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-N 2 flow both for the black coordination polymer (tetraphenylethanediyl)dicesium bis(diglyme) ([(Ph 2 C CPh 2 ) 2- (Cs + (diglyme) 2 ] ∞ ), which exhibits the expected cyanine distortion with the molecular halves - C(C 6 H 5 ) 2 twisted by 76° around the central CC single bond of 1.51 Å length, and for the violet-blue coordination polymer (1,1,4,4-tetraphenylbutadiene-2,3-diyl)tetracesium bis(diglyme) bis(2-methoxyethanolate) ([(Ph 2 C (CHCH) CPh 2 ) 2- (Cs + (diglyme))(Cs +- OCH 2 CH 2 OCH 3 ) 2 ] ∞ ), which shows a bond alternancy change relative to the hydrocarbon, >C C(H) (H)C C< + 2e - → >C - C(H) (H)C - C<.