A5053069962- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Organometallic Complex Synthesis and Catalysis
- Advanced NMR Techniques and Applications
- Crystallography and molecular interactions
- CO2 Sequestration and Geologic Interactions
- Calcium Carbonate Crystallization and Inhibition
- Metal-Organic Frameworks: Synthesis and Applications
- Minerals Flotation and Separation Techniques
- Electron Spin Resonance Studies
University of Sussex
2019-2025
University of Manchester
2019-2020
Brighton Hospital
2020
Bangor University
2018
Replacing a monoanionic cyclopentadienyl (Cp) ligand in dysprosium single-molecule magnets (SMMs) with dianionic cyclobutadienyl (Cb) the sandwich complexes [(η
Intact transfer of the cyclobutadienyl ligand [C4(SiMe3)4]2- to yttrium and dysprosium (M) produces half-sandwich complexes [M{η4-C4(SiMe3)4}(BH4)2(THF)]- as coordination polymers with bridging sodium or potassium ions. The versions are single-molecule magnets (SMMs) energy barriers 371(7) 357(4) cm-1, respectively. pristine ligands provide a strong axial crystal field that enhances SMM properties relative related cyclopentadienyl compounds.
The structure and magnetic properties of the bimetallic borohydride-bridged dysprosocenium compound [{(η5-Cpttt)(η5-CpMe4t)Dy}2(μ:κ2:κ2-BH4)]+[B(C6F5)4]− ([3Dy][B(C6F5)4]) are reported along with solution-phase dynamics isostructural yttrium lutetium analogues (Cpttt is 1,2,4-tri(tert-butyl)cyclopentadienyl, CpMe4t tetramethyl(tert-butyl)cyclopentadienyl). synthesis [3M][B(C6F5)4] was accomplished in 2:1 stoichiometric reactions [(η5-Cpttt)(η5-CpMe4t)Dy(BH4)] (2M) [CPh3][B(C6F5)4],...
Multimetallic half-sandwich complexes of the paramagnetic lanthanides gadolinium, terbium, dysprosium, holmium, and erbium as well diamagnetic yttrium are readily accessible via AlMe4/halogenido exchange reactions Cp*Ln(AlMe4)2 with mild halogenido transfer reagents Me3SiI Me3GeX (Cp* = C5Me5; X Br, Cl). Depending on rare-earth-metal center ion size, distinct structural motifs nuclearities obtained, including dimeric compounds [Cp*Ln(AlMe4)(μ2-Cl)]2 for smaller metal centers Ln Ho, Er,...
The sodium cyclobutadienyl (Cb) reagent [Na2{η4-C4(SiMe3)4}(THF)]2 (2) reacts with rare-earth halides [MCl3(THF)x], where M = Y, Dy (x 3.5) and Lu 3), giving the sandwich coordination polymers [M{η3-C4(SiMe3)4H}{η4-C4(SiMe3)3-κ-(CH2SiMe2}Na]∞ (3M, Dy, Lu). environments of metals in 3M feature an η4-cyclobutadienyl ligand, additional by a tuck-in trimethylsilyl group η3-cyclobutenyl ligand. ligand activation is thought to be consequence deprotonation Cb 2. axial nature crystal field reflected...
Abstract Replacing a monoanionic cyclopentadienyl (Cp) ligand in dysprosium single‐molecule magnets (SMMs) with dianionic cyclobutadienyl (Cb) the sandwich complexes [(η 4 ‐Cb′′′′)Dy(η 5 ‐C Me t Bu)(BH )] − ( 1 ), 8 ‐Pn † )K(THF)] 2 ) and 3 leads to larger energy barriers magnetization reversal (Cb′′′′=C (SiMe , Pn =1,4‐di(tri‐isopropylsilyl)pentalenyl). Short distances Cb′′′′ ligands longer Cp – are consistent crystal field splitting being dominated by former. Theoretical analysis shows...
Previous employment of the ligands 2-methoxy-6-[(methylimino)methyl]phenol (L1H) and 2-methoxy-6-[(phenylimino)methyl]phenol (L2H) has resulted in self-assembly pseudo metallocalix[6]arene complexes general formulae: [M7(μ3-OH)6(Lx)6](NO3)y (M = Ni(ii), x 1, y 2 (1) Co(ii/iii), 2, 3 (2)). Extrapolating upon this work, we report coordination chemistry 2-methoxy-6-{[(2-methoxyphenyl)imino]methyl}phenol (L3H), 2-[(benzylimino)methyl]-6-methoxyphenol (L4H),...