No abstract

An analysis will be presented of the variations observed for apparently chemically-equivalent bond distances and bond angles in cyclic molecules containing segments of alternating sulfur and nitrogen atoms. The analysis takes into account a series of sulfur-nitrogen compounds recently prepared, including heterocyclic molecules containing titanilli~, sulfUr, and nitrogen in the ring. One of the latter structures, that of (CSHS)2TiS3N4' contains an eight-membered -TiNSNSNSN-ring which is nearly planar for the seven atom S-N portion of the ring. Because this structure has twelve molecules in a unit cell of symmetry P2 1 /c, it provides interesting data on the typical variations observed in these distortable rings.Examples of unexpected distortions in other sulfur-nitrogen rings can be discussed in terms of second order Jahn-Teller effects. The conclusions of this analysis will address the possible pitfalls in making bonding rationales for sulfur-nitrogen ring molecules on the basis of solid-state structures, In addition we shall present comparative structural details of the hfb-\, interactions in these complexes, showing how they relate to the electronic configurations of the metal atoms. 09.3-17