Nine novel coordination polymers (CPs) with the formulas [M 6 (TDA) 9 (DEF) 5 (H 2 O) 3 ] n [M = Ce (1), Pr (2), Nd (3), Sm (4)], [Eu 4 (TDA) 6 9) (TDA = 2,5-thiophenedicarboxylate anion and DEF = diethylformamide) have been synthesized at different temperatures in a DEF-H 2 O solvent system under solvothermal conditions. All the compounds were characterized by single crystal X-ray diffraction analysis (XRD), Fourier transformation vibrational spectroscopy (FT-IR) and thermal analysis (TGA). Structural analyses of CPs 1-4 reveal that the polymers crystallize in the orthorhombic space group Pna2 1 and form 3D frameworks with large volumes 10 378.1(5), 10 230.5(5), 10 171.9(5) and 10 077.1(11) Å 3 , respectively. The M(III) ions of CPs 1-4 exhibit nine and eight coordination numbers with diverse geometries. Structural analyses of CPs 5 and 6-9 unveil that the polymers crystallize in the monoclinic system, with space groups P2 1 and P2/c, respectively, forming a 3D network. The TDA ligand exhibits two coordination modes [(κ 1 -κ 1 )-(κ 1 -κ 1 )-μ 4 and (κ 2 -κ 1 -μ 2 )-(κ 1 -κ 1 )-μ 5 ] which interconnect the metal ions to generate 3D novel metalorganic frameworks. The luminescence properties of 4, 5, 7 and 8, and the magnetic properties of 6-8 were investigated.

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Ten isomorphous coordination polymers (CPs) with the formula [Ln2(ATPA)3(DEF)2]n Ln=Ce (1), Pr(2), Nd (3), Eu (5), Gd (6) and [Ln(ATPA)1.5(DEF)]n Ln=Sm (4), Tb (7), Dy (8), Ho (9) and Y(10) (H2ATPA=2‐aminoterepthalic acid and DEF=diethyl formamide) have been synthesized by the self assembly of Ln(III) ions, 2‐aminoterepthalate and DEF under solvothermal condition. These polymers have been systematically characterized by single‐crystal X‐ray diffraction, FTIR, PXRD, thermogravimetric (TGA) and elemental analyses. Structure analyses of CPs 1–10 reveal that all CPs crystallize in the monoclinic space group C2/c system and form 3D framework with difference in coordination numbers. The CPs 1 & 2 exhibit eight coordination numbers whereas CPs 3–10 show seven coordination number with different geometries. TGA indicate thermal stability and robustness of the synthesized CPs. The Sm (4), Eu (5), Tb (7) and Dy (8) polymers emit strong ligand sensitized characteristic f‐f luminescence. Analyses of magnetic susceptibility data of CPs 4, 6, 7 & 8 at variable temperatures and applied magnetic fields reveal weak ferromagnetic interactions at low temperatures.

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A 1D coordination polymer [Nd 3 (INA) 9 (H 2 O) 6 ] n (I) and a dimeric complex with mononuclear asymmetric unit [Nd(NA) 3 (H 2 O) 2 ] (II) (HINA = isonicotinic acid and HNA = nicotinic acid) were synthe sized. The compounds were characterized by elemental analyses, infrared spectroscopy and single crystal X ray diffraction studies (CIF file CCDC nos. 938976 (I) and 939061 (II). X ray crystal structure analysis reveals that both compounds exhibit rich structural chemistry. Compounds I and II belong to the monoclinic system with space group P2 1 /c. Thermogravimetric analysis has been performed to investigate their thermal stability. The coordination polymer I has meso porous structure with average diameter of pores (~4 nm) and BET surface area 13.62 m 2 /g.