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Controlled potential electrolysis of the dilithium salt of phthalocyanine, Li2(pc2-), at 0.15 V vs. saturated calomel electrode in acetonitrile gave a lithium complex of the phthalocyanine radical, the crystal structure of which shows that it contains a unit cell with four nearly planar Li(pc・-) molecules of S4 symmetry, stacked metal-over-metal with an Li-Li spacing of 3.245(2)A, and staggered by 38.7(3)°; its effective magnetic moment decreased from the room temperature value of 1.3 μB to 1.0 μB at 150 K, but upon further cooling it increased to approach the free-spin value.
Synthesis and molecular structure of a lithium complex of the phthalocyanine radical
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