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Nicotinamide was employed as a supramolecular reagent in the synthesis of six new copper(II) bromo-, iodo-, fluoro- and dibromobenzoate complexes. Structures of [Cu(2-Brbz) 2 (nia) 2 (H 2 O) 2 ] ( I ), [Cu(2-Ibz) 2 (nia) 2 (H 2 O) 2 ] ( II ), [Cu(2-Fbz) 2 (nia) 2 (H 2O ) 2 ] ( III ), [Cu(4-Brbz) 2 (nia) 2 (H 2 O) 2 ]( IV ), [Cu(3,5-Br2 bz) 2 (nia) 2 (H 2 O) 2 ] ( V ), [Cu(F-Fbz) 2 (nia) 2 (H 2 O)]  ·  H 2 O ( VI ) (nia = nicotinamide, 2-Brbz = 2-bromobenzoate, 4-Brbz = 4-bromobenzoate, 3,5-Br 2  bz = 3,5-dibromobenzoate, 2-Ibz = 2-iodobenzoate, 2-Fbz = 2-fluorobenzoate, 4-Fbz = 4-fluorobenzoate) were determined using X-ray analysis. Compound [Cu(2-Brbz) 2 (nia) 2 ]  ·  2H 2 O ( VII ) was prepared by a new method and also characterized by X-ray powder diffraction and EPR spectroscopy. Compounds  I – V  are monomeric complexes with a square-bipyramidal coordination sphere around the Cu 2+  ion. Complex  VI  is monomeric with coordination environment around the Cu2+ ion of a tetragonal-pyramid. Complexes  I  and  VII  present examples of coordination isomerism. Molecules of all compounds are connected by N—H· · ·O and O—H·· ·O hydrogen bonds from the NH2 groups of nicotinamide and water molecules which create supramolecular hydrogen-bonding-coordination chains and networks. · c 2015 Institute of Chemistry, Slovak Academy of Sciences

Self-assembly hydrogen-bonded supramolecular arrays from copper(II) halogenobenzoates with nicotinamide:Structure and EPR spectra ‡