Research Article

Green Synthesis Methods of CoFe2O4 and Ag-CoFe2O4 Nanoparticles Using Hibiscus Extracts and Their Antimicrobial Potential

Table 2

The characteristic bands of the hibiscus flower/leaf extracts, CoFe2O4 and Ag-CoFe2O4 samples.

Hibiscus flower extractH1H1-800H10H10-800Hibiscus leaf extractH6H6-800H11H11-800Assignment

3564 vs,3387 sh3422 m3422 m3420 vs3338 vs3406 w3420 m3447 mνOH in water
3271 vs3177 vs3058 wνOH in phenols
2942 mνCH in phenols
2927 w2927 w2930 m2920 m2917 w2924 w2924 wνCH2 asym
2850 w2850 w2847 m2850 m2854 w2847 w2847 wνCH2 sym
2622 mνOH
2537 mνOH
1797 vsγCH in phenols
1747 vsγCH in phenols
1636 vs1622 w1635 w1635 w1636 vs1635 s1623 w1630 wνOH in water
1605 sh1601 vs1647 sh1647 shνCOO- asym
1417 m1384 vs1456 sh1394 m1414 s1384 s1463 m1384 m1384 vs1384 m1384 sνCOO- sym
1270 m1258 mνC-O-C asym
1220 s1228 shνC-OH and δCH in phenols
1186 s1120 sνC-OH
1093 s1110 w1110 w1114 m1042 s1046 m1051 w1098 m1098 mνC-O-C sym
1065 s1077 m1049 m985 w986 wνC-O-C sym
952 m963 w940 wδCH in phenols
914 w914 w899 m831 w844 wγCH ring vibration
862 m847 w832 w859 w863 w809 mγCH ring vibration
776 w790 w699 mγCH ring vibration
717 m617 m537 mγCH ring vibration
653 m587 vs571 m591 vs591 s578 vs560 s587 vsνM-O in spinel
583 m383 s382 m386 s423 s375 vs379 s375 vs

vs = very strong, s = strong, m = medium, w = weak, and sh = shoulder.