98820-73-6Relevant articles and documents
Synthesis and linear and nonlinear optical properties of metal-terminated bis(dioxaborine) polymethines
Lin, Hsin-Chieh,Kim, Hyeongeu,Barlow, Stephen,Hales, Joel M.,Perry, Joseph W.,Marder, Seth R.
, p. 782 - 784 (2011)
RhIII and IrIII can be complexed to bipyridine groups attached to the termini of bis(dioxaborine)-capped heptamethines; these chromophores exhibit large third-order polarisabilities at 1.55 μm, while retaining good film-forming properties and linear optical transparency in the near infrared. The Royal Society of Chemistry 2011.
Optical and relaxometric properties of monometallic (EuIII, TbIII, GdIII) and heterobimetallic (ReI/GdIII) systems based on a functionalized bipyridine-containing acyclic ligand
Leygue, Nadine,Boulay, Alexandre,Galaup, Chantal,Benoist, Eric,Laurent, Sophie,Vander Elst, Luce,Mestre-Voegtlé, Béatrice,Picard, Claude
, p. 8379 - 8393 (2016)
A series of lanthanide complexes of [LnL(H2O)]2- composition where Ln = EuIII, TbIII or GdIII has been studied for determining their photophysical and relaxometric properties in aqueous solution. The bifunctional ligand L (H5BPMNTA) is an acyclic chelator based on a central functionalized 2,2′-bipyridine core and two iminodiacetate coordinating arms. The mono-aqua EuIII and TbIII complexes display attractive spectroscopic properties with an excitation wavelength at 316 nm, similar excited state lifetimes and overall quantum yields (in the ranges 0.5-0.6 ms and 10-13%, respectively) in Tris buffer (pH 7.4). The proton longitudinal relaxivity, r1, of the GdIII complex is 4.4 mM-1 s-1 at 20 MHz and 310 K, which is comparable to that of the clinically used Gd-DTPA (Magnevist). Interestingly, the water exchange rate between the coordination site and the bulk solvent is very fast (Kex = 2.6 × 108 s-1 at 310 K). The ability of the complex to bind non-covalently to human serum albumin (HSA) was also examined by relaxometric measurements. We also report the synthesis and properties of a bimetallic complex based on Gd-BPMNTA and ReI(bpy)(CO)3 components. In this system, the Re core exhibits interesting photophysical properties (λem = 588 nm, Φ = 1.4%) and the Gd-BPMNTA core displays improved relaxivity (r1 = 6.6 mM-1 s-1 at 20 MHz and 310 K), due to an increase of the rotational correlation time. Besides these appealing optical and relaxometric properties, the presence of a reactive function on the structure proposes this potential dual imaging probe for conjugation to biomolecules or nanomaterials.