Solvothermal syntheses, crystal structures and luminescent properties of two new aromatic dicarboxylate indium coordination polymers

Two new indium coordination polymers formulated as [In(BPDA)(phen)Cl] _n (1) and [In(BDC)(HBDC)·2DMF]_n (2) (H ₂BPDA = 2,2′-biphenyldicarboxylic acid, C₁₄H ₁₀O₄; phen = 1,10-phenanthroline, C₁₂H ₈N₂; H₂BDC = 1,3-benzenedicarboxylic acid, C₈H₆O₄; DMF = N,N-dimethylformamide, C ₃H₇NO) have been synthesized under solvothermal conditions and characterized by single-crystal X-ray diffraction, infrared (IR), thermal gravimetric analyses (TG) and luminescent studies. Molecular structural analyses reveal that complex 1 exhibits an indium-2,2′-biphenyldicarboxylate helical chained structure decorated with 1,10-phenanthroline, and complex 2 possesses a two-dimensional (2D) layered structure constructed by 1,3-benzenedicarboxylate ligands and InO₆ octahedra, which has a (4,4) topological structure. Blue-green emission at 480 nm (λ _ex = 340 nm) for 1, intense blue-green emission at 492 nm, green emission at 535 nm, and yellow-green emission at 576 nm (λ_ex = 340 nm) for 2 are observed in the solid state at room temperature.