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Two types of copper-lanthanide heterometallic coordination polymers (CPs) [Ln2Cu3(2,3-pydc)6(H2O)6]·xH2O [Ln = La (1, x = 8), Nd (3, x = 10), 2,3-H2pydc = pyridine-2,3-dicarboxylic acid] and [Ln2Cu2(2,3-pydc)4(NO3)(OH)(H2O)6]·2H2O [Ln = La (2), Nd (4)] were successfully synthesized by one-pot reaction under hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction. CPs 1–4 exhibit two kinds of three-dimensional (3D) structures with different topologies. In 1 and 3, the Cu(2,3-pydc)2 and Ln2(COO)4 units link each other to form a two-dimensional (2D) layer, and the adjacent 2D layers are extended by the Cu(2,3-pydc)4 units into a 3D framework with one-dimensional (1D) channels. In 2 and 4, the LnIII ions bridge the 1D chains based on 2,3-pydc and CuII into a 2D layer, and the nitrate and hydroxyl anions connect the adjacent 2D layers to generate a 3D framework with 1D channels. The electrochemical properties of 1–4 were studied. [ABSTRACT FROM AUTHOR]

Abstract A three-dimensional (3D) coordination polymer (CP) constructed from the linear trinuclear Co(II) cluster and 3,5-bis(4-carboxyphenyl)pyridine (H 2 bcpp), Co 3 (bcpp) 2 (HCOO) 2 (H 2 O) 2 (1), has been synthesized under solvothermal condition of H 2 O-DMF (DMF = N , N -dimethylformamide) and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). In 1 , the COO groups from the bcpp and HCOO anions bridge the Co(II) ions to form a linear trinuclear Co 3 (COO) 6 cluster. The linear trinuclear Co 3 (COO) 6 clusters are linked by the bcpp anions into a 3D CP with a 3,6-connected (4·82) 2 (42·812·10) topology. The HCOO anion is derived from the decomposition of DMF under solvothermal condition. The introduction and decomposition of DMF plays an important role in the formation of 1. In addition, the photoluminescent and magnetic properties of 1 have been investigated. Graphical abstract A three-dimensional linear trinuclear Co(II) cluster-based coordination polymer has been successfully constructed under solvothermal condition. The coordination polymer can be considered as a bifunctional material combining photoluminescent and magnetic properties. Image 1 Highlights • A 3D linear trinuclear Co(II) cluster-based coordination polymer 1 is obtained under solvothermal condition of H 2 O-DMF. • The introduction and decomposition of DMF plays an important role in the formation of 1. • Coordination polymer 1 displays the photoluminescent and magnetic properties. [ABSTRACT FROM AUTHOR]

A series of linear CoII 2 LnIII 2 clusters derived from 3,4-dichlorobenzoate and 2,2′-bipyridine have been successfully synthesized and structurally characterized. Their photoluminescent and magnetic properties have been investigated. • Seven CoII-LnIII heteromatellic complexes are obtained. • The corresponding EuIII and TbIII complexes exhibit characteristic photoluminescent properties. • The corresponding DyIII complex shows a field-induced slow magnetic relaxation behavior. The reactions of Co(NO 3) 2 ·6H 2 O, Ln(NO 3) 3 · n H 2 O, 3,4-dichlorobenzoic acid (3,4-HDCB), 2,2′-bipyridine (2,2′-bpy), and NaOH under solvothermal conditions of H 2 O and ethanol yielded a series of 3d-4f heterometallic complexes [Ln 2 Co 2 (3,4-DCB) 10 (2,2′-bpy) 2 ] [Ln = Nd (1), Sm (2), Eu (3), Gd (4), Tb (5), Dy (6), and Er (7)]. Complexes 1 – 7 are isostructural except that the coordination number of LnIII in 1 – 6 is different from that in 7. This is related to the size of the LnIII ions. Complexes 1 – 7 possess linear tetranuclear CoII-LnIII-LnIII-CoII cluster structures formed by the 3,4-DCB anions bridging the CoII and LnIII ions. The thermal stability as well as the photoluminescent and magnetic properties of 1 – 7 were investigated. [ABSTRACT FROM AUTHOR]