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The complexes of salicylaldehyde cyanoacetylhydrazone (H2L1) and its derivative, 1-salicylhydrazo-3-imino-3-ethoxy-propionic acid hydrazide (H2L2), have been isolated and characterized by conventional physical and chemical methods. H2L1 complexes are only obtained on using metal acetate. Use of chloride, bromide, or sulphate counter ions results in the acid catalyzed addition of ethanol to coordinated H2L1 to give complexes of H2L2. IR spectral data indicate that H2L1 coordinates in a tridentate manner via the azomethine nitrogen, the OH (phenolic) and the enolized carbonyl oxygen, while H2L2 bonds through the azomethine nitrogen, carbonyl oxygen and the OH (phenolic) with displacement of a hydrogen atom from the OH (phenolic) in case of the enol form. The stereochemistry of Co(II), Ni(II) and Cu(II) complexes has been discussed and elucidated with the help of magnetic and spectral measurements.
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El-shazely et al. (1990) studied this question.
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