A reflection on neptunium absorption: The absorption spectrum of NpV around 980 nm originates from a 5f→5f electric-dipole transition, which is allowed if the NpV ion lies in a coordination environment that lacks a center of inversion, such as in [NpO2(H2O)5]+. However, the transition is completely forbidden by Laporte's rule in the highly symmetrical NpV diamide complex [NpO2(L)2]+ (see structure; Np green, O red, N blue, C gray).
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Tian et al. (2005) studied this question.
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