Abstract
The structure of the previously reported (py)3ZnFe(CO)4 (py = pyridine) has been determined, confirming the monomeric nature of this species. The complex has average Zn–N and Zn–Fe bond lengths of 2.0970(7) and 2.4017(3) A, and features a coordination geometry about Fe which is intermediate between trigonal bipyramidal and face monocapped tetrahedral. The space group is P21/c, with a = 8.22080(10) A, b = 16.1668(3) A, c = 15.4669(3) A, β = 102.5869(11)°, V = 2006.21(6) A3, Dcalc. = 1.558 g/cm3 at 150(1) K. A monomeric cadmium analogue, (pyridine)(neocuproin)CdFe(CO)4, has also been synthesized, and found to possess a similar geometry, with average Cd–N and Cd–Fe bond lengths of 2.352(2) and 2.5380(5) A. The space group is $$ P\overline{1} $$ with a = 10.8900(2) A, b = 11.3042(3) A, c = 15.5488(4) A, α = 85.1251(10)°, β = 84.3468(14)°, γ = 72.0377(15)°, V = 1808.93(7) A3, Dcalc. = 1.478 g/cm3 at 150(1) K. The structures of the monomeric (py)3ZnFe(CO)4 and (py)(neocuproin)CdFe(CO)4 complexes have been determined, and suggest the use of significantly greater s character in the main group elements’ bonds with iron as opposed to nitrogen.
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