Aggregation of the Half-Sandwich Trisulfido Complex of Tungsten with Silver Ions: Synthesis of a Cyanide-Bridged Helical Polymer {[(η5-C5Me5)WS3]2Ag3(CN)}∞ and a Cyclic Cluster [(η5-C5Me5)WS3Ag]4

An unusual cyanide-bridged helical polymer {[(η5-C5Me5)WS3]2Ag3(CN)}∞ (1) was obtained from the reaction between (PPh4)[(η5-C5Me5)WS3] and AgCN, which also gave a trace amount of an octanuclear cluster [(η5-C5Me5)WS3Ag]4 (2). The latter cluster 2 was prepared in high yield from the reaction of (PPh4)[(η5-C5Me5)WS3] with [Ag(CH3CN)4](PF6).