Thiocyanogen stabilization

Draw two possible structures for thiocyanogen, (SCN)2, and comment on the relative stability of the structures you draw. 

All methods that have been suggested for the preparation of thiocyanogen solutions involve the use of strictly anhydrous solvents, since the presence of moisture causes rapid hydrolysis and decomposition to take place. It is possible, howeyer, to stabilize thiocyanogen in aqueous solution to a limited extent by the presence of large quantities of potassium thiocyanate. 

HFA has been reacted with a series of dicyanosulfanes NCS CN (n = 1 -4) under the catalytic action of triethylamine. The monosulfane produces a red oil which shows extensive decomposition during attempts of purification (176). Spectral data suggest formation of a A -l,3,5-dioxazine ring system as has been found in the reactions of the homologous dicyanoselenane [Eq. (116)] and thiocyanogen with HFA, which results in compound 140. The X-ray structure has been reported. A remarkable feature is the stability of the... 

Thiocyanogen Generated from Salts by Electrolysis. Thiocyanogen is produced when concentrated solutions of alkali thiocyanates are electrolyzed. Ammonimn thiocyanate is most commonly used, and the electrolyzed solution is stabilized by maintaining it at tempera-... 

Decoloration of the bromine solution by lead thiocyanate is usually immediate if a protracted induction period appears to be indicated, it can be terminated readily by exposure of the solution to direct sunlight. As heat is evolved by the reaction, the flask must be cooled regularly during the preparation to maintain the low temperature necessary to stabilize the thiocyanogen. At the end of the reaction lead thiocyanate should remain in about 10% excess. Solutions of pure thio-cyanogen are water-clear and colorless. Filtration of the solution is of little advantage and is not easily accomplished without the appearance of a pink coloration indicative of the presence of moisture. 

Matsuyama et al found that sulphonium ylide formation from a sulphide and a stabilized diazo-compound could be effectively catalysed by condensation in the presence of a dialkoxy disulphide, and less well in the presence of thiocyanogen. The reaction was thought to involve initial complex... 

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