First linear alignment of five C-Se center dot center dot center dot O center dot center dot center dot Se-C atoms in anthraquinone and 9-(methoxy) anthracene bearing phenylselanyl groups at 1,8-positions

Five C-i-Se...O...Se-C-i atoms in anthraquinone and 9-(methoxy) anthracene bearing phenylselanyl groups at 1,8-positions align linearly, the origin of which is shown to be a non-bonded 5c-6e interaction of the five atoms.