Abstract
WE have examined the electron spin resonance spectrum of [Fe(NO){S2CN(CH3)2}2] to investigate how the unpaired electron, which is in an anti-bonding orbital in free nitric oxide, distributes itself in a metal complex. The magnetic moment of a powdered sample at room temperature is 2.24 B.M., which shows the complex to have one unpaired electron with an appreciable orbital magnetic moment. The electron spin resonance spectrum of a benzene solution consists of three equally intense lines with a separation of 0.0011 cm−1. This triplet structure arises from an interaction between the unpaired electron and the nitrosyl nitrogen atom and indicates that the unpaired electron is in an orbital which embraces the nitrosyl group. This interaction is greater than that in free nitric oxide1 in which the splitting is 0.00099 cm−1.
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References
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GIBSON, J. Unpaired Electron in Nitroso-bis(dimethyldithiocarbamato)iron(II). Nature 196, 64 (1962). https://doi.org/10.1038/196064a0
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DOI: https://doi.org/10.1038/196064a0
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