Crystallization and Structural Characterization of Dimeric and Trimeric Forms of (Neocuproine)CdFe(CO)4

Abstract

The previously reported (neocuproine)CdFe(CO)4 has been found to crystallize as either a dimer or a trimer depending on the procedure used. These species exist as nearly planar four- and six-membered rings composed of alternating cadmium and iron atoms. The trimeric form is reasonably similar to its 2,2′-bipyridyl analogue, while the dimeric form had not been observed previously for a LxCdFe(CO)4 complex. The space group for the dimeric isomer is C2/c, with a=20.7044(3), b=12.2169(2), c=13.7837(2)  Å, and β=98.1226(11)°, while for the trimeric isomer the space group is P1̅, with a=14.5056(1), b=15.4331(1), c=17.3372(2)  Å, α=110.0059(3)°, β=104.2580(4)°, and γ=95.2796(5)°.