Abstract
The compound Mn 1.5Mo 8O 11 is prepared in single phase form by reaction of intimate mixtures of MnMoO 4, MoO 3 and molybdenum powders in the mole ratio 9:10:29 in sealed molybdenum tubing at 1450 °C for 4 days. The thin, hair-like needles crystallize in the monoclinic system, space group P2 1 a , a = 9.8463(8) A ̊ , b = 16.896(1) A ̊ , c = 2.8462(3) A ̊ , β = 94.95(1)°, Z = 2 . The structure, solved and refined to R = 0.038, consists of infinite chains of trans-edge-shared octahedral cluster units coupled together through MoOMo interchain linkages. The unique mode of interchain linking provides channels in which the manganese atoms reside and impose unusual square planar and teeter-toter geometry for the interchain bridging oxygen atoms. Magnetic susceptibility measurements show that manganese is present as high spin Mn 2+ and resistivity data on single crystals parallel to the infinite chain axis demonstrate metallic behavior. The octahedral cluster repeat units in the infinite chains, Mo 4O 5.5 1.5−, each have 14.5 electrons for MoMo bonding and bond order sums indicate that these electrons are utilized efficiently for this purpose.
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