| Abstract
| - Reactions of the selenium-centered anions (μ-RE)(μ-Se-)[Fe2(CO)6]2(μ4-Se), generated from [(μ-RE)(μ-CO)Fe2(CO)6]- and (μ-Se2)Fe2(CO)6, with mono- and dihalides PhCH2Br, MeI, 1,2-(BrCH2)2C6H4, or 1,3-(BrCH2)2-5-MeC6H3 afforded a series of double and quadruple butterfly cluster complexes containing (μ-RE)(μ-Se)[Fe2(CO)6]2(μ4-Se) (E = S, Se, Te) structural moieties. Three crystal structures are reported.
- The [Et3NH]+ or [MgBr]+ salts of anions [(μ-RE)(μ-CO)Fe2(CO)6]- (1, E = S, Se, Te) reactedwith (μ-Se2)Fe2(CO)6 followed by treatment of the [Et3NH]+ or [MgBr]+ salts of theintermediate selenium-centered anions (μ-RE)(μ-Se-)[Fe2(CO)6]2(μ4-Se) (3) with monohalidePhCH2Br or MeI to give a series of double butterfly Fe/E cluster complexes (μ-RE)(μ-R1Se)[Fe2(CO)6]2(μ4-Se) (4, RE = EtS, R1 = PhCH2; 5, t-BuS, PhCH2; 6, p-MeC6H4Se, PhCH2; 7,p-MeC6H4Se, Me; 8, p-MeC6H4Te, PhCH2; 9, p-MeC6H4Te, Me). Similarly, reaction of the insitu prepared [Et3NH]+ salt of the intermediate selenium-centered anion (μ-t-BuS)(μ-Se-)[Fe2(CO)6]2(μ4-Se) with dihalide 1,2-(BrCH2)2C6H4 or 1,3-(BrCH2)2-5-MeC6H3 afforded quadruple butterfly Fe/E cluster {(μ-t-BuS)[Fe2(CO)6]2(μ4-Se)}2(μ-1-SeCH2C6H4CH2Se-2-μ) (10)or double butterfly Fe/E cluster (μ-t-BuS)[(μ-1-SeCH2-3-BrCH2-5-MeC6H3)[Fe2(CO)6]2 (μ4-Se) (11) and quadruple butterfly Fe/E cluster {(μ-t-BuS)[Fe2(CO)6]2(μ4-Se)}2(μ-1-SeCH2-5-MeC6H3CH2Se-3-μ) (12), respectively. All the new products 4−11 have been characterizedby elemental analysis, IR, 1H and 77Se NMR spectroscopy, and for 4, 7, and 9 single-crystalX-ray diffraction techniques.
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