Synthesis of single and double butterfly iron carbonyl complexes by reactions of [(μ-RSe)(μ-CO)Fe 2(CO) 6] − anions. Crystal structures of (μ- p-MeC 6H 4Se)[μ-PhCH 2N(H)CS]Fe 2(CO) 6 and [(μ-PhSe)(μ-MeAs)Fe 2(CO) 6] 2

Abstract

The in situ reactions of the [Et 3NH] + and [MgBr] + salts of [(μ-RSe)(μ-CO)Fe 2(CO) 6] − ( 1) anions with PhC(Cl)NPh gave single butterfly complexes (μ-RSe)(μ-PhCNPh)Fe 2(CO) 6 ( 2, R=Ph; 3, R= p-MeC 6H 4; 4, R=Et), whereas those of the [Et 3NH] + salts of 1 with R′NCS afforded single butterfly complexes (μ-RSe)[μ-R′N(H)CS]Fe 2(CO) 6 ( 5, R=Ph, R′=Ph; 6, R= p-MeC 6H 4 R′=Ph; 7, R= p-MeC 6H 4, R′=PhCO; 8, R= p-MeC 6H 4, R′=PhCH 2). Compound 8 could also be prepared by reaction of the [MgBr] + salt of 1 (R= p-MeC 6H 4) with PhCH 2NCS followed by treatment with CF 3CO 2H. More interestingly, while the [Et 3NH] + salt of 1 (R=Ph) reacted with Et 3OBF 4 to give a carbyne ligand-bridged single butterfly complex (μ-PhSe)(μ-EtOC)Fe 2(CO) 6 ( 9), reaction of the [Et 3NH] + salt of 1 (R=Ph) with MeAsI 2 produced a MeAsAsMe ligand-bridged double butterfly complex [(μ-PhSe)(μ-MeAs)Fe 2(CO) 6] 2 ( 10). All the new complexes, 2– 10, were characterized by elemental analysis and various spectroscopic methods, for complexes 8 and 10, the structures were also confirmed by X-ray diffraction techniques.