Trans-Fused Macrobicycle'Betweenanene'around a Planar Cu_2(mu-CH_3O)_2 Core Showing Remarkable Antiferromagnetic Interaction

摘要

Complexation of 4,6-bis{3-(2-pyridyl)-1H-pyrazol-1-yljpyrimidine(bppp)and copper(II)tetrafluoroborate in methanol gave a self-assembled [Cu_2(CH_3O)_2(bppp)_2]~(2+)ion having a betweenanene-type structure.Each bppp spans across the common Cu_2O_2 plane in a trans fashion to ligate each copper center.The antiferromagnetic interaction observed in the Cu_2O_2 core is ascribable to the superexchange along the Cu-O-Cu linkage and found to be one of the largest among the analogous compounds,owing to the large Cu-O-Cu angle perturbed with the two bppp molecular tweezers.