Thionitrosyl cyanide

Dissociative ionization of [l,2,5]thiadiazolo[3,4-f][ l,2,5]thiadiazole 6 was found to be an efficient preparative route to in j// -generated thionitrosyl cyanide and its radical cation, both of which are stable and did not undergo unimolecular rearrangement under the reaction conditions. The [C,N2,S] ions were characterized by mass spectrometry (ml% 72) (see Section 10.05.3.2.2) <1997JST(418)209>. 

Thionitrosylchloride (Cl-N=S) [162] and thionitrosyl cyanide (NC-N=S) [163] were generated in the gas phase and found to be moderately stable on the microsecond time scale. Both molecules and their isomers were characterized by high-level ab initio calculations so that the energetics of their isomerization and dissociations is well understood. 

Several diatomic ligands similar to CO are worth brief mention. Two of these, CS (thiocarbonyl) and CSe (selenocarbonyl), are of interest in part for purposes of comparison with CO. Several other common ligands are isoelectronic with CO and, not surprisingly, exhibit structural and chemical parallels with CO. Two examples are CN (cyanide) and N2 (dinitrogen). In addition, the NO (nitrosyl) ligand deserves discussion because of its similarities with CO. NS (thionitrosyl) and other ligands isoelectronic with NO also are considered briefly. 

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