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Emission spectra of [Eu(S-RRRR-1)(H2O)]− (top), [Eu(dota)(H2O)]− (above, middle), [Eu(S-SSSS-1)(H2O)]− (below, middle) and [Eu(dtpa)(H2O)]2− (bottom). Peaks characteristic of one coordination isomer in the spectrum of [Eu(dota)(H2O)]− are indicated with arrows; dashed arrows indicate the SAP isomer, whereas solid arrows indicate the TSAP isomer.
