Two new pH-controlled coordination polymers constructed from an asymmetrical tricarboxylate ligand and Zn-based rod-shaped SBUs

https://doi.org/10.1016/j.inoche.2015.03.017Get rights and content

Highlights

  • Two rod packing coordination polymers were synthesized by controlling the amount of NaOH.

  • An unprecedented 1D rod-shaped Zn-chain based on Zn5(COO)6 units is first obtained.

  • In solid state, both complexes exhibit good emission at room temperature.

Abstract

Two new 3D coordination polymers, [Zn3(L)2(H2O)4]·H2O (1) and [Zn5(μ3-OH)4(L)2(H2O)2] (2) (H3L = 3-(2′,5′-dicarboxylphenyl)benzoic acid), have been synthesized under hydrothermal conditions by adding different amounts of NaOH. Structural analyses show that both of them contain 1D inorganic Zn(II)-chains as rod-shaped secondary building units (SBUs) but they are in different forms. The rod-shaped Zn(II)-chain of 1 is only Zn-carboxylate chain, while the one in 2 is formed by the independent Zn5(COO)6 clusters connected by hydroxyl oxygen. Furthermore, the thermal and luminescent properties of both compounds have been studied.

Graphical abstract

Two new coordination polymers based on two different rod-shaped SBUs have been synthesized by controlling the amount of NaOH added. Particularly, an unusual rod-shaped Zn-chain is formed by the independent Zn5(COO)6 clusters connected by OH groups. This work presents that NaOH not only regulates the pH but also can participate in coordination.

  1. Download : Download full-size image

Section snippets

Acknowledgments

We are grateful for financial support from the NSF of China (grants 21371142, 20931005, 91022004, 21201139), the NSF of Shaanxi, China (grant 2013JQ2016).

References (23)

  • J. Liu et al.

    Applications of metal–organic frameworks in heterogeneous supramolecular catalysis

    Chem. Soc. Rev.

    (2014)
  • Cited by (9)

    • Novel metal-organic and supramolecular 3D frameworks constructed from flexible biphenyl-2,5,3′-tricarboxylate blocks: Synthesis, structural features and properties

      2017, Journal of Molecular Structure
      Citation Excerpt :

      The six-coordinate Zn2 atom is surrounded by five carboxylate O atoms from three independent μ4-L3– blocks and one N atom from a μ-4,4′-bpy ligand, thus forming a distorted octahedral {ZnNO5} geometry. The ZnO [2.003(4)–2.570(4) Å] and ZnN [2.090(4)–2.092(6) Å] bond distances are in good agreement with those observed in some related Zn(II) compounds [18,20,22,23,28]. In 3, the L3− block acts as a μ4-spacer (Scheme 2, mode V), in which the three carboxylate groups show the terminal bidentate and μ-bridging tridentate modes.

    • Structural modulation and luminescent properties of four Cd<sup>II</sup> coordination architectures based on 3-(pyridin-4-yl)-5-(pyrazin-2-yl)-1H-1,2,4-triazole and flexible/rigid dicarboxylate ligands

      2016, Journal of Solid State Chemistry
      Citation Excerpt :

      It is because the CPs offer a degree of structure predictability, in addition to well-defined environments for luminophores in crystalline form. As everyone known, CPs display a wide range of luminescent behavior resulting from the multifaceted nature of their structure, and these structures are readily tunable through variation of the different ligands [18], metal ions [19], solvent [20], reaction temperature [21], pH [22] and so on [23–25]. Among these factors, the organic ligands, typically those with π-conjugated backbones influence profoundly the specific structures and luminescent properties of CPs.

    • A series of novel complexes derived from 4-(5-(pyridin-3-yl)-4H-1,2,4-triazol-3-yl) benzoic acid: Hydrothermal syntheses, crystal structures, and properties

      2016, Polyhedron
      Citation Excerpt :

      The Zn2–O distances fall in the range of 1.891(3)–1.929(3) Å, while the Zn2–N distances lengths vary from 2.035(4) to 2.048(4) Å, and the coordination angles around the Zn2 are in the range of 97.84(14)–130.10(15)° (Table 5). The Zn–N and Zn–O bond lengths and coordination angles around the Zn(II) are in the normal range [16–17]. The Zn(1)⋯Zn(2) distance is 3.1546(9) Å.

    • Design and synthesis of two luminescent Zn(II)-based coordination polymers with different structures regulated by different solvent system

      2016, Journal of Molecular Structure
      Citation Excerpt :

      So, tremendous efforts have been put into the elaboration of useful CPs by choosing the center metal ions or cluster nodes link with functionally valuable organic linkers [6–9]. A great number of CPs have also been proven that various key factors governing the diversity of CPs, such as metal-ligand ratio, pH, solvents, temperature, and so forth [10–15]. In particular, the nature of the solvent is an important factor among these factors because its chemical properties as well as structure can affect the rate of crystal growth and the final structures [16–20].

    View all citing articles on Scopus
    View full text