Thiazyl trifluoride NSF

One of the most remarkable molecules is thiazyl trifluoride, NSF (Fig. 18.7). This compound is very stable. It does not react with ammonia at room lemperaiure. with hydrogen chloride even when hented. or with metallic sodium at temperatures below 400 C. The S—N bond. 141.6 pm, is the shortest known between these two elements. The F.SF bond nngle.s of 94° are compatible with approximate j/ bonding and the presence of an rp hybrid cr bond. ind iwo p d n bonds between ihe sulfur and the niirogen. The contraccicr of ihc J orbiuils by the inductive effect of the fluorine atoms presumably permits effective overLip and -jr-bond formation. The alternative explanation would require a double dative bond from the sulfur atom, extremely unlikely in view of the positive character of ihe sulfur atom... 

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