Proton Magnetic Resonance in Antiferromagnetic Ni(NH3)2Ni(CN)4·2C6H6

The magnetic spin structure of the antiferromagnetic Ni(NH 3 ) 2 ·Ni(CN) 4 2C 6 H 6 has been investigated by means of proton nuclear magnetic resonance measurements. From the angular dependence of resonance lines in an external field, an ordered magnetic structure (unit cell dimension, a * = a , b * =2 a and c * =2 c ) is inferred in which ferromagnetic chains parallel to a -axis, are arrayed antiferromagnetically to adjacent chains. The magnitude of internal fields at proton sites could be explained by single domain model. But the rotating diagram of the resonance patterns in the c -plane shows that the substance has antiferromagnetic domains.

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