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wangfw1103新虫 (小有名气)
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revealed the absence of characteristic bands of the amino group of quinoline and the carbonyl group of furaldehyde moiety of starting materials and the appearance of a new strong intensity band at 1636 cm-1 characteristic of azomethine group, v(C=N) confirm the formation of proposed ligand Schiff base framework 。 In addition, presence of medium intensity bands at 1215, 3070 and 1598 cm-1 may reasonable be assigned to v(C-O-C) stretching vibration of furan, v(C-H) aromatic stretching vibrations and v(C=N) group of quinoline moiety respectively。 Moreover bands appearing in the region 1440–1480 cm-1 , 1060–1100 cm-1 and 720–775 cm-1 were usual modes of aromatic ring vibrations。 However, a comparison of IR spectra of metal complexes with the ligand revealed a positive shift in the v (C=N) and v(C-O-C) stretching mode suggesting the coordination of ligand moiety of azomethine nitrogen and oxygen of furan moiety which is further confirmed by appearance of medium intensity bands in the range of 474–485 and 570–592 cm-1 due to v (M-O) and v (M-N) vibrations, respectively The band corresponding to azomethine group of quinoline appeared at the same position as observed in the ligand indicating the non-involvement of quinoline nitrogen in coordination.A new medium intensity broad band appeared in the region 3320–3345 cm-1 along with other medium intensity bands in the region 788–836 cm-1 and 624–633 cm-1 may be assigned to v(OH), ρr(H 2 O) and ρw(H2O) of coordinated water molecules in all the complexes except in complex 4。 However, other bands of ligand framework appeared at their estimated positions. |
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wangfw1103(空位代发): 金币+30, 感谢应助 2016-01-20 10:18:23
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| 揭示了喹啉的氨基以及作为起始原料之一的糠醛的羰基特征峰的缺失和在1636cm-1出现了高强度带，它是甲亚胺基的特征峰，碳氮的振动（v(C=N)）证实形成了所预期的席夫碱结构。此外，于1215，3070和1598cm-1处出现的中强度带可以认为分别属于呋喃C-O-C的伸缩振动，芳基C-H的伸缩振动和喹啉结构的C=N的振动。而且出现在1440-1480cm-1，1060-1100cm-1和720-775cm-1区域的吸收峰一般是芳香环的振动。然而，将金属复合物的红外谱图和配体的进行对比，揭示了C=N和C-O-C的伸缩振动的正移动，这意味着配体的甲亚胺基的氮和呋喃的氧的配位，这种配位进一步被出现在474-485和570-592cm-1处的中强吸收带所证实。这两处吸收带的出现分别是由M-O（金属-氧）和M-N（金属-氮）的振动产生。喹啉的甲亚胺基的相应的吸收带出现在同观测到的配体的吸收带相同的位置，说明喹啉的氮未参与配位。出现在3320-3345cm-1区域的新的中强吸收带和788-836cm-1、624-633cm-1出的中强吸收带可能属于除复合物4以外的其他复合物中配位的水分子的v(OH),pr(H2O),和pw(H2O)。然而，配体骨架的其他吸收带出现在预期的位置。 |
2楼2015-12-01 21:30:56
