Crystal structure of 5,12-dihydro-5-methylquino[2,3-b]acridine-7,14-dione, C21H14N2O2, at 93 Κ

Abstract

to cancel the dipole moment to stabilize themselves electrostatically. There are chains of intermolecular hydrogen bonds between the NH group of one molecule in the one column and the O atom of another molecule in the neighboring column. That is, the intermolecular Η-bond bridges the two different stacking columns in such a way that one molecule is hydrogen-bonded to two neighboring molecules. The present molecular arrangement is basically quite similar to the one observed for the γ phase of unsubstituted quinacridone [5,7] and also indigos [8,9].