Iron (III)-Quercetin Complex: Synthesis, Physicochemical Characterization, and MRI Cell Tracking toward Potential Applications in Regenerative Medicine

Table 1

FTIR information regarding the detected characteristic bands [60–62] of quercetin, the deprotonated quercetin, and IronQ.

Group assigned to the given band	Wavenumber (cm^−1)
	Quercetin	Deprotonated quercetin (pH 12)	IronQ
O–H stretching vibration of phenol	3386, 3263	3352, 3172	3353, 3195
C=O aryl ketonic stretch	1664 s	1637 w, 1739 w (shoulders)	1617 w, 1682 w, 1731 w (shoulders)
C=C aromatic ring stretching bands	1604 s, 1560 s, 1516 s, 1448 s, 1407 s	1592 s, 1504 w, 1436 m	1569 s, 1479 s, 1414 s
O–H bending of phenols	1376 s	1364 w	1382 w
C–H bonds in aromatic hydrocarbon bending (in-plane)	1315 s, 1128 s, 1088 s, 1012 s, 932 s	1308 w (shoulder), 1108 m, 1060 m, 1019 m, 950 w	1337 w, 1121 w, 1085 s 1024 w, 976 m, 955 w,
C–O stretching of aryl ether (C–O–C)	1260 s	1272 s	1259 s
C–O stretching in phenol	1196 s	—	—
C–CO–C stretching and bending in ketones	1164 s	1168 s	1162 s
C–H bending of aromatic hydrocarbons (out-of-plane)	884 s, 864 s, 844 s, 820 s, 795/792 w, 720 s, 676, 632 s, 599 s	890w, 830/808 w, 768 s, 678 w, 642 s, 588 m	910 w, 808 s, 739 w, 617 m
Fe–O stretching	—	—	470 s

Note. s = strong, m = moderate, w = weak.