Controlled assembly of heterometallic lanthanide(III) macrocycles: incorporation of photoactive and highly paramagnetic metal centres within a single complex

Lewis, David J.; Moretta, Federica; Pikramenou, Zoe

doi:10.1080/10610278.2011.632823

Cited by 7 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of Gd 3+ as a heavy atom on the luminescence properties of Eu 3+ can efficiently enhance the luminescence of Eu 3+ ions, so the intensity of characteristic Eu 3+ emission is largely increased. 2,15,16…”

Section: Uv and Fluorescencementioning

confidence: 99%

“…In the past few years, dual modality imaging probes within a single molecule have been attracting increasing attention in the field of molecular imaging since they offer synergistic advantages over any single output. 1,2 Among the commonly used molecular bioimaging modalities, some are characterized by superb spatial resolution but low sensitivity and require a high concentration of the contrast agent to be detected, for instance magnetic resonance imaging (MRI). Others give high sensitivity and high contrast images but with low resolution such as fluorescence imaging.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel lanthanide–polymer complexes for dye-free dual modal probes for MRI and fluorescence imaging

et al. 2015

View full text Add to dashboard Cite

show abstract

Section: Uv and Fluorescencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel lanthanide–polymer complexes for dye-free dual modal probes for MRI and fluorescence imaging

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Conversely, the accessibility of covalent heteropolymetallic trivalent lanthanide complexes is challenging due to the comparable chemical properties and hence reactivity across the period, distinguishable only in their ionic radii with minute change in preferred coordination numbers and geometries. Despite this, heteropolymetallic architectures have been prepared via statistical approaches, , by thermodynamic control of the coordination at specific sites , or by refined approaches including postsynthetic modification strategies, − orthogonal ligand deprotection, or through careful ligand design, which can resolve these minor differences. − …”

Section: Introductionmentioning

confidence: 99%

Formation of Heteropolynuclear Lanthanide Complexes Using Macrocyclic Phosphonated Cyclam-Based Ligands

et al. 2020

View full text Add to dashboard Cite

Ligands L1 and L2, respectively based on a cyclam and a cross-bridged cyclam scaffold functionalised at N1 and N8 by 6-phosphonic-2-methylene pyridyl groups are described. While 2 complexation of lanthanide (Ln) cations with L2 was not possible, a family of complexes has been prepared with L1, of the general formulae [LnL1D2]Cl (Ln 3+ = Lu, Tb, Yb) or [LnL1D] (Ln 3+ = Eu). The solution, structural, potentiometric and photophysical data for these novel ligands and their complexes have been investigated, including solid-state study by X-ray diffraction (L1, L2 and [EuL1H]), 1 H NMR complexation investigations (Lu 3+) as well as UV-Vis absorption and luminescence spectroscopy in water and D2O (pH ≈ 7). L1 forms 1:1 metal-ligand stoichiometric octadentate complexes in solution. Importantly the pyridyl phosphonate functions are capable of simultaneous chelation to the metal centre and of interaction with a second metal centre. 1 H NMR (Lu 3+) and spectrophotometric titrations of the isolated [TbL1]complex by EuCl3 salts demonstrated the formation of high order (hetero)polymetallic species in aqueous solution (H2O, pH = 7). Global analysis of the luminescence titration experiment points to the formation of 4:1, 3:1, and 3:2 [TbL1]:Eu heteropolynuclear assemblies, exhibiting a strong preference to forming [TbL1]3Eu2 at increased europium concentrations, with energy transfer occurring between the kinetically inert terbium complex and added europium cations.

show abstract

“…New approaches have studied the preparation and photo‐luminescence behavior of heterometallic Ln III centers in a single molecule ,. For instance, Lewis et al reported the synthesis of heterometallic Ln III macrocycles and studied their dual luminescence properties in the visible and near IR region . Chen et al prepared highly luminescent Ln III ‐terpyridyl polymer that emists white‐light by tuning the stoichiometry of the lanthanide ion .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure and tuneable white-light emission of dinuclear Eu(III),Tb(III)-mixed Schiff base complexes

et al. 2016

View full text Add to dashboard Cite

A new family of lanthanide-Schiff base complexes have been synthesized and fully characterized from the novel Schiff base ligand: H 2 L 1 (acetic acid 2-hydroxy-benzylidene-hydrazide). The single crystal X-ray structure and mass spectroscopy reveal the isostructural dinuclear complexes: [Ln 2 L 1 (HL 1 ) 3 (NO 3 )] where Ln = Sm, Eu, Gd and Tb. Upon excitation of the Ln III complexes in solution, their luminescence spectra display the broad ligand centred (LC) band at~470 nm as well as the narrow f-f transitions. In Eu III complex, the LC emission is efficiently quenched, because of the better triplet state energy match to the Eu III -5 D 4 excited states. Doping methods of Eu III with Tb III into the complexes: [Eu x Tb 1-x (L 1 )(HL 1 ) 3 (NO 3 )], x = 0.5 (A), 1.0 (B) and 1.5 (C); in MeOH/DCM (1:10), have revealed variable colours. By careful control of the amounts of Eu III and Tb III in the dinuclear mixed EuTb-complexes, white-light emission is obtained from blue LC band, green Tb III luminescence and red Eu III luminescence. Such behaviour is attributed to the efficient sensitization of Eu III by the ligand and the metal to metal energy transfer from Tb III to Eu III excited 4f states.

show abstract

Controlled assembly of heterometallic lanthanide(III) macrocycles: incorporation of photoactive and highly paramagnetic metal centres within a single complex

Cited by 7 publications

References 29 publications

Novel lanthanide–polymer complexes for dye-free dual modal probes for MRI and fluorescence imaging

Novel lanthanide–polymer complexes for dye-free dual modal probes for MRI and fluorescence imaging

Formation of Heteropolynuclear Lanthanide Complexes Using Macrocyclic Phosphonated Cyclam-Based Ligands

Synthesis, structure and tuneable white-light emission of dinuclear Eu(III),Tb(III)-mixed Schiff base complexes

Contact Info

Product

Resources

About