Inorganic quadricyclanes: synthesis and characterization of novel sulfur- and selenium-bridged mixed Cr/Fe clusters, CrFe<SUB>2</SUB>(CO)<SUB>10</SUB>E<SUB>4</SUB> (E = S, Se). Crystal structure of CrFe<SUB>2</SUB>(CO)<SUB>10</SUB>Se<SUB>4</SUB>

The new clusters CrFe2(CO)10E4 (E = S, 1; E = Se, 2) have been isolated from the room-temperature reactions of Fe2(CO)6( &#956;-E2) and Cr(CO)5(THF), and the structure of CrFe2(CO)10Se4has been established by single-crystal X-ray diffraction methods