Three-dimensional Coordination Compound Research Articles

A zinc coordination compound showing green photoluminescence

Abstract A novel three-dimensional coordination compound has been solvothermally synthesized based on a tetracarboxylate ligand H4L (H4L = 1,3,6,8-tetrakis(4-carboxylphenyl)pyrene), Zn2L(H2O)2·2DEF (1) (DEF = N,N′-diethylformamide). Each Zn ion is coordinated by four carboxylate oxygen atoms from four L4− ligands and one oxygen atom from a water molecule to provide a distorted square-pyramidal geometry. Pairs of adjacent Zn cations are bridged by four carboxylate groups of four different L4− ligands to generate a paddle-wheel [Zn2(COO)4(H2O)2] secondary building unit (SBU). Each SUB is further linked to four L4− ligands to give a three-dimensional framework with cds-type (CdSO4-type) topology. The crystal structure has been determined via single-crystal X-ray diffraction, and the compound was characterized by elemental and thermal analysis, infrared spectroscopy, powder X-ray diffraction, and solid-state photoluminescence measurements.

Hydrothermal synthesis, crystal structure and properties of two new coordination polymers structured by two mixed ligands and strict quadrangular {Ln3}8 Units (Ln=Er and Ho)

Abstract Two new three-dimensional coordination compounds formulated as [Ln3(IN)2(bdc)3.5(H2O)3]·0.5H2O (Ln = Er 1, Ho 2), where HIN = isonicotinic acid and H2bdc = 1,4-benzenedicarboxylic, have been obtained by hydrothermal assemble of Ln2O3 (Ln = Er 1, Ho 2), HIN and H2bdc. Structural analysis shows that Ln3+ ions are connected by both ligands IN− and bdc2 − in 1 and 2. IN− links two adjacent {Ln3} units along b axis, while bdc2 − connects eight {Ln3} units along different directions, which leads to an interesting strict {Ln3}8 quadrangular in 3D open frameworks of 1 and 2.

Sonochemical Synthesis and Characterization of A Nano-Rod Lead(II) Supramolecular, Three Dimensional Coordination Compound: New Precursor to Produce Pure Phase Nano-Sized Lead(II) Oxide

Nanorods of a lead(II) supramolecular three-dimensional (3D) coordination compound, [Pb(tfpb)2]n (1) (Htfpb = 4,4,4-trifluoro-1-phenyl-1,3-butanedione), was prepared by the sonochemical method. The new nano-structure was characterized by scanning electron microscopy, X-ray powder diffraction, elemental analyses and IR spectroscopy. A single-crystal structure of the compound showed that the coordination number of Pb(II) is eight with six O-donor atoms from the tfpb ligand and two F-donors from anionic ligands. The 3D supramolecular structure of 1 is realized by weak directional C–F···F–C and π–π stacking interactions. After calcination of nano-sized 1 at 500 °C, pure phase nano-sized lead(II) oxide is produced.