Three different tetrazole‐carboxylate ligands, Hpymtza, Hpytza, and H2dtzeda were chosen to be reacted with Ca(NO3)2·4H2O, resulting in the formation of three coordination compounds, [Ca(pymtza)2(H2O)4] (1), [Ca(pytza)2(H2O)2] (2), and [Ca(dtzeda)(H2O)2] (3) [Hpymtza = 5‐(2‐pyrimidyl)tetrazole‐1‐acetic acid, Hpytza = 5‐(3‐pyridyl)tetrazole‐2‐acetic acid, and H2dtzeda = 1, 2‐bis(tetrazol‐5‐yl)ethane‐N1, N1′‐diacetic acid]. X‐ray diffraction analysis revealed that compound 1 displays a mononuclear structure, compound 2 is a one dimensional zigzag chain structure, whereas 3 shows a three‐dimensional structure. The structures were controlled by not only the different substituents of the tetrazolyl ring, but also the complementary hydrogen bonds. Furthermore, the luminescence properties of compounds 1–3 were investigated at room temperature in the solid state. These emissions can be tentatively attributed to the ligand centered emission.
Two novel coordination compounds, namely, [Sm2(pypza)2(H2O)10]Cl4·H2O (1) and [Eu(pypza)(C2O4)] (2), where pypza = 3-(2-pyridyl)-1-pyrazolyl acetato, have been synthesized under hydrothermal conditions. These compounds were characterized by elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction. The X-ray diffraction analysis reveals that compound 1 displays double one-dimensional chains, whereas 2 shows a two-dimensional layer structure via the bridging pypza and oxalate (C2O42–) which may arise from the oxidation of hydroacetic acid through the decomposition and hydrolysis of Hpypza by means of the cleavage of the C–N bond between the carboxylate group and the pyrazolyl ring. Compounds 1 and 2 show three-dimensional networks by hydrogen bonding interactions. Furthermore, the luminescence properties of 1 and 2 have also been investigated at room temperature in the solid state.
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