Thiolates are relatively basic ligands, being derived from conjugate acids with pK's of 6.5 (thiophenol) to 10.5 (butanethiol).  Consequently, thiolate ligand often bridge pairs of metals.  One example is Fe(SCH)(CO).  Thiolate ligands, especially when nonbridging, are susceptible to attack by electrophiles including acids, alkylating agents, and oxidants.