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The syntheses of two binuclear complexes of molybdenum(III) is reported. The oxidation of LMo(CO) 3  (L = 1,4,7-triazacyclononane, C 6 Hi 5 N 3 ) with bromine in chloroform (0.75% ethanol) yields the monomeric complex [Mo v LOBr 2 ](Br 3 ) (μ eff (298 K) = 1.61 μ B ). Reduction of this species in aqueous solution with Zn under an argon atmosphere at 25 °C affords - upon addition of NaBr - green crystals of [Mo 2 L 2 (μ-OH)(μ-Br)Br 2 ]Br 2  · 4H 2 O. The reduction at elevated temperatures yields green crystals of [Mo 2 L 2 (μ-OH) 2 Br 2 ]Br 2  ·2 H 2 O. Both complexes exhibit antiferromagnetic behaviour. The crystal structure of [Mo 2 L 2 (μ-OH)(μ-Br)Br 2 ]Br 2  · 4 H 2 O con­sists of dinuclcar cations, bromide ions and water of crystallization. It crystallizes in the triclinic space group P1 with cell constants a = 821.3(3). b = 837.7(2), c = 1008.1(3) pm, α = 103.63(2)°, β = 98.92(2)°, γ = 79.54(2)° and Z = 1. The two Mo(III)-centers are in a distorted octahedral environment of the tridentate amine, a terminal bromo-ligand and one hydroxo- and one bromide bridging ligand (edge sharing). The short Mo-Mo distance of 255.8(3) pm indicates strong metal- metal bonding.

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Zweikernige Komplexe des Molybdan(III): Die Kristallstruktur von μ-Bromo-μ-hydroxo-bis- [bromo(1,4,7-triazacyclononan)molybdan(III)]dibromid · Tetrahvdrat Dinuclear / Complexes of Molybdenum(III): The Crystal Structure of μ-Bromo-μ-hydroxo-bis- [bromo(1 ,4,7-triazacyclononane)molybdenum(III)]dibromide · tetrahydrate