Syntheses, Crystal Structures, and Catalytic Properties of Three Cu(II) and Cobalt(II) Coordination Compounds Based on an Ether-Bridged Tetracarboxylic Acid

Abstract

Three new products, [Cu2(μ3-dppa)(2,2′-bipy)2(H2O)]n·2nH2O (1), [Co4(μ4-dppa)2(phen)4(H2O)4]·2H2O (2), and [Co2(μ6-dppa)(μ-4,4′-bipy)(H2O)2]n·3nH2O (3) were synthesized using a hydrothermal method from Cu(II) and Co(II) metal(II) chlorides, 3-(3,4-dicarboxyphenoxy)phthalic acid (H4dppa), and different auxiliary ligands, namely 2,2′-bipyridine (2,2′-bipy),1,10-phenanthroline (phen), and 4,4′-bipyridine (4,4′-bipy). Products 1–3 were characterized by elemental analysis, FTIR, TGA, PXRD, SEM, and single-crystal X-ray crystallography. The structure of 1 features a 1D chain of the 2C1 topological type. Compound 2 shows a discrete tetrameric complex. Product 3 demonstrates a 3D metal–organic framework (MOF) with the new topology. Their structure and topology, thermal stability, and catalytic activity were studied. In particular, excellent catalytic activity was demonstrated for copper(II)-polymer 1 in the cyanosilylation reaction at 35 °C.

Structural Diversity and Catalytic Properties of Coordination Polymers with Functionalized Naphthalene Dicarboxylate Linkers

“…This may be explained by the existence of Co 2+ /Mn 2+ /Zn 2+ with unsaturated coordination sites. 26,38,53 The catalytic efficiency of polymers 7−10 is comparable to or even surpasses that of other heterogeneous catalytic systems based on metal-carboxylate coordination compounds (Table S9). 40,58−62 For 7, chemical stability tests were carried out by soaking the samples in various solvents (water, C 2 H 5 OH, CH 3 CN, and CHCl 3 ) for 24 h (70 °C).…”

“…It finds numerous applications in synthesizing key compounds, such as drugs 34,35 and fragrances. 36,37 Continuing our ongoing investigation into the use of commercially available carboxylic acids as linkers for designing functional coordination polymers, 21,26,38,39 herein we are assessing the potential of H 2 anda (4-aminonaphthalene-2,6dicarboxylic acid) as an amino-functionalized naphthalene dicarboxylate linker for the construction of novel coordination polymers (CPs). However, several factors led to the selection of H 2 anda: First, its structure contains five potential coordination sites, comprising four carboxylate O donors and one amino N donor, thus offering a wide array of possible coordination modes.…”