The Effect of Tb and Sm Ions on the Photochromic Behavior of Two Spiropyrans of Benzoxazine Series in Solution

<table>UV/vis absorption spectra of SP(I) and its complexes with Tb<sup>3+</sup> and Sm<sup>3+</sup> ions in DMF before and after light irradiation ([SP(I)] =
[Ln<sup>3+</sup>] =  60 <svg height="9.6750002" id="M30" style="vertical-align:-2.29482pt" version="1.1" viewbox="0 0 9.6374998 9.6750002" width="9.6374998" xmlns="http://www.w3.org/2000/svg">
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<tspan style="font-size: 12.50px; " x="0" y="0">𝜇</tspan>
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(at 295 ± 1K).</table>

Advances in Physical Chemistry

fig1

Figure 1

Figure 1: The Effect of Tb and Sm Ions on the Photochromic Behavior of Two Spiropyrans of Benzoxazine Series in Solution 