No abstract

In the title coupound, [Mn(C9H6O4)(C12H8N2)]n, the MnII ion is coordinated by two N atoms [Mn—N = 2.273 (3) and 2.305 (2) Å] from a 1,10-phenanthroline ligand and four O atoms [Mn—O = 2.112 (2)–2.343 (3) Å] from three 5-methyl­isophthalate (mip) ligands in a distorted octa­hedral geometry. Each mip dianion acts as a tetra­dentate ligand connecting three Mn ions. The crystal packing exhibits π–π inter­actions [3.599 (2)–3.755 (2) Å] between the centroids of the six-membered rings of neighbouring 1,10-phenanthroline ligands.

Source of material 4,4'-bipyridine (0.08 g, 0.5 mmol), 4-(sulfonylglycine)benzoic acid (0.12 g, 0.5 mmol), and NaOH (0.02 g, 0.5 mmol) were added to water (15 ml) in a Teflon-lined stainless steel reactor. The mixture was heated at 418 K for 2 days, and then slowly cooled down to room temperature. Colorless crystals of the title compound were obtained.

Source of material 1,2-Bis(4-pyridyl)ethylene (0.09g, 0.3 mmol), 3-(sulfonylglycine)benzoic acid (0.11 g, 0.5 mmol), and NaOH (0.02 g, 0.5 mmol) were added to water (12 ml) in aT eflon-lined stainless steel reactor. The mixture was heated at 438 Kfor 3days, and then slowly cooled down to room temperature. Colorless crystals of the title compound were obtained. Elemental analysis -found: C, 44.55 %; H, 4.98 %; N, 6.93 %; calculated for C 15H20N2O9S: C, 44.65 %; H, 4.89 %; N, 6.84 %. Experimental detailsHydrogen atoms attached to carbon atoms were first found in the difference electron density maps, and then placed in the calculated positions. The hydrogen atoms of carboxylate groups, bipyridine nitrogen atom and water molecules were found from Fourier dofference maps and then refined by riding model. The hydrogen atom of -NH-SO 2-g roup was located from difference Fourier maps and then refined freely for we can get good U eq and suitable bond lengths through refined freely DiscussionThe design and construction of metal-organic coordination polymers is of current interest in the fields of supramolecular chemistry and crystal engineering. Major reasons for this interest stem from their intriguing variety of topologies and structural diversity, such as helixes and diamondoid nets and because of their potential applications as functional materials. Amino acids are fundamental units of biomacromolecules, such as proteins and enzymes [1][2][3][4][5][6][7][8]. Moreover, N-sulfonyl-amino acids were found to reproduce the coordination behavior of peptides and their selectivity towards metal ions. Substitution of an Ar-SO 2-group on amine increase the coordination donors behavior of amino acids to three types of ON donors from carboxyl, sulfoxyl and amine respectively, which may result in different coordination modes and thus is of great interest in studying the coordination chemistry of N-sulfonyl-amino acids. Recently, the remarkable, multidentate ligand, 3-(sulfonyl-glycine)benzoic acid based on 3-(chlorosulfonyl)benzoic acid and glycine, seized our attention because (a) it has two carboxyl groups which may be completely or partially deprotonated, inducing rich coordination modes and allowing interesting structures with higher dimensions;(b) it can act not only as ahydrogen bond acceptor but also as ahydrogen bond donor, depending upon the degree of deprotonation [9,10]. The crystal structure of the title compound comprises a3 -(sulfonyl-glycine)benzoic acid molecule and ah alf 1,2-bis(4-pyridyl)ethylenem olecule per asymmetric unit. Both of the carboxylate groups of the acidare protonated. Multiple hydrogen bonds are known to cooperatively exert an influence on the control of molecular selfassembly in chemical and biological systems, and some examples of hydrogen-bonded helices have been reported. Interestingly, when viewed along [001], we found hydrogen-bonded helical chains, which are composed of free water molecules (O8 and O9, d(O···O) are 2.44(9) Å and 2.50(1) Å, respectively). There exist other intermolecular hyd...

Source of materialAn ethanol solution of 1,3-bi(4-pyridyl)propane (bpp, 0.2 mmol) was added dropwise to astirred aqueous solution (12 ml) of 5-methyl-benzene-1,3-dicarboxylic acid (0.2 mmol) at atemperature of 333 K. The reaction mixture was then filtered and the filtrate allowed to stand for about two weeks until colorless single crystals were obtained. Chemical analysis -found: C, 69.88 %; H, 5.92 %; N, 7.30 %; calculated for C 22 H 22 N 2 O 14 :C,69.83 %; H, 5.86 %; N7.40 %. DiscussionIn the field of supramolecular chemistry, great interest has been focused on the crystal engineering of coordination frameworks due to their new topologies, intriguing architectures, intertwining phenomena, and potential applications [1][2][3][4][5][6][7][8][9][10]. Studies in this field have been focused on the design and construction of novel coordination frameworks and the relationships between their structures and properties. In this context, benzenedicarboxylic acid and its derivatives (such as 1,3-benzenedicarboxylic acid, 1,4-benzenedicarboxylic acid, 5-hydroxyisophthalic acid) are widely used as building blocks to link metal ions to produce metal-organic frameworks with interesting structures and properties. Furthermore, these ligands can act as both hydrogen-bond acceptors and hydrogen-bond donors to generate supramolecular topologies. In view of this, we report the molecular assembly of 1,3-bi(4-pyridyl)propane and 5-methylisophthalic acid in order to further understand the coordination chemistry of 1,3-benzenedicarboxylic acid and its derivatives. The title crystal structure comprises a1,3-bi(4-pyridyl)propane molecule and a5 -methyl-benzene-1,3-dicarboxylic acid molecule per asymmetric unit ( figure, top). Both of the carboxylate groups of the acid are protonated. There exist intermolecular hydrogen bonds between carboxylate oxygen atoms and nitrogen atoms of bpp (d(O···N) distances: 2.6298 and 2.618(2) Å,and bond angles of ∠O−H···N are 177.9°and 175.6°, respectively). Then, an extended one-dimensional chain along [010] is formed (figure, bottom).