Report magnetic susceptibility (X//s) data from 2. 6 to 300 K for ten quasi one-dimensional organic conductors, most of which obey the law X//s equals AT** minus ** alpha with alpha congruent 0. 7 below about 20 K. Results for irradiated TTF-TCNQ and other evidence indicate that such behavior can occur for a small concentration of unpaired spins at the level of 1% per molecule. This seems to imply that in such materials there is either a long range interaction between localized spins, or that the spins themselves are only weakly localized.
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