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Two Ni-substituted polyoxometalates (NiSPs), Ni6 (Py) 6 (H2O) 5 (μ3-OH) 3 (PW9O34) 2·10H2O (1), Ni7 (Py) 6 (Im) (H2O) 5O (WO4) (μ3-OH) 3 (H2PW9O34) ·3H2O (2) (Py = pyridine, Im = imidazole), were successfully hydrothermally synthesized. Compounds 1 and 2 have significantly different configurations by introducing different amounts of imidazole ligands. For compound 1, two malposed Ni6 (Py) 6PW9 units that are face to face are bridged by two Ni-O-W bonds to constitute an isolated dimeric structure. Differently, the Ni7 (Py) 6 (Im) PW92 dimer in compound 2 connects with four adjacent dimers by four WO4 groups in an interesting two-dimensional (2-D) arrangement. The magnetism of compounds 1 and 2 was studied, and magnetic test results demonstrated that both compounds have ferromagnetic interactions between the nickel centers. Meanwhile, the third-order nonlinear optical (NLO) measurements indicated that compound 1 can serve as potential nonlinear optical materials.
Wang et al. (Tue,) studied this question.