Here is an article that describes both linkages, known as linkage isomers. Thiocyanates are discussed more fully but scroll down to Organic thiocyanates to see how they are bonded as isothiocyanates.
http://en.wikipedia.org/wiki/Thiocyanate
THe thiocyanate ion acts as a Lewis base, donating a pair of electrons to the Fe ^ 3+ ion. Both sulfur and nitrogen atoms have lone pair electrons that can potentially be donated. Therefore, ther are two different structures (linkage isomers) that can be created when Fe(H2O)6 ^+3 reacts with SCN-.
How does the Lewis structure of the two isomers look like??
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