A 2D metal-organic coordination polymer of Cu(II) based on tartrate ligands; synthesis, characterization, spectroscopic, crystal structure, solution studies and electrochemical behavior

A chiral 2D coordination polymer, {[Cu-2(tart)(2)(H2O)(2)]center dot E4H(2)O}(n) 1, was synthesized by the reaction of tartaric acid (tartH(2)), acridine (acr) andCu(NO3)(2) and characterized by elemental analysis, spectral (IR, UV-Vis), electrochemical and X-ray single crystal diffraction. The acridine has not been incorporated in the crystal structure. Compound 1 has infinite two-dimensional network and such 2D networks were linked by complicated O-H center dot center dot center dot O hydrogen bonds to form 3D supramolecular network. In this polymer the tartrate ligands chelate two Cu(II) atoms at opposite ends using one carboxylate oxygen atom and one hydroxyl oxygen atom therefore each Cu(II) atom is chelated by two halves of tartrate dianions. The Cu1 and Cu2 centers are coordinated by five oxygen atoms from two tartrate ligands and one oxygen atom of water molecule therefore both Cu(II) centers adopt distorted octahedral geometries. The protonation constants of tartaric acid (tart) and acridine (acr), in all of the probability protonated forms, the equilibrium constants for the tart-acr proton transfer system and the stoichiometry and stability constant of the complexation of this system with Cu2+ ion in dioxane/water (1:1 V/V) solvent were investigated by the potentiometric pH titration method. The stoichiometries of the complex species in solution were compared with the corresponding crystalline complex. (C) 2013 King Saud University. Production and hosting by Elsevier B.V.