Trapping CS22- and S32- between Two Ytterbium Formamidinates.

Treatment of [YbII(DippForm)2(thf) n] ( n = 2 (1aYb), n = 1 (1bYb); DippForm = N, N'-bis(2,6-diisopropylphenyl)formamidinate), with either excess CS2 or S8 gives [YbIII2(DippForm)4(CS2)] (3) and [YbIII2(DippForm)4(S2)0.5/(S3)0.5] (4) respectively. 3 is a new addition to an exclusive class of compounds containing the CS22- dianion, and 4 is the first crystallographically characterized example of a rare-earth trisulfide complex.