Synthesis of double and multiple butterfly Fe/E (E=S, Se, Te) cluster complexes via reactions of complex anions [(μ-RE)(μ-CO)Fe 2 (CO) 6 ] - (E=S, Se, Te). Crystal structures of (μ-p-MeC 6 H 4 Se)(μ-MeS)[Fe 2 (CO) 6 ] 2 (μ 4 -S) and {(μ-t-BuS)[Fe 2 (CO) 6 ] 2 (μ 4 -S)} 2 [(μ-p-SCH 2 ) 2 C 6 H 4 ]