Download Luminescence of Lanthanide Ions in Coordination Compounds by Ana de Bettencourt-Dias PDF

By Ana de Bettencourt-Dias

This entire booklet provides the theoretical rules, present purposes and most modern study advancements within the box of luminescent lanthanide complexes; a swiftly constructing sector of study that's attracting expanding curiosity among the clinical community.

Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials starts with an creation to the elemental theoretical and useful facets of lanthanide ion luminescence, and the spectroscopic options used to guage the potency of luminescence. next chapters introduce a number of varied functions including:

• Circularly polarized luminescence
• Luminescence bioimaging with lanthanide complexes
• Two-photon absorption of lanthanide complexes
• Chemosensors
• Upconversion luminescence
• Excitation spectroscopy
• Heterometallic complexes containing lanthanides

Each bankruptcy provides an in depth creation to the appliance, by means of an outline of experimental suggestions particular to the world and an intensive overview of modern literature.

This ebook is a beneficial advent to the literature for scientists new to the sphere, in addition to delivering the more matured researcher with a entire source overlaying the main suitable info within the box; a ‘one cease store’ for all key references.

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Additional resources for Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials

Example text

The symmetry around the metal ion is C4v with CN 9, with a C4 axis passing through the metal ion and the capping point charge.  2 à r  ˆ Ze 12cos2 θ 11 3 R  4 à r  B40 ˆ Ze2 5 35cos4 θ 30cos2 θ ‡ 4 R  6 ! r 1 1 ‡ …231cos6 θ 315cos4 θ ‡ 105cos2 θ† B60 ˆ Ze2 7 2 2 R B20 2 The crystal field parameters B44 and B64 , which account for the distortions from C4v symmetry, are analogous to the square antiprismatic case. 8 Other Methods to Estimate Crystal Field Parameters The point-charge electrostatic model is useful in illustrating how symmetry influences the signs of the crystal field parameters Bkq .

Work done by Latva et al. [68] indicates that the position of the lowest triplet state relative to the emissive state of the Ln(III) ion is important for the efficiency of the energy transfer. From their survey of 41 different ligands, these authors conclude that for Eu(III) good energy transfer happens if the triplet to f* gap is in the range 2500–4000 cm 1, with emission efficiencies in the range 15–38%. Nonetheless, an emission efficiency of 12% was observed for a complex with ΔE ≈ 9000 cm 1, and an emission efficiency of 11% was observed for another complex with ΔE ≈ 1000 cm 1.

However, in the case of lanthanide ions such as europium and ytterbium, which are easily reduced, electron transfer and phonon-assisted mechanisms have been invoked [73,74]. Förster or Dipole–Dipole Energy Transfer For systems in which molecules are present that are capable of absorbing and emitting energy and energy transfer is observed between donors and acceptors, Förster postulated that the decrease in excitation of the donor occurs in parallel with the increase in emission of the acceptor, which is consistent with a dipole– dipole exchange mechanism.

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