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- W2065019123 abstract "The results of 237Np-Mössbauer and magnetic study on neptunyl (+1, +2) (Np(V, VI); 5f2,1) complexes are discussed, focusing on their unique neptunyl (ONp(V, VI)O)+1,+2-based low-dimensional (low-D) molecular magnetism in correlation with their structural details (the individual ‘nyl’-based uniaxial molecular structure, its dimensionality extended by the so-called ‘cation–cation bond’ (CCB), and their differences between the neptunyls (+1) and (+2), etc.). For this purpose, first, the X-ray diffraction (XRD) and 237Np-Mössbauer data on their basic structural and electronic (hyperfine electric-quadrupole and magnetic) properties are described. On this basis, magnetic properties of over-10 oxo-neptunyl (+1) complexes are discussed and summarized, revealing several salient structure–magnetic property correlations in these systems such as the crucial role of 2D-CCB network structure for the onset of long-range magnetic order. As for the neptunyl (+2) complexes for which magnetic data are very sparse, the results of our most-recent study on the three systems, an oxo-trinitrato 1 NH4[NpO2(NO3)2] and two pyridine (py = C5H5N) complexes, 2 NpO2(acac)2py (acac = C5H7O2−) and 3 NpO2(NO3)2byp (bpy (bipyridine) = C10H8N2), are presented. Here, due to the higher (+2) neptunyl valence state, the CCB is not generally formed, and all these three are nominally the 0D non-CCB systems. Oxo-1 was found to be a Curie–Weiss paramagnet down to 2 K, similar to the formerly reported oxo-neptunyl (+2) 4 NaNpO2(CH3COO)3. While, the N-substituted 2 and 3 are found to exhibit strikingly different magnetic features from the above oxo-neptunyls (+1, +2), such as strongly field (H)-dependent peculiar non-paramagnetic behavior up to 300 K for the both, and anomalous magnetic-relaxation (creep) behavior at low temperature for 2, etc. Possible origin and implication of such anomalous magnetic features of 2 and 3 are argued based on the extensive magnetic data collected for over the past 1 year." @default.
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- W2065019123 date "2007-10-01" @default.
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- W2065019123 title "Molecular magnetism in neptunyl (+1, +2) complexes: 237Np-Mössbauer and magnetic study" @default.
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- W2065019123 doi "https://doi.org/10.1016/j.jallcom.2006.12.062" @default.
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