Abstract
Crystals of a new dimeric chloride-bridged cuprate(II) derived from pyridine-2,4-di-carb-oxy-lic acid were obtained solvothermally in the presence of piperazine and hydro-chloric acid. The crystal structure determination of the title salt, (C4H12N2)[Cu2(C7H4NO4)2Cl4], revealed one of the carboxyl groups of the original pyridine-2,4-di-carb-oxy-lic acid ligand to be protonated, whereas the other is deprotonated and binds together with the pyridine N atom to the CuII atom. The coordination environment of the CuII atom is distorted square-pyramidal. One of the chloride ligands bridges two metal cations to form a centrosymmetric dimer with two different Cu-Cl distances of 2.2632 (8) and 2.7853 (8) Å, whereby the longer distance is associated with the apical ligand. The remaining chloride ligand is terminal at one of the basal positions, with a distance of 2.2272 (9) Å. In the crystal, the dimers are linked by inter-molecular O-H⋯O hydrogen bonds, together with N-H⋯O and N-H⋯Cl inter-actions involving the centrosymmetric organic cation, into a three-dimensional supra-molecular network. Further but weaker C-H⋯O and C-H⋯Cl inter-actions consolidate the packing.
Highlights
Crystals of a new dimeric chloride-bridged cuprate(II) derived from pyridine2,4-dicarboxylic acid were obtained solvothermally in the presence of piperazine and hydrochloric acid
In the course of our investigations, we were interested in using pyridine-2,4-dicarboxylic acid as a source of N- and O-donors, in synthesizing a coordination polymer in an acidic medium under solvothermal conditions and in the presence of piperazine as an organic amine. In this context we report on the synthesis and crystal structure of the title compound (C4H12N2)[Cu2(C7H4NO4)2Cl4], (I)
The inorganic anion has a charge of 2 that is compensated by the incorporation of a fully protonated piperazine molecule in the structure
Summary
Research on coordination polymers, popularly known as metal–organic frameworks (MOFs), have received great attention, for their potential applications in the area of gas storage, ion-exchange, non-linear optics, molecular sieves, catalysis, magnetism, and molecular sensing (Yaghi et al, 2003; Ockwig et al, 2005; Wang et al, 2005; Carlucci et al., 2003; Hill et al, 2005), and for their rich structural chemistry (Li et al, 2016; Eddaoudi et al, 2015). Most of the reported MOF materials have been synthesized using solvothermal or hydrothermal synthetic conditions, often by using sealed autoclaves These techniques have been found to play an important role in preparing robust and stable inorganic compounds with open frameworks In the course of our investigations, we were interested in using pyridine-2,4-dicarboxylic acid as a source of N- and O-donors, in synthesizing a coordination polymer in an acidic medium under solvothermal conditions and in the presence of piperazine as an organic amine. In this context we report on the synthesis and crystal structure of the title compound (C4H12N2)[Cu2(C7H4NO4)2Cl4], (I)
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