Syntheses and Crystal Structures of Three Copper(II) Compounds with 2-Furoic Acid: A Dinuclear Paddle-wheel Unit and Two Coordination Polymers Supported by Pyridyl Donor Ligands

摘要

Three copper( II) complexes, [ Cu2( O2CC4H3O) 4( H2O) 2] center dot H2O ( 1), {[ Cu2( O2CC4H3O) 4( bipy) 2( H2O) 2] center dot 2H2O} n( 2), and {[ Cu( bpp) 2( H2O)]( O2CC4H3O) 2 center dot 7H2O} ( 3) [ O 2 CC4H3O = 2- furanocarboxylate anion, bipy = 4,4 ' - bipyridine, and bpp = 1,3- bis( 4- pyridyl) propane] were synthesized and their crystal and molecular structures were determined by single- crystal X- ray diffraction analysis. Compound 1 consists on bimetallic tetracarboxylate units exhibiting a common paddle wheel structure. The paddle wheel units are connected by hydrogen bonding along the crystallographic b axis and p- p stacking interactions between the furano rings along the crystallographic c axis, giving rise to a 2D supramolecular array. Compounds 2 and 3 were made up in the presence of 4,4 ' - bipyridine and 1,3- bis( 4- pyridyl) propane ligands, respectively, to produce 1D polymeric chains by metalligand interactions. The presence of other weak non- covalent interactions in these compounds extends the systems dimensionality to form 3D supramolecular networks.