D. Schaniel, Th. Woike, J. Schefer, V. Petrícek, K. W. Krämer, and H. U. Güdel
Neutron diffraction shows a photoinduced isonitrosyl linkage isomer in the metastable state SI of Na₂[Fe(CN)₅NO]·2D₂O
Phys. Rev. B 73, 174108/1-5 (2006)                 

Abstract: We report neutron diffraction experiments on the light-induced metastable state SI in single crystals of Na₂[Fe(CN)₅NO]·2D₂O. It is shown that the metastable state SI corresponds to a linkage isomer of the NO group, the so-called isonitrosyl configuration where the NO ligand is oxygen bound to the central iron atom.