Twenty-Eighth Rochester Mineralogical Symposium

Rare Self-Luminous Mixed-Valence Eu-MOF with a Self-Enhanced Characteristic as a Near-Infrared Fluorescent ECL Probe for Nondestructive Immunodetection

“…From Figure A, we can see that well crystallinity exists in the as-synthesized L 4 Eu III 2 Eu II and forceful peaks matched with the simulated spectrogram (CCDC-1002845) faultlessly, which were shown at 6.34, 6.96, 7.24, 8.76, 13.92, 14.52, and 23.54° primarily, corresponding to crystallographic planes of (010), (011), (011̅), (012), (202), (022̅), and (242). Second, Fourier transform infrared (FT-IR) measurement was used to testify functional groups in L 4 Eu III 2 Eu II for further combining its structure, in which the peaks at 700–1620 and 2915–2954 cm –1 corresponded to quinoline aminoaryl and tertiary butyl, respectively. To be specific, the bands at 2915–2954 cm –1 were ascribed to −CH 3 (asymmetric stretching vibration), a number of bands at 1615, 1508, 1469, 1386, 1360, 1255, 1160, 1087, 825 and 794 cm –1 were ascribed to the quinoline ring, and the strong peak at 1590 cm –1 was ascribed to the CN group; moreover, peaks at 1246 and 3440 cm –1 were identified as phenolic C–O and O–H stretching vibrations (Figure B). , After coordinating with Eu 2+/3+ , the spectrum was red-shifted and the intensity had increased, which explained the success of coordination and the strengthening of the delocalized conjugate system after coordination.…”

“…Second, Fourier transform infrared (FT-IR) measurement was used to testify functional groups in L 4 Eu III 2 Eu II for further combining its structure, in which the peaks at 700–1620 and 2915–2954 cm –1 corresponded to quinoline aminoaryl and tertiary butyl, respectively. To be specific, the bands at 2915–2954 cm –1 were ascribed to −CH 3 (asymmetric stretching vibration), a number of bands at 1615, 1508, 1469, 1386, 1360, 1255, 1160, 1087, 825 and 794 cm –1 were ascribed to the quinoline ring, and the strong peak at 1590 cm –1 was ascribed to the CN group; moreover, peaks at 1246 and 3440 cm –1 were identified as phenolic C–O and O–H stretching vibrations (Figure B). , After coordinating with Eu 2+/3+ , the spectrum was red-shifted and the intensity had increased, which explained the success of coordination and the strengthening of the delocalized conjugate system after coordination. To better attest the mixed valence of L 4 Eu III 2 Eu II , a compositional study was performed by using X-ray photoelectron spectroscopy (XPS).…”