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[交流] 【求助】求助紫外光谱

小弟光谱分析没学好。。文献看不懂。。

向各位大哥大姐求教这图啥意思。。
The absorption spectra of 1, CR1, [Eu(tta)3], and acidified
N-(Rhodamine-6G)lactamethylenediamine are shown in
Figure 2. Free CR1 displays an intensive absorption band in
the visible region centered at 415 nm that arises from the
coumarin chromophore (Supporting Information Figure S5.1)
and a weak band at about 302 nm, which is attributed to
absorption of the ring-closed tautomeric form of the Rhodamine
6G moiety (Supporting Information Figure S5.2). The
UV/Vis absorption spectrum of 1 displays three main
absorption bands centered at 345, 415, and 525 nm. By
comparison of the absorption spectra of [Eu(tta)3], CR1, and
1, the first two were mainly assigned to the characteristic
absorption maxima of the Eu-TTA moiety and the coumarin
chromophore, respectively. The last band, which is absent in
CR1, should be assigned to the absorption of the ring-opened
tautomer of the Rhodamine 6G chromophore,[14] that is, the
carbonyl group of the Rhodamine 6G moiety is coordinated
to the Eu center and the attached spiro ring has opened to
make green emission of 1 possible.
Thus, 1 exhibits characteristic blue emission of the
coumarin fluorophore centered at 460 nm, green Rhodamine
emission centered at 550 nm, and typical red emission of the
EuIII ion with dominant peak at 612 nm when its solution in
acetonitrile (50 mm) is excited at 415, 525, and 360 nm,
respectively (Figure 3). The quantum yields of the blue,
green, and red emissions are about 0.056, 0.085 and 0.005,
respectively.[15] While a few organic dyes have been reported
that exhibit tunable emissive properties,[8a] the generation of
pure blue, green, and red emissions in a single-component dye
by simply changing the excitation wavelengths is extremely
appealing and significant. Such color-tunable materials may
be promising candidates for emitting “pure” white light by
controllably tailoring blue, green, and red primary colors that
fully span the entire visible spectrum.

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