Issue 9, 2007

New crystalline form of 7-amino-4-methylcoumarin (coumarin 120)—a polymorph with 1 ∶ 1 valence tautomers

Abstract

A new, more stable, polymorph of 7-amino-4-methylcoumarin (coumarin 120) has been obtained from a (1 ∶ 1) MeOH/THF mixture. This is the first example of a polymorphism where two molecules of the independent unit have two different electronic structures (valence tautomers).

Graphical abstract: New crystalline form of 7-amino-4-methylcoumarin (coumarin 120)—a polymorph with 1 ∶ 1 valence tautomers

Supplementary files

Additions and corrections

Article information

Article type
Communication
Submitted
18 May 2007
Accepted
25 Jun 2007
First published
13 Jul 2007

CrystEngComm, 2007,9, 735-739

New crystalline form of 7-amino-4-methylcoumarin (coumarin 120)—a polymorph with 1 ∶ 1 valence tautomers

D. Niedziałek and Z. Urbanczyk-Lipkowska, CrystEngComm, 2007, 9, 735 DOI: 10.1039/B707581B

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