization dynamics for Ru complexes with fully conjugated heteroaromatic ligands. A mechanism that involves large-scale...
Three homoleptic ruthenium(II) complexes, [Ru(Q3PzH)3]2+, [Ru(Q1Pz)3]2+, and [Ru(DQPz)2]2+, based on the quinoline-pyrazole ligands, Q3PzH (8-(3-pyrazole)-quinoline), Q1Pz (8-(1-pyrazole)-quinoline), DQPz (bis(quinolinyl)-1,3-pyrazole), have been spectroscopically theoretically investigated. Spectral component analysis, transient absorption spectroscopy, density functional theory calculations, ligand exchange reactions with different chlorination agents reveal that excited state dynamics for...
A series of homoleptic Ru(II) complexes including the tris-bidentate a new bidentate ligand 8-(1-pyrazol)-quinoline (Q1Pz) and 8-(3-pyrazol)-quinoline (Q3PzH), as well bis-tridentate complex bis(quinolinyl)-1,3-pyrazole (DQPz) was studied. Together these explore orientation pyrazole relative to quinoline. By examining structurally, photophysically, photochemically, electrochemically, computationally by DFT TD-DFT, it is shown that has significant influence on key properties. In particular,...
The transition from terrestrial to marine environments by secondarily aquatic tetrapods necessitates a suite of adaptive changes associated with life in the sea, e.g., scaleless skin adult individuals extant leatherback turtle. A partial, yet exceptionally preserved hard-shelled (Pan-Cheloniidae) sea turtle extensive soft-tissue remains, including epidermal scutes and virtually complete flipper outline, was recently recovered Eocene Fur Formation Denmark. Examination fossilized limb tissue...