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You should have noticed the difference between H2salpn ligand you made last week and H2salen ligand...

You should have noticed the difference between H2salpn ligand you made last week and H2salen ligand you made this week. Why H2salen precipitate from the alcohol solution, while H2salpn does not?

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Answer #1

H2salen precipitate from the alcohol solution, since it has -OH groups facing each other internally in the molecule and the entire hydrophobic organic moiety is facing the external side and the internally oriented hnydrophilic -OH groups are involved in intramolecular H bonding and does not encourage H bond formation with alcohol unlike H2salpn in which the OH gropus are arranged facing the exterior of the molecule and this hydrophilicity of the outer surface makes it soluble in alcohol through H bond formation.

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