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Table 1 Infrared frequencies (cm−1)a and tentative assignmentsb for (A) L1, (B) [Ag(L1)2(H2O)2]NO3, (C), L2 (D) [Ag(L2)2(H2O)2]NO3.H2O, (E) L3 and (F) [Ag(L3)2(H2O)2]NO3

From: Spectral, thermal, antimicrobial studies for silver(I) complexes of pyrazolone derivatives

A B C D E F Assignments
- 3379m,br 3364m,br 3364m,br ν(O–H); coordinate H2O
3100w 3100w 3066w 3100w 3099 3100 ν(C-H); aromatic
2900 2900 2890 2885 2901 2900 ν(C-H); aliphatic
1670ms 1666m 1681s 1685s,sh 1678m 1678m ν(C = O)
1550s
1400m
1523m
1410s
1496m 1408m 1527m
1381
1508s
1427vw
1520s
1415
ν(C = N)
ν(C = C)
1319s
1319s
1188s
1300s
-
1311w
1165m
1311sh
-
1311m
1172s
δb(-CH2),
ν(NO3−1)
1122s
1018w
1122s
1018w
1130m

1056w
1104vw

1099sh
1110w

1130m

ν(C–C),
ν(C-N)
ν(C = S)
954w
943vw
995w
995m
991s
921w
941vw
910vw
988w
938 s
985w
965sh
−CH-bend; phenyl
813m 792 m 779m ν(Ag ←OH2)
577w 515w 544w ν(Ag–O)
524w 498w 488w ν(Ag–N)
  1. as = strong, w = weak, sh = shoulder, v = very, br = broad, bν = stretching and δ = bending