Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.



Hydrothermal generation, structural versatility and properties of metal(II)-organic architectures driven by a pyridine-tricarboxylic acid

Abstract

An aromatic tricarboxylic acid, 4-(6-carboxy-pyridin-3-yl)-isophthalic acid (H3cpia), was applied as a building block for the hydrothermal syntheses of a new series of twelve metal(II) (M = Mn, Co, Ni, Zn, Cd, Pb) coordination compounds, namely [Mn(H2cpia)2(H2O)2] (1), [M(Hcpia)(phen)(H2O)2] (M = Co, 2; Ni, 3; Zn, 4), [Zn(Hcpia)(2,2′-bipy)(H2O)2]5·4H2O (5), [Zn2(μ-Hcpia)2(2,2′-bipy)2] (6), [M(μ-Hcpia)(phen)(H2O)]n (M = Co, 7; Cd, 8), {[Pb(µ4-Hcpia)]·2H2O}n (9), [Cd4(µ3-cpia)2Cl2(phen)6(H2O)2]·10H2O (10), {[Zn3(µ3-cpia)2(phen)3]·10H2O}n (11), and {[Zn4(µ4-cpia)2(µ-OH)2(µ-4,4′-bipy)2]·4,4′-bipy·2H2O}n (12). These products were assembled from aqueous mixtures containing metal(II) chlorides, H3cpia as a main tricarboxylic acid block, sodium hydroxide and an optional N-donor crystallization mediator (i.e., 1,10-phenanthroline, phen; 2,2′-bipyridine, 2,2′-bipy; or 4,4′-bipyridine, 4,4′-bipy). Compounds 1–12 were fully characterized by standard solid-state methods (IR spectroscopy, elemental analysis, TGA, PXRD, and single-crystal X-ray diffraction). Their structures range from discrete 0D monomers (1–5), dimer (6) or tetramer (10) to 1D coordination polymers (7, 8, and 11) and 2D metal-organic layers (9 and 12). Structural and topological features of H-bonded and metal-organic architectures were highlighted, showing that the structural diversity of 1–12 is influenced by the type of metal(II) node, the level of deprotonation of H3cpia, reaction temperature, and presence of crystallization mediator. Thermal behavior, magnetic, luminescent and photocatalytic properties of selected compounds were investigated and discussed. In fact, cobalt(II) coordination polymer 7 acts as a stable and recycable photocatalyst for the oxidative UV-light-assisted degradation of an organic dye in aqueous medium; methylene blue was used as a model dye pollutant in waste water. Finally, the obtained products 2 and 4−12 represent the first examples of Co, Zn, Cd, and Pb coordination compounds derived from H3cpia, thus introducing its application as a multifunctional picolinate-isophthalate building block for the generation of metal-organic architectures.

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Mar 2019, accepted on 13 May 2019 and first published on 13 May 2019


Article type: Paper
DOI: 10.1039/C9DT01253B
Dalton Trans., 2019, Accepted Manuscript

  •   Request permissions

    Hydrothermal generation, structural versatility and properties of metal(II)-organic architectures driven by a pyridine-tricarboxylic acid

    N. Zhao, Y. Li, J. Gu, M. Kirillova and A. M. Kirillov, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT01253B

Search articles by author

Spotlight

Advertisements