Crystal structure of a novel cadmium sulfate coordination polymer based on the multidentate 2-(3-(4-(pyridin-4-yl)phenyl)-1H-1,2,4-triazol-5-yl) pyridine ligand

Abstract

A novel metal-organic coordination polymer, namely [Cd 2 (Hpptpd) 2 (SO 4 ) 2 (H 2 O)] n (I) (Hpptpd = 2-(3-(4-(pyridin-4-yl)phenyl)-1H-1,2,4-triazol-5-yl)pyridine), is hydrothermally synthesized and characterized by elemental analysis, IR and X-ray single crystal diffraction. The X-ray diffraction analysis reveals that I crystallizes in the triclinic system, space group P-1 with a = 8.593(6) Å, b = 9.832(6) Å, c = 11.845(7) Å, α = 68.172(10)°, β = 88.002(12)°, γ = 84.916(11)°, V = 925.3(10) Å 3 , Z = 2. In I, the Cd(II) atom is heptacoordinated and displays a CdN 3 O 4 pentagonal bipyramidal geometry. A pair of head-to-tail arranged Hpptpd ligands with a chelating + bridging mode binds two Cd(II) ions to form a centrosymmetric [Cd 2 (Hpptpd) 2 ] subunit which is bridged by two centrosymmetric sulfate anions to form a zigzag chain. The interchain O water -H⋯O sulfate hydrogen bond extend the one-dimensional (1D) chain into a twodimensional (2D) supramolecular sheet incorporating centrosymmetric twelve-membered 4 4 R (12) hydrogen-bonding rings. The adjacent sheets further interdigitate with each other to form the resultant three-dimensional (3D) supramolecular framework by N Hpptpd -H⋯O sulfate hydrogen bonds and π⋯π stacking interactions.The design and synthesis of metal-organic coordination polymer, often referred to as metal-organic frameworks (MOFs), have attracted more attention not only because of their appealing structural and topological novelty but also owing to their tremendous potential applications in gas storage and separations [1, 2], heterogeneous catalysis [3], ion exchange [4], nonlinear optics [5], magnetism [6,7], and molecular recognition [8][9][10]. To the best of our knowledge, in the assembly process of MOFs, many factors can affect the final crystal structure, such as the structure of the organic ligand [11], the coordination geometry of the metal ion [12], the metal-ligand ratio, and so on. Secondary interactions such as hydrogen bonding, π⋯π stacking and host-guest interactions must also be considered. Recently less attention was given to the supramolecular architectures based on N-donor ligands, especially multidentate N-donor ligands [13]. Unlike the common bipyridine or biimidazole ligands [14], the multidentate N-donor ligands such as 3-(2-pyridyl)-5-(4-pyridyl)-1,2,4-triazole are

A Zn(II) Coordination Polymer for Fluorescent Turn-Off Selective Sensing of Heavy Metal Cation and Toxic Inorganic Anions

“…Some of them can only be utilized for the detection of a single analyte. For instance, a 2D Zn(II) CP [Zn(4-PP)(1,4-BDC)∙(H 2 O)] n (1,4-PP = 4-(1H-pyrazol-3-yl)pyridine, 1,4-H 2 BDC = 1,4-benzenedicarboxylic acid) synthesized under hydrothermal conditions exhibits selective and sensitive detection of Fe 3+ in water medium [ 29 ]. However, the title Zn(II) CP displays multi-functional fluorescence responses towards Fe 3+ , Cr 2 O 7 2− and MnO 4 − .…”

“…Figure 2. Fluorescence excitation and emission spectra of (a) free Hatyha ligand and (b) CP 1.Molecules 2024,29, 2943 …”