The salt 6,6′-spirobi[1,4,8,11-tetra-azacyclotetradecane]nickel(II) tetraperchlorate {C-spiro-bi-[cyclam nickel(II)]} was isolated as single crystals and the X-ray crystal structure obtained; a deviation in orthogonality of the macrocyclic rings, resulting in possible Ni–Ni interaction, is deduced from the e.s.r. spectra of the oxidised forms of the complex.
A. McAuley, S. Subramanian and T. W. Whitcombe, J. Chem. Soc., Chem. Commun., 1987, 539 DOI: 10.1039/C39870000539
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