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 extract | H1 | H1-800 | H10 | H10-800 | Hibiscus leaf extract | H6 | H6-800 | H11 | H11-800 | Assignment |
| 3564 vs, | 3387 sh | — | 3422 m | 3422 m | 3420 vs | 3338 vs | 3406 w | 3420 m | 3447 m | νOH in water | 3271 vs | 3177 vs | 3058 w | — | — | — | — | — | — | — | νOH in phenols | 2942 m | — | — | — | — | — | — | — | — | — | νCH in phenols | — | — | — | 2927 w | 2927 w | 2930 m | 2920 m | 2917 w | 2924 w | 2924 w | νCH2 asym | — | — | — | 2850 w | 2850 w | 2847 m | 2850 m | 2854 w | 2847 w | 2847 w | νCH2 sym | 2622 m | — | — | — | — | — | — | — | — | — | νOH | 2537 m | — | — | — | — | — | — | — | — | — | νOH | 1797 vs | — | — | — | — | — | — | — | — | — | γCH in phenols | 1747 vs | — | — | — | — | — | — | — | — | — | γCH in phenols | 1636 vs | — | 1622 w | 1635 w | 1635 w | 1636 vs | 1635 s | 1623 w | 1630 w | — | νOH in water | 1605 sh | 1601 vs | — | | | 1647 sh | 1647 sh | — | — | — | νCOO- asym | 1417 m | 1384 vs | 1456 sh1394 m | 1414 s1384 s | 1463 m1384 m | 1384 vs | 1384 m | — | 1384 s | — | νCOO- sym | 1270 m | — | — | — | — | 1258 m | — | — | — | — | νC-O-C asym | 1220 s | 1228 sh | — | | | — | — | — | — | — | νC-OH and δCH in phenols | 1186 s | — | — | — | — | 1120 s | — | — | — | — | νC-OH | 1093 s | — | 1110 w | 1110 w | 1114 m | 1042 s | 1046 m | 1051 w | 1098 m | 1098 m | νC-O-C sym | 1065 s | 1077 m | — | — | 1049 m | — | — | 985 w | — | 986 w | νC-O-C sym | 952 m | 963 w | 940 w | — | — | — | — | — | — | — | δCH in phenols | 914 w | 914 w | — | — | — | 899 m | — | — | 831 w | 844 w | γCH ring vibration | 862 m | 847 w | 832 w | 859 w | 863 w | 809 m | — | — | — | — | γCH ring vibration | 776 w | 790 w | — | | | 699 m | — | — | — | — | γCH ring vibration | 717 m | — | — | — | — | 617 m537 m | — | — | — | — | γCH ring vibration | — | 653 m | 587 vs | 571 m | 591 vs | — | 591 s | 578 vs | 560 s | 587 vs | νM-O in spinel | 583 m | 383 s | 382 m | 386 s | | 423 s | 375 vs | 379 s | 375 vs |
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vs = very strong, s = strong, m = medium, w = weak, and sh = shoulder.
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