Table 7. Wavenumbers and intensity of selected bands from the experimental IR and Raman spectra of studied compounds.

Chromone		Flavone		3-hydroxyflavone		3,7-Dihydroxyflavone		Galangin		Kaemferol		Quercetin		Assignment
IR	R	IR	R	IR	R	IR	R	IR	R	IR	R	IR	R
				3208 s		3575–3259 s		3500–3184 s		3352–3325 s		3390–3250 s		νOH
3085 m*	3070 vs	3059 w	3068 m	3072 w	3072 w		3078 w		3070 m	3079 w	3075 w		3080 w	νCH
1650 vs	1669 m	1646 vs	1634 vs	1607 vs	1618 vs	1610 vs	1637 vs	1658 vs	1661 s	1657 vs	1649 w	1664 s	1661 w	νC = O
1616 s	1636 vw	1619 m	1618 m	1627 sh		1626 s		1632 vs	1628 vs	1619 vs	1608 vs	1612 vs	1608 vs	νCC
1600 m	1615 s	1606 m	1604 s		1596 s		1599 s	1607 vs	1603 vs	1599 vs				νCC
1566 m	1567 m	1569 m	1570 m	1562 s	1567 s	1572 s	1576 m	1565 s	1567 s	1564 m	1558 s	1562 s	1548 s	νCC
						1520 m	1521 vw	1514 m	1522 w	1511 s	1520 m	1522 s		νCC
1474 sh		1496 m		1481 s		1492 w	1499 w		1496 w					νCC
1462 vs	1463 w	1466 s	1470 w	1470 s	1472 w	1467 s	1450 m	1468 w	1453 w		1443 m	1462 m	1440 s	νCC
1405 s	1506 w	1406 w		1416 s	1414 m	1428 m	1416 m		1399 w		1422 m	1408 m	1403 m	νCC
				1286 s	1310 m	1284 vs	1310 m	1319 s	1301 m	1319 s	1319 s	1320 s	1326 s	βOH
1235 m	1241 m	1225 m	1235 m	1212 s	1230 w	1208 m		1219 s	121 9 w	1219 s	1215 w	1200 s	1220 w	νCOC, νCC
				1184 m	1189 w	1177 vs	1177 m	1175 vs	1187 w	1166 vs	1171 s	1168 vs	1177 w	νC-OH
1126 s	1128 m	1129 s	1132 w	1130 s	1132 w	1133 s	1140 w	1126 m		1112 m	1119 w	1132 m	1138 w	βCH
1078 w	10 86 w	1078 w	1080 w	1076 m		1074 w		1072 m	1089 w	1086 m	1088 w	1092 m	1113 m	νCH
1035 m	1036 m	1044 m	1046 w	1034 m	1035 w	1032 w		1031 m						νCH
1011 m	1014 m	1010 w	1000 m	999 m	993 m	1008 w	1001 s	1008 m	1002 m	1007 s	1007 w	1014 s	1014 vw	νCH
969 m	966 w	959 w	963 vw	956 w	956 w	964 w	965 w	977 m	978 m	977 m	979 w			νCH
		906 m	907 vw	898 m		884 m		882 m		882 s	882 w
841 s		851 m		853 w	839 w	826 m	844 w	836 m		828 m	819 w	824 s		γCH
775 s	774 w	769 s	774 w	776 s	777 w	772 m	767 w		795 vw			796 m	786 w
758 s		756 s		759 vs		759 m		769 m	769 vw	768 w		785 w	771 w	γCH
680 m		687 m	674 w	704 s	707 w	691 s	699 w	702 m	709 w	704 m	729 w	702 m	721 w	αCCC
	686 w	673 m		690 s	674 w			690 sh	688 vw	687 w	688 w	681 s	661 w	αCCC
		648 w		657 w		656 vw		636 m	639 w	638 m	639 w	659 w		γC = O
				623 m	621 w	623 m	621 w	617 w	614 w	616 w		639 m	640 w	γOH
	576 m		578 w		579 w		585 w		580 w		584 w		604 m	αCCC
525 m	534 w	528 m	513 w	510 w	513 vw	512 w	517 w	526 w	525 w	521 w	522 w	527 w	522 w	αCCC
470 m		500 w		474 m		473 m		470 w		463 w		450 w		ϕCC
404 m		456 w		438 w				412 w		410 w		408 w		ϕCC

symbols denote: ν—stretching, β—deforming in-plane, γ—out of plane bending vibrations; α—deforming in plane of the aromatic ring; ϕ–deforming out of plane of the aromatic ring s—strong, m—medium, w—weak, v—very, sh—shoulder.