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Manganese(II) complexes of 3,6,9-trioxaundecanedioic acid (3,6,9-tddaH2): X-ray crystal structures of [Mn(3,6,9-tdda) (H2O)2]·2H2O and {[Mn(3,6,9-tdda)(phen)2·3H2O]·EtOH}n |
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| Authors: | Sebastian McCann Malachy McCann Michael T. Casey Rev. Michael Devereux Vickie McKee Peter McMichael andJasper G. McCrea |
| Affiliation: | a Chemistry Department, St. Patrick's College, Maynooth, Co., Kildare, Ireland b Dublin Institute of Technology, Cathal Brugha Street, Dublin, Ireland c School of Chemistry, Queen's University Belfast, N. Ireland BT9 5AG |
| Abstract: | 3,6,9-trioxaundecanedioic acid (3,6,9-tddaH2) reacts with Mn(CH3CO2)2·4H2O in ethanol to give [Mn(3,6,9-tdda)]·H2O (1). Recrystallization of 1 from methanol gives crystals of [Mn(3,6,9-tdda) (H2O)2]·2H2O (2). Complex 1 reacts with an ethanolic solution of 1,10-phenanthroline (phen) to give {[Mn(3,6,9-tdda)(phen)2]·3H2O·EtOH}n (3). All of the complexes are extremely water soluble. Complexes 2 and 3 were structurally characterised. The manganese(II) ion in 2 is seven coordinate, with an approximately pentagonal bipyramidal O7 coordination sphere. The axial donors are water molecules and the pentagonal plane is occupied by the diacid, acting as a pentadentate ligand through the three ethereal oxygens and one oxygen atom from each of the carboxylate functions. In complex 3 the manganese(II) ion is six-coordinate, being bound to two bidentate phenanthroline ligands and to the carboxylate oxygen atoms from two symmetry related diacids which are coordinated in a cis fashion. The structure consists of polymeric chains, with diacid ligands bridging the manganese ions. There is π-π stacking of pairs of phenanthroline ligands on adjacent chains, running along both the z and y directions. |
| Keywords: | 3,6,9-trioxaundecanedioic acid manganese phenanthroline X-ray dicarboxylic acid π-π stacking |
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