Multifunctional Cobalt(II) Coordination Polymers Tuned by Flexible Bis(pyridylamide) Ligands with Different Spacers and Polycarboxylates

Abstract

Ten multifunctional cobalt(II) coordination polymers with the formulas of [Co(L 1 )0.5(5-AIP)]­·H2O (1), [Co(L 2 )­(5-AIP)­(H2O)2] (2), [Co(L 3 )0.5­(5-AIP)] (3), [Co(L 4 )0.5­(5-AIP)­(H2O)]­·2H2O (4), [Co(L 5 )­(5-AIP)] (5), [Co(HBTC)­(L 3 )]­·H2O (6), [Co(HBTC)­(L 6 )­(H2O)]­·3H2O (7), [Co(L 2 )­(1,3-BDC)­(H2O)2] (8), [Co2(L 3 )2­(1,3-BDC)2]­·4H2O (9), and [Co2(L 4 )1.5­(1,2-BDC)­(μ2-OH)­(μ3-OH)­(H2O)]­·H2O (10) have been prepared by a hydrothermal technique employing six flexible bis(pyridylamide) ligands with different spacers (L 1 = N,N′-bis(3-pyridyl)­oxamide, L 2 = N,N′-bis(3-pyridyl)­malonamide, L 3 = N,N′-di(3-pyridyl)­succinamide, L 4 = N,N′-bis(3-pyridyl)­adipamide, L 5 = N,N′-bis(3-pyridyl)­heptandiamide, L 6 = N ,N′-bis(3-pyridyl)­sebacicdiamide) and four aromatic polycarboxylic acids mixed ligands (5-H2AIP = 5-aminoisophthalic acid, H3BTC = 1,3,5-benzenetricarboxylic acid, 1,3-H2BDC = 1,3-benzenedicarboxylic acid, and 1,2-H2BDC = 1,2-benzenedicarboxylic acid). Compound 1 exhibits a two-dimensional (2D) double-layer network. Compounds 2 and 8 are isostructural and possess one-dimensional (1D) circle-connecting-circle chain structures derived from 1D [Co(L 2 )] n “Ω”-like chain and 1D [Co(5-AIP)] n ­/[Co(1,3-BDC)] n wavelike chain. Compound 3 possesses a 3,8-connected three-dimensional (3D) coordination framework with {42.6}2­{44.610.79.85} topology. Compound 4 is a 2D network containing a ladder-like chain. Compound 5 reveals a novel 3-fold interpenetrating CdSO4-like framework. Compound 6 is a double-layer coordination network with a (3,5)-connected {42·67·8}{42·6} topology. Complex 7 shows a 2D (4,4) grid layer. Compound 9 features a 2-fold interpenetrating 3D α-Po-related topological framework. Compound 10 is a 6-connected 3D coordination polymer with a {412.63} topology. The spacer length of the bis(pyridylamide) ligands, as well as the substituent group and carboxyl group number of polycarboxylates, shows a significant effect on the ultimate architectures of various cobalt(II) compounds 1–10. The electrochemical behaviors of carbon paste electrodes (CPEs) bulk-modified by compounds 1–10 and the electrocatalytic activities of 1-, 6-, 9-, 10-CPEs have been investigated. The photocatalytic properties of compounds 1–10 toward the degradation of methylene blue (MB) in visible light irradiation have been investigated. The variable temperature magnetic susceptibilities for compounds 3, 5, 9, and 10 indicate the existence of antiferromagnetic exchange interactions.

Syntheses and Characterization of Three Coordination Polymers of Zinc(II) and Cadmium(II) with Dicarboxylates and Bis(thiabendazole) Ligands

“…In the IR spectra of complexes 1-3, no band in the region 1690-1730 cm -1 indicates complete deprotonation of the carboxylic groups [26]. The asymmetric and symmetric stretching vibrations of carboxylate groups are observed in the ranges of 1624-1560 cm -1 and 1488-1333 cm -1 , respectively and 3, respectively, being in agreement with their coordination modes [27]. The purity of complexes 1-3 is confirmed by X-ray power diffraction analyses, as shown in Fig.…”

Effect of three bis-pyridyl-bis-amide ligands with various spacers on the structural diversity of new multifunctional cobalt(II) coordination polymers

“…S12a and S13a show the cyclic voltammograms of 1-3-CPE at different scan rates, respectively. It can be seen that a reversible redox peak attributed to the redox of Co III /Co II is observed at the 1-3-CPE in the potential range of 500 to À 200 mV, 500 to À 300 mV, and 600 to À 200 mV, respectively [43,44]. The mean peak potentials E 1/2 ¼(E pa þE pc )/2 are þ127 mV for 1-CPE, þ32 mV for 2-CPE, and 110 mV for 3-CPE (120 mV s À 1 ), respectively.…”

Synthesis, Structures, and Photocatalytic Properties of Zinc(II) and Cobalt(II) Supramolecular Complexes Constructed with Flexible Bis(thiabendazole) and Dicarboxylate Linkers

“…[1][2][3][4][5][6] Apart from those classical catalysts, the exploitation of semiconductor photocatalysts based on coordination polymers (CPs), which can be used to decompose organic pollutants under UV/Vis light, has become one of the major green and high-efficient water treatment technologies for environmental remediation. [7][8][9][10] It is well known that photocatalysts with high specific surface area and appropriate bandgap can enrich adsorption of the dye on the catalyst and accelerate separation rate of photogenerated electron-hole pairs. [11][12][13] Although rapid progress in the construction of CPs has been made, it is still unpredictable to con-1 stacking interactions.…”