The crystal structure of
8-hydroxy-1H-naphtho[2,1,8-mna]xanthen-1-one, C19H10O3,
obtained as an indefinite methanolsolvate, has been
determined at 295K by single-crystal X-ray diffraction methods, being refined
by full matrix least squares to a residual of 0.056 for 892 independent 'observed'
reflections. Crystals are monoclinic, P21/c, a 5.128(4), b 10.024(9), c 27.45(2) �, β 107.73(6)�, Z 4.
The packing of the molecules is typically that of charge-transfer complexes, with
an interplanar spacing of c.3.5 �.