The signs of coupling constants involving selenium are usually unaffected by changes in the valency of selenium, but if all the selenium electron lone pairs are used for bonding there may be a sign inversion.
W. McFarlane and D. S. Rycroft, J. Chem. Soc., Chem. Commun., 1973, 10 DOI: 10.1039/C39730000010
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