Abstract
A one-dimensional nickel(II) coordination polymer with the mixed ligands 6-fluoro-nicotinate (6-Fnic) and 4,4'-bi-pyridine (4,4'-bpy), namely, catena-poly[[di-aqua-bis-(6-fluoro-pyridine-3-carboxyl-ato-κO)nickel(II)]-μ-4,4'-bi-pyri-dine-κ2 N:N'] trihydrate], {[Ni(6-Fnic)2(4,4'-bpy)(H2O)2]·3H2O} n , (1), was prepared by the reaction of nickel(II) sulfate hepta-hydrate, 6-fluoro-nicotinic acid (C6H4FNO2) and 4,4'-bi-pyridine (C10H8N2) in a mixture of water and ethanol. The nickel(II) ion in 1 is octa-hedrally coordinated by the O atoms of two water mol-ecules, two O atoms from O-monodentate 6-fluoro-nicotinate ligands and two N atoms from bridging 4,4'-bi-pyridine ligands, forming a trans isomer. The bridging 4,4'-bi-pyridine ligands connect symmetry-related nickel(II) ions into infinite one-dimensional polymeric chains running in the [10] direction. In the extended structure of 1, the polymeric chains and lattice water mol-ecules are connected into a three-dimensional hydrogen-bonded network via strong O-H⋯O and O-H⋯N hydrogen bonds, leading to the formation of distinct hydrogen-bond ring motifs: octa-meric R 8 8(24) and hexa-meric R 8 6(16) loops.
Highlights
A one-dimensional nickel(II) coordination polymer with the mixed ligands 6-fluoronicotinate (6-Fnic) and 4,40-bipyridine (4,40-bpy), namely, catenapoly[[diaquabis(6-fluoropyridine-3-carboxylato-O)nickel(II)]--4,40-bipyridine-2N:N0] trihydrate], {[Ni(6-Fnic)2(4,40-bpy)(H2O)2]Á3H2O}n, (1), was prepared by the reaction of nickel(II) sulfate heptahydrate, 6-fluoronicotinic acid (C6H4FNO2) and 4,40-bipyridine (C10H8N2) in a mixture of water and ethanol
The multifunctionality of the organic ligands used as building blocks in the assembly of coordination polymers is reflected in the position and coordination ability of their donor atoms and/or groups and is the main factor in the design of unusual and unexpected architectures with novel topologies and properties
We report the synthesis and characterization of the first metal complex with 6-fluoronicotinate – the onedimensional nickel(II) coordination polymer {[Ni(6-Fnic)2(4,40-bpy)(H2O)2]Á3H2O} (1)
Summary
The design of coordination polymers relies on the concepts of crystal engineering (Desiraju, 2007, 2013) and has become a prominent field of research in recent years for many reasons including the functional properties shown by coordination polymers, their aesthetics and many possible applications such as catalysis, gas storage and separation, magnetism, luminescence and molecular sensing (Mueller et al, 2006; Bosch et al, 2017; Zhang et al, 2015; Zeng et al, 2014, 2016; Douvali et al, 2015; Xu et al, 2017; Zhou et al, 2017). The main challenge is to control the formation of a coordination polymer with the desired molecular and crystal structure, which is affected by the experimental conditions such as the choice of solvents, starting metal salts, additional ligands, temperature, hydrothermal conditions, pH value (Li et al, 2016; Zhou et al, 2016; Gu et al, 2016). Fluorine-substituted aromatic carboxylic acids are good candidates for the design of functional coordination polymers showing higher thermal stability as well as stability towards oxidation (Peikert et al, 2015; Yuan et al, 2016). We report the synthesis and characterization of the first metal complex with 6-fluoronicotinate – the onedimensional nickel(II) coordination polymer {[Ni(6-Fnic)2(4,40-bpy)(H2O)2]Á3H2O} (1). We wanted to explore the effect of the probable weak intermolecular interactions involving the aromatic F atoms (for example C—HÁ Á ÁF interactions) on the assembly of the polymeric chains in the crystal packing
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