The potassium carbonate and thiocarbonate salts K2CO3-n S n (n= 0, 1, 2, 3) and the related monoalkyl derivatives KXYCZR (X, Y, Z= O, S; R= CH3, CH2CH3, CH (CH3) 2) were synthesized, in part following newly developed methods. The corresponding isotropic solid- state 13C and aqueous solution 13C and 1H chemical shift data were measured. Trends in the 13C chemical shift values are interpreted in terms of concepts on the structure ...