Two Ni-substituted polyoxometalates (NiSPs), [Ni 6 (Py) 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 {Ni 6 (Py) 6 PW 9 } units that are face to face are bridged by two Ni−O−W bonds to constitute an isolated dimeric structure. Differently, the {Ni 7 (Py) 6 (Im)PW 9 } 2 dimer in compound 2 connects with four adjacent dimers by four {WO 4 } 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.

Two captivating {P4Mo6}-based compounds, formulated as (H2bbi)2{[Co2(bbi)][Co(H2O)2]2[Co(H5P4Mo6O31)2]}·4H2O (1) and (H2bbi){[Zn(Hbbi)]2[Zn(bbi)][K2Zn(H2O)4][Zn(H4P4Mo6O31)2]} (2) [bbi = 1,1'-(1,4-butanediyl)bis(imidazole)] were successfully synthesized under hydrothermal conditions. Structural analysis demonstrates that compounds 1 and 2 are constructed...

Two new polyoxometalate (POM)-based hybrid compounds modified by a Schiff base, [Fe-(DAPSC)(H 2 O) 2 ] 2 [HPMo 2 V Mo 10 VI O 40 ] • 5H 2 O (1) and [Fe(DAPSC)(H 2 O)] 2 [HPV 3 IV Mo 4 V Mo 7 VI O 42 ] • 6H 2 O (2), (DAPSC = 2,6diacetylpyridine bis-(semicarbazone)), have been successfully constructed from typical Keggin POMs, iron ions, and DAPSC ligands under hydrothermal condition. Structural analysis demonstrates that the Fe-Schiff base ligand units are free from polyacid anions in compound 1. While in compound 2, the Fe-Schiff base ligand units are bridged with polyacid anions via FeÀ O bonds to emerge a stable double-supported skeleton. Noticeably, owing to the introduction of vanadium in H 5 PMo 10 V 2 O 40 • 32.5H 2 O, a divanadium-capped configuration is shaped in compound 2. Besides, the third-order nonlinear optical (NLO) properties of two compounds were explored. It should be noted that both compounds 1 and 2 have twophoton absorption properties, which indicates that the two compounds are potential nonlinear optical materials.

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Two heterometallic cluster {Ln8Cr4} were constructed from two classical “drum-like” {Ln4Cr2} building units associated by organic ligands HIN, displaying 1D wave chain structure. The MCE values for {Gd8Cr4} at 3 K and 7 T is 23.40 J kg−1 K−1.