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The mixed terminal ligand iron-sulfur clusters [F eIL 3][Fe4S4I3L] and [Fe4S4I2L '2]  (2)  with the neutral ligands L = (M e2N )2CS and L' = (C4H 9N H )2CS have been synthesized by the reaction o f F eI2L2 with 1.5 equivalents o f Fe(C O )5 and 2 equivalents o f sulfur and by the reaction o f F eI2L '2 with 3 equivalents o f Fe(CO)^ and 4 equivalents o f sulfur, respectively. The crystal structures o f 1 and  2  were determined from single crystal X -ray diffraction data. 1 crystallizes in the triclinic space group P 1 with a = 968.6( 1), b = 1466.2( 1), c = 1679.1(1) pm, a = 91.51(1),/?= 93.43( 1), y = 90.82( 1)°, V = 2379.2 * 106 pm 5, Z = 2, R = 0.054.  2  crystallizes in the m onoclinic space group P2 Jn with a = 930.2(1), b = 1666.1(1), c = 2335.6(1) pm, β = 97.26°, V = 3 5 90.8 x 106 pm 3, Z = 4. R = 0.055. The anion [Fe4S4I3L] o f 1 exhibits a nearly undistorted [Fe4S4]2+ core. The F e - S distance to the thiourea ligand is found at 230.6 pm. The m ost striking feature o f the neutral cluster o f  2  is the very short F e - F e distance (268.7 pm) between the iron atom s with thiourea ligation which is possibly a consequence of back-donation. The F e - S thiourea distances in  2  were found to be 230.8 and 231.5 pm , respectively.

[Fe 4 S 4 l 2+ -Cluster mit Thioharnstoffliganden: [FeIL 3 ][Fe 4 S 4 I 3 L]' (L = (Me 2 N) 2 CS) und [Fe 4 S 4 I 2 L' 2 ](L' = (C 4 H 9 NH) 2 CS)