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Temperature-stimulated stable Ln(III)-based complexes (Ln-CPs) have been obtained through solvothermal method, the change of ligand coordination mode through the subtle change of reaction temperature leads to the transformation of the structure of complexes from zero-dimensional mononuclear to two-dimensional heptanuclear. The magnetic properties of complexes (1 , 2, 5, 6, 7, and 8) were studied in detail. • Lanthanide complexes based on the linear bifunctional ligand. • Structural analysis of of all complexes. • Magnetic properties of complexes (1 , 2, 5, 6, 7 and 8). Two kinds of lanthanide(Ш) complexes based on 2-(4-(1 H -imidazol-1-yl)phenyl)-1 H -benzo d imidazole-5-carboxylic acid (H 2 L) ligand, [Ln(H L) 2 (H 2 O) 4 (Cl) 4 ·2H 2 O (Ln = Ho, 1 ; Dy, 2), [Ln(H L) 2 (H 2 O) 4 OH·3H 2 O (Ln = Sm, 3 ; Tb, 4), [Pr(H L) 2 (NO 3)(H 2 O) 3 NO 3 ·4H 2 O (5), {[Gd 7 (H L) 9 (μ 3 -OH) 8 (H 2 O) 6 (Cl) 2 (OH) 2 ·4.5H 2 O} n (6) and {[Ln 7 (H L) 9 (μ 3 -OH) 8 (H 2 O) 6 (OH) 4 ·4.5H 2 O} n (Ln = Ho, 7 ; Dy, 8 ; Er, 9) were solvothermally synthesized by stimulating temperature conditions. The single-crystal structure analysis reveal that 1–5 exhibit distinct mononuclear structure, and the structure of 6 – 9 can be described directly as 2D coordination polymers constructed from heptanuclear nodes, and the 2D heptanulear cluster layer has a thickness of 10.98 Å along b axis, which can be further stacked together by intermolecular O6 – H6B∙∙∙N5 hydrogen bonds to obtain a 3D supramolecular structure with a diameter about 15.23 Å along c axis. Obviously, the change of ligand coordination mode through the subtle change of reaction temperature leads to the transformation of the structure of complexes from zero-dimensional mononuclear to two-dimensional heptanuclear. The magnetic properties of complexes (1 , 2 , 5 , 6 , 7 and 8) were studied. [ABSTRACT FROM AUTHOR]

Four new coordination polymers based on heterocyclic nitrogen and aromatic carboxylic acids have been hydro-/solvothermally prepared and further characterized. Magnetic tests show that 1 – 3 presence the antiferromagnetic behavior, while 4 shows a ferrimagnetic behavior. The electrochemical measurements show that 3 retains about 91.1% of original capacitance after cycling 10,000 times at 3 A g−1. • Coordination Polymers Constructed with Heterocyclic Nitrogen Ligands. • Structural analysis of all complexes. • Magnetic properties of complexes 1 – 3. Four new coordination polymers based on heterocyclic nitrogen and aromatic carboxylic acids, namely [Co(L1)(2,5-TDC)(H 2 O)] n (1), [Co(L1)(1,3-BDC)] n (2), [Cu(L2)(1,4-NDC)] n (3), and [Mn(L2) 2 (2-AIOC)(H 2 O)] n (4) [ L1 = 3,6-bis(1 H -imidazol-1-yl)pyridazine, L2 = 3,6-bis(1 H -benzo[ d ]imidazol-1-yl) pyridazine, 1,2-H 2 TDC = 2,5-thiophenedicarboxylic acid, 1,3-H 2 BDC = benzenedicarboxylic acid, 1,4-H 2 NDC = 1,4-naphthalenedicarboxylic acid, 2-H 2 AIOC = 2-aminoterephthalic acid] have been hydro-/solvothermally prepared and further characterized. 1 and 2 show 2D plane structure which belong to typical sql and sp topological net, respectively. 3 is a six-connected 3D framework with a pcu topological net and 4 belongs to a 3D supramolecular structure constructed via hydrogen bonds. Magnetic tests revealed that 1 – 3 presence the antiferromagnetic behavior, while 4 displays a ferrimagnetic behavior. The electrochemical measurements explained that 3 possesses excellent cycling stability that it can retain about 91.1% of original capacitance after cycling 10,000 times at 3 A g−1 in 2 mol L−1 KOH aqueous electrolyte. [ABSTRACT FROM AUTHOR]

Lanthanide coordination polymers have been successfully assembled by Ln3+ ions and asymmetric carboxylic acid ligand under solvothermal conditions. The structure analysis display that complexes 1 – 3 are isostructural three-dimensional (3D) supramolecular network. Furthermore, luminescence properties of complexes 1 – 4 have been measured in the solid state at room temperature. Complex 2 exhibits a strong red luminescence upon excitation at 283 nm and its lifetimes is 33.554 ns. In addition, magnetic studies reveal that complex 1 has a weak antiferromagnetic interaction. Lanthanide coordination polymers (Ln-CPs) {[Ln(H L) 2 (H 2 O) 3 ]·(H 2 O) 4 ·Cl} n (Ln = Dy, 1 ; Eu, 2 ; Sm, 3) and [Ln 0.18 (H L) 0.18 (CH 3 COO) 0.36 (H 2 O) 0.54 ] n (Ln = La, 4 ; H 2 L = 2-(hydroxymethyl)-1 H -benzo[ d ]imidazole-5-carboxylic acid) have been successfully assembled by Ln3+ ions and asymmetric carboxylic acid ligand under solvothermal conditions. The structures of the complexes 1 – 4 were determined by single crystal X-ray diffraction and further characterized by elemental analyses, IR spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA). The structure analysis display that complexes 1 – 3 are isostructural three-dimensional (3D) supramolecular network. Complexes 1 – 4 were constructed by hydrogen bonding interactions between the coordinated water molecules and the O atoms of the hydroxy group or free chloride ions. Furthermore, luminescence properties of complexes 1 – 4 have been measured in the solid state at room temperature. Complex 2 exhibits a strong red luminescence upon excitation at 283 nm and its lifetimes is 33.554 ns. In addition, magnetic studies reveal that complex 1 has a weak antiferromagnetic interaction. [ABSTRACT FROM AUTHOR]