Novel Cesium Contact Ion Multiples with Tetraphenylethanediyl and 1,1,4,4-Tetraphenylbutadiene-2,3-diyl π-Dianions: Crystallization and Structure

Organocesium compounds, which are still a rarity, are easily prepared using a droplet of liquid cesium and occasional ultrasonic surface reactivation. Despite their extreme air sensitivity, structure analysis has been achieved under a cooled-N2 flow both for the black coordination polymer (tetraphenylethanediyl)dicesium bis(diglyme) ([(Ph2CCPh2)2-(Cs+(diglyme)2]∞), which exhibits the expected cyanine distortion with the molecular halves -C(C6H5)2 twisted by 76° around the central CC single bond of 1.51 A length, and for the violet-blue coordination polymer (1,1,4,4-tetraphenylbutadiene-2,3-diyl)tetracesium bis(diglyme) bis(2-methoxyethanolate) ([(Ph2C(CHCH)CPh2)2-(Cs+(diglyme))(Cs+-OCH2CH2OCH3)2]∞), which shows a bond alternancy change relative to the hydrocarbon, >CC(H) (H)CC C-C(H)(H)C-C<.