Formation and Structure of the Novel Heptanuclear Lead(II) Oxo Cluster [Pb7(μ3-O)(μ4-O)(μ3-OMe)4(μ2-I)4]I2 with an Unprecedented Cage Structure

A novel lead(II) cluster [Pb7(μ3-O)(μ4-O)(μ3-OMe)4(μ2-I)4]I2 (1) has been isolated from the reaction mixture of PbI2 and pyrazine in DMF/MeOH solvent with a reasonable yield (46%). The X-ray crystallography shows that 1 exhibits a novel unprecedented cage structure with centered μ3-O and μ4-O atoms and four different coordination environments of lead atoms. It is the first structurally characterized example of a lead compound containing bridging oxo, methoxide and iodide ligands. Compound 1 crystallizes in the tetragonal space group P421m, a = b = 11.7768(13), c = 9.8606(16) Å, Z = 2, V = 1367.6(3) Å3. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)