Abstract
Based on tetradentate metalloligand LCu ([Cu(2,4-pydca)2], 2,4-pydca = pyridine-2,4-dicarboxylate) and lanthanides (Sm3+, Dy3+), two 3d-4fheterometalliccoordination polymers, namely, {[Sm2 (DMSO)4 (CH3OH) 2][LCu]3·7DMSO·2CH3OH}n 1 and {[Dy2 (DMSO)3 (CH3OH)][LCu3 (DMSO)]·4DMSO·CH3OH}n 2 (DMSO = dimethyl sulfoxide), have been synthesized and well characterized by elemental analysis, Fourier-transform infrared spectroscopy, thermogravimetric and single-crystal X-ray diffraction analysis. Single-crystal X-ray analysis reveals that both 1 and 2 crystallize in the triclinic crystal system with P-1 space group and possess the 3D framework structures, which are constructed from metalloligands LCu connecting with {Sm2} and {Dy2} clusters, respectively. The 3D structure of 1 has a 6-connected single-nodal topology with the point symbol {49 × 66}, while 2 features a different framework with the point symbol of {412 × 63}. Thermogravimetric analysis exhibits that the skeleton of both 1 and 2 collapse after 350℃. Magnetic properties of 1 and 2 have also been investigated.
Highlights
Among various approaches to the construction of heterometallic coordination polymers (CPs), the most efficient one is to employ metalloligands that can connect with other metal centers, such as transition metal [6] [7] [8] and lanthanide ions [9]-[16]
According to the molecular formula of CP-2, which has been determined definitively from the crystal structure, one of the metalloligand LCu was changed into LCu (DMSO) during the reaction process.Further, the Thermogravimetric analysis (TGA) behaviors of two CPs have been measured in the temperature range of 25 ̊C - 800 ̊C, while the magnetic properties of 1 and 2 have been investigated
Our synthetic strategy uses dimethyl sulfoxide solution (DMSO) as the buffer solution, which can slow the interactions between LCu and lanthanide ions
Summary
Current interest in these materials mainly focuses on the coordination polymers (CPs) associated with mixed-metal ions [5]. According to the molecular formula of CP-2, which has been determined definitively from the crystal structure, one of the metalloligand LCu was changed into LCu (DMSO) during the reaction process.Further, the TGA behaviors of two CPs have been measured in the temperature range of 25 ̊C - 800 ̊C, while the magnetic properties of 1 and 2 have been investigated
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