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) (H2BPDA = 2,2′-biphenyldicarboxylic acid, C14H10O4; phen = 1,10-phenanthroline, C12H8N2; H2BDC = 1,3-benzenedicarboxylic acid, C8H6O4; DMF = N,N-dimethylformamide, C3H7NO) 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 (λex = 340 nm) for 1, intense blue-green emission at 492 nm, green emission at 535 nm, and yellow-green emission at 576 nm (λex = 340 nm) for 2 are observed in the solid state at room temperature.