2016. 57, 6 – UDC 535.42:548.737:546.22 STUDY OF THE SUPRAMOLECULAR INTERACTIONS OF CARBOXYLIC ACIDS USED AS VERSATILE LIGANDS IN COORDINATION CHEMISTRY C.C. Corrкa1, F.M. Scaldini2, F.C. Machado2, C.B. Pinheiro1 1Departamento de Fнsica-ICEX, Universidade Federal de Minas Gerais, Belo Horizonte-MG, Brazil E-mail: cccorrea@fisica.ufmg.br 2Departamento de Quнmica-ICE, Universidade Federal de Juiz de Fora, Juiz de Fora-MG, Brazil Received June, 2, 2015 Carboxylate ligands are very versatile because they can adopt different coordination modes towards metal cations, such as monodentate, bidentate-chelate, bidentate bridging and monoatomic bridging. <...> Because of this versatility, these ligands have been widely used in coordination chemistry. <...> In this study the three dimensional structure of the crystal arrangement of 2,5thiophenedicarboxylic (H2TPD), trans-3-(3-pyridyl)acrylic (HPYA), and 4,4-sulfonyldibenzoic (H2SFD) acids are determined in order to investigate their supramolecular properties for coordination polymers and metal-organic framework (MOF) constructions. <...> INTRODUCTION In the last decade, carboxylate ligands have been widely explored in coordination chemistry, through the formation of coordination polymers (CPs) and supramolecular arrangement with different and interesting coordination modes in respect to a metallic center [ 1 ]. <...> CPs are defined as metalorganic polymers in which the repeating coordination entities, build up with metal ion centers (nodes) and organic molecules (spacers or linkers), are linked through covalent bonds [ 2 ]. <...> The supramolecular chemistry is based on hydrogen bonds, van der Waals interactions, and — interactions. <...> Multidentate carboxylate ligands that, apart from the O donor, also have N and/or S donors are candidates to form 1D, 2D, and 3D CPs through of the coordination to a metallic center [ 22 ]. <...> Due to these characteristics, 2,5-thiophenedicarboxylic acid (H2TPD), trans-3-(3-pyridyl)-acrylic acid (HPYA), and 4,4-sulfonyldibenzoic acid (H2SFD) shown in Scheme 1, have already been used in coordination chemistry [ 1, 23—27 ]. <...> H2TPD, is a multicarboxylate ligand with an S donor, generally considered to be aromatic, that obeys the 4n+2p electron rule. <...> Owing to the larger radius of sulfur compared to carbon, nitrogen, and oxygen atoms, a sulfur electron pair is easily delocalized over the heterocycle, and the ligand <...>