A5073420294- Magnetism in coordination complexes
- Metal complexes synthesis and properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Lanthanide and Transition Metal Complexes
- Metal-Catalyzed Oxygenation Mechanisms
- Photochemistry and Electron Transfer Studies
- Free Radicals and Antioxidants
- Molecular Sensors and Ion Detection
- Crystallography and molecular interactions
- Crystal structures of chemical compounds
- Chromium effects and bioremediation
- Nanocluster Synthesis and Applications
- Electron Spin Resonance Studies
- Quantum Dots Synthesis And Properties
- Chemical Synthesis and Analysis
- Metal-Organic Frameworks: Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- Vanadium and Halogenation Chemistry
- Porphyrin and Phthalocyanine Chemistry
- Radioactive element chemistry and processing
- Synthesis and Characterization of Heterocyclic Compounds
- Supramolecular Chemistry and Complexes
- Structural and Chemical Analysis of Organic and Inorganic Compounds
- Chemical Reaction Mechanisms
University of Copenhagen
2008-2020
University of California, Santa Barbara
2008
University of Wrocław
2004-2005
San Jose State University
2005
University of Minnesota, Duluth
2005
University of Southern Denmark
2004
Abstract An overview of recent work dealing with luminescence properties in solution complexes the lanthanide(3+) ions Nd 3+ , Eu Tb Er and Yb which an organic chromophore is attached to metal centre as a sensitizer given. The various factors that influence metal‐centred lifetime intensity are discussed illustrated own results literature examples. VIS emitting require sensitizers absorb light UV or near range whereas absorbing can be used for NIR . latter type currently great interest...
A simple synthetic route to the preparation of a thin ZnS shell on CdSe quantum dot cores from air-stable, single-molecular precursor zinc diethyldithiocarbamate, Zn(S(2)CNEt(2))(2), in three-component solvent system octadec-1-ene/oleylamine/tri-n-octylphosphine (ODE/OLA/TOP) is presented. The one-pot synthesis proceeds through heating solution and amount crystalline Zn(S(2)CNEt(2))(2) corresponding thickness two monolayers 110-120 °C for 1-2 h. role surfactants OLA TOP significance...
The photoinduced low-spin (S = 0) to high-spin 2) transition of the iron(II) spin-crossover systems [Fe(btpa)](PF6)2 and [Fe(b(bdpa))](PF6)2 in solution have been studied for first time by means ultrafast transient infrared spectroscopy at room temperature. Negative positive difference bands between 1000 1065 cm−1 that appear within instrumental system response 350 fs after excitation 387 nm display formation vibrationally unrelaxed hot 5T2 state. Vibrational relaxation is observed...
The spin-crossover system [Fe(btpa)](PF(6))(2) (btpa = N,N,N',N'-tetrakis(2-pyridylmethyl)-6,6'-bis(aminomethyl)-2,2'-bipyridine) and the predominantly low-spin species [Fe(b(bdpa))](PF(6))(2) ((b(bdpa) N,N'-bis(benzyl)-N,N'-bis(2-pyridylmethyl)-6,6'-bis(aminomethyl)-2,2'-bipyridine) have been characterized by means of X-ray diffraction. unit cell contains two crystallographically independent molecules revealing octahedral quasi-seven-coordinated high-spin structures. one which corresponds...
Lanthanide-modified CdSe quantum dots (CdSe(Ln) QDs) have been prepared by heating a solution of Cd(oleate)2, SeO2, and Ln(bipy)(S2CNEt2)3 (bipy = 2,2′-bipyridine) to 180–190 °C for 10–15 min. The elemental compositions the resulting CdSe(Ln) cores CdSe(Ln)/ZnS core/shell QDs show this route be highly reproducible. optical absorption spectra these composite materials are similar those unmodified nanocrystals, but QD-centered band edge photoluminescence (PL) is partially quenched. time-gated...
Magnetochiral Dichroism of chiral mononuclear lanthanoid complexes is for the first time detected by X-ray absorption measurements on single crystals Holmium oxydiacetate, at Ho L<sub>3</sub>-edge. The effect opposite sign two enantiomers.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompetitive bimolecular electron- and energy-transfer quenching of the excited state(s) tetranuclear copper(I) cluster Cu4I4py4. Evidence for large reorganization energies in an excited-state electron transferAnders Dossing, Chong Kul Ryu, Setsuko Kudo, Peter C. FordCite this: J. Am. Chem. Soc. 1993, 115, 12, 5132–5137Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June...
The synthesis and X-ray structure of a new member the series oxo-bridged, dinuclear chromium(III) complexes, methyl isocyanide complex [(CH3NC)5CrOCr(CNCH3)5](PF6)4·2CH3CN, is reported. This constitutes only third with homoleptic auxillay ligand sphere. Experimentally, system shows unshifted narrow nuclear magnetic resonance (NMR) spectra that are consistent calculations using broken symmetry density functional theory (DFT), which suggests it to be strongest coupled, known. Furthermore, we...
The novel S = 1/2 thionitrosyl complexes Cr(NS)(CN)(5)(3-), Cr(NS)(dmso)(5)(2+), and Cr(NS)(nmf)(5)(2+) (dmso dimethyl sulfoxide, nmf N-methylformamide) have been prepared, their optical electron paramagnetic resonance (EPR) spectra were studied. values of the isotropic anisotropic hyperfine superhyperfine coupling constants A((53)Cr), A((14)N), A((13)C) g determined from EPR at room temperature 66 K. A(⊥) A(iso) in slightly higher than analogous nitrosyl complexes. A common feature...
Absorption, emission, and excitation spectra for solid-state solution of Tb(III), Dy(III), Gd(III) complexes with the polypyridine ligand 6,6'-bis[bis(2-pyridylmethyl)-aminomethyl]-2,2'-bipyridine (C36H34N8) are presented. Measurements excited-state lifetimes quantum yields in various solvents at room temperature 77 K also reported used to characterize energetics this system. Special attention is given characterization metal-to-ligand energy transfer efficiency mechanisms. The measurement...
Europium(III) and gadolinium(III) form 1 : complexes with the octadentate polypyridine ligand 6,6′-bis[bis(2-pyridylmethyl)aminomethyl]-2,2′-bipyridine L 2 . The crystal structure of complex [GdL Cl ]Cl·2H O·0.5EtOH has been determined. gadolinium atom is co-ordinated to seven nitrogen atoms two chloride ligands. One pyridine groups dangling unco-ordinated. Irradiation water or MeOH solutions [EuL ]Cl 3 UV light led a metal-centred luminescence. luminescence lifetimes at 296 K in water, D O,...
Photolysis of the thionitrosyl complex Cr(CH3CN)5(NS)2+ (1) in acetonitrile solution leads to dissociation nitrogen monosulfide (NS). In deaerated solution, this reaction is reversible, and flash photolysis studies demonstrate that NS reacts with Cr(CH3CN)62+ according rate law d[1]/dt = kon[Cr(CH3CN)62+][NS] (kon 2.3 × 108 M−1 s−1 at 298 K). The 1 added Fe(S2CNEt2)2 transfer formation a species concluded be Fe(S2CNEt2)2(NS) based on its electron paramagnetic resonance spectrum. Analogous...
The reaction of [Cr(NCCH(3))(6)](2+) with dioxygen in acetonitrile (MeCN) solution acidified HBF(4) gave red crystals the binuclear complex [(CH(3)CN)(5)Cr(OH)Cr(NCCH(3))(5)](BF(4))(5) (1). From X-ray crystal structure 1, Cr-O-Cr angle was found to be 147.5(2) degrees. Magnetic susceptibility measurements 1 showed an antiferromagnetic coupling between two chromium(III) centers a triplet energy J = 35.9(1) cm(-1). On redissolution MeCN, hydroxo bridge deprotonated, and green...
[(NH 3 ) Cr(OH) Cr(NH ] (ClO 4 3−x cristallise dans le systeme orthorhombique, groupe d'espace Pmn2 1 et sa structure est affinee jusqu'a R=0,040