On the nature of the spin ground state of iron(II) in Fe(2,9-di-CH 3-phenanthroline) 2(NCS) 2

• Published in: Inorganica Chimica Acta Vol. 35; pp. 285 - 287
• Main Authors: Dockum, Bruce W., Reiff, William Michael
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1979
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/S0020-1693(00)93452-2

The temperature dependence of the zero field Mössbauer spectrum and magnetic susceptibility of Fe(2,9-di-CH 3-phenanthroline) 2(NCS) 2 over the range 1.8 to 300 K shows that the complex contains spin quintet iron(II) at all temperatures. The ligand is apparently to the weak field side of the ‘crossover point’ and contrary to the results of a previous study there is no evidence of a transition to a lower multiplicity (triplet or singlet) ground state. The observed decrease of the magnetic moment (4.81 μ β at 302 K to 3.48 μ β at 1.82 K) is consistent with zero field splitting (|D|≈ 5 cm −1) of the ground spin manifold.