โ Scribed by A.R. Harutyunyan; A.A. Kuznetsov
No coin nor oath required. For personal study only.
The nickel(II) complexes of phthalocyanine (four-coordinate, low spin) in pyridine were investigated by EPR spectroscopy and by magnetic susceptibility. The ESR spectra of Ni(II) complexes in frozen (77 K) pyridine solution exhibit well-resolved superhyperfine lines. We attributed this to the formation of six-coordinate high-spin Ni(II) complexes and the interaction of the magnetic moment of the Ni(II) ions with the in-plane and out-of-plane (solvating molecules) nitrogen atoms. Due to the aggragation of molecules, no resolved spectrum could be obtained. The EPR spectrum of the solid-state compound, which was obtained by evaporation of the solution, exhibits a single broad line. The magnetic susceptibility of this compound obeys the Curie-Weiss law with a Weiss constant of 0 = -82.9 K. It prefers Ni(l' T)... N(J, )N( T)... Ni( $ $) types of interaction.
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