Lanthanide absorption spectra

Pigments, minerals, gemstones, glasses, and many related materials are colored by impurity defects that absorb some of the incident white light, leaving a depleted spec-hum to color the solid. Colors in these materials are thus characterized by the absorption spectrum of the solid. Common inorganic colorants are the transition-metal and lanthanide metal ions. The colors ate characteristic of the ions themselves and are due... 

Addition of lanthanide ions to dendrimer solutions showed that (a) the absorption spectrum of the dendrimer is almost unaffected, (b) the fluorescence of the dansyl units is quenched (c) the quenching effect is very large for Nd3+ (Fig. 7) and Eu3+, moderate for Er3+ and Yb3+, small for Tb3+, and very small for Gd3+ (d) in the case of Nd3+ (Fig. 7), Er3+, and Yb3+ quenching of the dansyl fluorescence is accompanied by the sensitized near-infrared emission of the lanthanide ion [42]. 

For our purposes, it is interesting to note that the perovskite ErAlo.9Cro.1O3 emits the continuous spectrum of Cr(III) without the red and green Er(III) bands in spite of the fact that the aqueous solution has e of erbium(III) at 5230 A equal to 3.2 to be compared with a-tenth of e, 1.3 of chromium(III) at 5750 A. The absorption spectrum of the nitrate solution is even more striking in a spectroscope, because the transitions of Er(III) are so much narrower. Quite generally, Cr(III) seems to be very effective to prevent narrow band luminescence of the lanthanides. 

Akiyama et al. (2001) s)mthesized and isolated some light actinide metallofullerenes such as U C82, Np Cg2/ and Am C82 and foimd the valency of U atom in C82 cage is 3-I-, showing almost exactly the same UV-Vis-NIR absorption spectrum as that of the bivalent lanthanide C82 metallofullerenes such as La Cs2 and Gd C82-... 

Am. Oiem. Soc- 36, 2060 (1914) by ion exchange Speddtng et al, ibid. 76, 2557 (1954). Prepn of metal by electrodeposition eidem, J. Electrochem. Soc. 100,442 (1953). Absorption spectrum Urbain, foe, cit. Reviews of prepn, proparties and compds of terbium and other lanthanides The Rare... 

The absorption spectrum of the acceptor is shown in the bottom panel of Figure 15.19. A favorable aspect of retinal is that it can be photobkached. thus decreasing the acceptor concentration in the disk membranes. Rrior to pho-tobleaching, the absorption spectrum of retirtal overlaps with that of the Tb donor. The emission spectrum of terbium is typical of the lanthanides. The emission is from /orbitals of the atom, and the emission spectra are typically highly structured line spectra. Also, it is cormnon to use lanthanide chelates, rather than lanthanides alone. This is because the lanthanides are extremely weak absorbers, with extinction coefricients near 0.1 cm. Fortu-... 

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