Chain, Pillar, Layer, and Different Pores: AN-[(3-Carboxyphenyl)-sulfonyl]glycine Ligand as a Versatile Building Block for the Construction of Coordination Polymers

Abstract

Five novel coordination polymers containing N-[(3-carboxyphenyl)-sulfonyl]glycine (H3L), namely [Co3L2(μ2-bipy)2(H2O)6] n ·2nCH3OH·8nH2O (1), [Mn(HL)(μ2-bipy)(H2O)2] n ·nH2O (2), [Mn(HL)(μ2-bipy)(H2O)] n ·3nH2O (3), [Mn(HL)(bipy)(μ2-bipy)0.5(H2O)] n ·4nH2O (4), [Ca(H2O)4Cu2(μ2-bipy)2L2] n ·4nH2O (5) (bipy = 4,4′-bipyridine), were prepared under control by tuning the reaction conditions such as pH value, reaction temperature, and starting materials. X-ray structural analyses of 1–5 reveal their structural diversity ranging from one-dimensional (1D) (1), two-dimensional (2D) (2), and noninterpenetrating 3-D porous coordination polymers (3, 4) to a 2-fold 3D interpenetrating network (5). Compound 1 presents a 1D chain structure with alternating [CoL(H2O)]2 2− binuclear and [Co(4,4′-bipy)2(H2O)4]2+ mononuclear units along the a-axis. Polymer 2, which was formed at a comparatively lower temperature, has a 2D structure extended by a HL2− ligand and a monopillar of bipy. A higher temperature was used in the preparation of 3 and 4. In addition, 3 was synthesized also at a higher pH value. In 3, HL2− ligands link the metal ions to form 2D wavelike rectangle-grid layers which are held together through μ2-bipy molecules in a double-pillar supporting fashion to give a 3D porous framework. A decrease of the pH value led to the formation of another 3D porous framework 4, in which each Mn center binds two trans-located bipy molecules. One bipy behaves as a terminal ligand, while the other one acts as a bridging ligand extending the 2D layers into a unique 3D porous framework. When calcium hydroxide was used, it led to the construction of a 2-fold 3D interpenetrating network of 5 where the Cu atoms are joined by bipy ligands to generate a 1D zigzag chain. The thermogravimetric (TG) and powder X-ray diffraction (PXRD) measurements reveal that both 3 and 4 are stable after dehydration. All of these suggest that the ligand of H3L is a versatile building block for the construction of metal organic frameworks (MOFs).

Crystal structure of diaquabis(hydrogen 2-ethyl-4,5-imidazoledicarboxylato- N,O)cobalt(II), Co(H2O)2(C7H6N2O4)2

“…2-Ethyl-4,5-imidazoledicarboxylate acid attracted our attention because (a) it has two carboxyl groups which may be completely or partially deprotonated, inducing rich coordination modesa nd 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 [5,6]. In the title crystal structur, there are two hydrogen 2-ethyl-4,5-imidazoledicarboxylate, two water molecules and ac olbat(II) cation.…”

Crystal structure of dimethylamonium hydrogen 2-propyl-4,5- imidazoledicarboxylate, [C2H8N][C8H9N2O4]

“…Designing the solid state with molecules that encode well defined non-covalent motifs has recently become arapidly growing area of research due to their fascinating molecular and/or supramolecular structural diversity and potential applications for catalysis [3,4] and material sciences [5,6]. Among the noncovalent motifs, hydrogen bonding, metal-ligand coordination, and p-p stacking have been employed as synthetic paradigms to rational design of superstructures.…”

CRYSTAL STRUCTURE OF CATENA- DIAQUA( N - p - ACETAMIDOBENZENE- SULFONYLGLYCINATO)HOLMIUM(III)4,4'-BIPYRIDINEHEPTAHYDRATE, [HO(C10H11N2O)5S)3(H2O)2]·C10H8N2·7H2O

“…In the past few years, the design and synthesis of metal organic materials have attracted increasing attention due to their potential applications in the field of optics, electronics, catalysis and magnetism [1][2][3][4][5][6]. Metal ions can be found as isolated clusters or chains which are connected to each other by the linkers.…”