Infrared spectra of FeSO
4, Na
2edta, MgSO
3-
14NO and
15NO systems, and those of related substances were measured in aqueous solution phase.The results showed that EDTA present in the solution forming a complex of Fe (II) edta (
υaCOO, 1, 597cm
-1), NO is absorbed to the complex through the formation of NO-Fe (II) edta coordinate bond (
υNO 1, 775,
vaC00 1, 610cm
-1), and that the coordinated NO react with S0
3-to form imido-di-sulfonate or nitriro-tri-sulfonate and or compound analogous to them (
υ S0, 1, 260, 1, 230, 1, 030em
-1).Stretching vibration frequency of the coordinated
14NO, 1, 775cm
-1, suggests that the edta has no activity to promote the reduction of the NO.It was found that a part of the Fe (II) is oxidized to Fe (III) in the present reaction, which is considered to be probably caused from the absorbed NO.It should be also noted that Fe (II) edta-NO (1, 775cm
-1) was distinguishably observable from Fe (II)-NO (1, 810cm
-1), as well as Fe (II) edta (1, 597cm
-1) from Fe (II) edta (1, 620cm
-1) with the use of IR technique.
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