Coordination polymer

About: Coordination polymer is a research topic. Over the lifetime, 11988 publications have been published within this topic receiving 212219 citations.

One‐Pot Synthesis of Silica@Coordination Polymer Core–Shell Microspheres with Controlled Shell Thickness

Abstract: Coordination polymers have received much attention due to their unique applications, such as gas storage, [ 1 ] catalysis, [ 2 ] separation, [ 3 ] and optics. [ 4 ] In addition to the typical macroscaled crystalline coordination polymer materials, microand nanoscaled crystalline or amorphous coordination polymer particles (CPPs) have been recently developed by several research groups. [ 5–8 ] CPPs are now being developed into a new branch of colloidal materials with unique applications in gas storage materials, [ 6 ] heterogeneous catalysts, [ 7 ] and imaging probes. [ 8 ] Meanwhile, the merger of coordination polymers with other solid materials can extend the scope of the utilization of these materials, however, the conjunction of coordination polymers to other solid materials to produce hybrid materials is barely studied. [ 9–11 ] Seed coating and chemical modifi cation of the support surface are general useful methods for directing the initiation and growth of coordination polymers on the surface of solid materials because the heterogeneous growth of coordination polymers on the support surface is usually poor. [ 10 ] Usually a carboxylate-terminated surface induces a regular growth of coordination polymers. [ 11 , 12 ] Here we present a novel advance in the technical use of coordination polymers for the preparation of core–shell structures. We fi nd that coordination polymerization of organic building blocks and metal nodes can be initiated on carboxylate-terminated silica particles to produce unique silica@coordination polymer core–shell microspheres. Silica particles are often used in the construction of core-shell structures due to their optical transparency, easy of production with narrow size distribution, and low cost. [ 13 ] Furthermore, we also demonstrate that the shell thickness in core–shell structures can be judiciously controlled by adjusting the amount of reactants, including coordination polymer precursors and silica particles. In a typical synthesis, silica@coordination polymer core– shell microspheres were prepared by the following process ( Scheme 1 ): Carboxylate-terminated silica particles with a diameter of 0.99 μ m were added to a N,N -dimethylformamide (DMF) solution of coordination polymer precursors, which contained metal nodes, In(NO 3 ) 3 , and the organic building blocks isophthalic acid (H 2 IPA). [ 14 ] Carboxylate groups on the silica surface interact with In 3 + and initiate the growth of coordination polymers. [ 11 ] This interaction should induce a regular growth of

A Tetracarboxylate-Bridged Dicopper(II) Paddle-Wheel-Based 2-D Porous Coordination Polymer with Gas Sorption Properties

Abstract: The synthesis, crystal structure, and sorption properties of [Cu2(bdc)2(dmf)]H2O·(dmf)(C2H5OH)0.5 (2·g, g = dmf·H2O·(C2H5OH)0.5, bdc = 1,3-benzenedicarboxylate, dmf = N,N‘-dimethylformamide) are reported. 2·g features upended bowl cavities with an outer diameter of 9.4 A, which are enclosed by four tetracarboxylate-bridged Cu2 paddle-wheels and extended by dicarboxylate linkers into a two-dimensional (2-D) coordination polymer. The metal−organic layers are further stacked in a slipped manner through van der Waals interactions to generate a three-dimensional (3-D) supramolecular structure having 2-D channels that accommodate the solvent molecules. After removal of the solvent molecules, solid 2 exhibits permanent porosity verified by an N2 sorption isotherm with a Langmuir surface area of 629 m2·g-1 and Brunauer−Emmett−Teller (BET) surface area of 374 m2·g-1. Moreover, solid 2 also displays interesting methanol and benzene vapor sorption behaviors with large hysteresis and incomplete desorption, which is a...

Polynuclear Lanthanide Hydroxo Complexes : New Chemical Precursors for Coordination Polymers

Abstract: The synthesis of hexanuclear lanthanide hydroxo complexes by controlled hydrolysis led to polymorphic compounds. The hexanuclear entities crystallize in four different ways that depend on the extent of their hydration. The four structures can be described as hexanuclear lanthanide entities with formula [Ln(6)(mu(6)-O)(mu(3)-OH)(8)(NO(3))(6)(H(2)O)(12)](2+). Two additional NO(3)(-) ions intercalate between the hexanuclear entities in order to ensure the electroneutrality of the crystal structure. Some crystallization water molecules fill the intermolecular space. The three first families of compounds (1-3) exhibit crystal structures that have previously been reported. The fourth family of compounds (4) is described here for the first time. Its chemical formula is [Ln(6)(mu(6)-O)(mu(3)-OH)(8)(NO(3))(6)(H(2)O)(12)](NO(3))(2).2H(2)O (Ln = Gd, Er, and Y). In this paper, the chemical and thermal stabilities of the hexanuclear lanthanide compounds are reported together with the magnetic properties of the Gd(III)-containing species. To use these entities as precursors for new materials, the substitution of the nitrato groups by chloride ions has been studied. Two byproduct compounds have so been obtained: The first (compound 5) is a nitrato/chloride hexanuclear compound of chemical formula [Er(6)(mu(6)-O)(mu(3)-OH)(8)(NO(3))(6)(H(2)O)(12)](NO(3))Cl.2H(2)O. The second one (compound 6) is a polymeric compound in which the hexanuclear entities are linked by an unexpected and original N(2)O(4) bridge. Its chemical formula is [Er(6)(mu(6)-O)(mu(3)-OH)(8)(NO(3))(4)(H(2)O)(11)(OH)(ONONO(2))]Cl(3).2H(2)O. Its crystal structure can be described as the juxtaposition of chainlike molecular motifs. To the best of our knowledge, this is the first example of a coordination polymer synthesized from an isolated polylanthanide hydroxo complex.

Crystal-to-Crystal Transformation from a Weak Hydrogen-Bonded Two-Dimensional Network Structure to a Two-Dimensional Coordination Polymer on Heating

Abstract: Single crystal to single crystal transformation of a new mercury(II) coordination polymer with ligand 1,4-bis(2-pyridyl)-2,3-diaza-1,3-butadiene (bpdb), [Hg2(µ-bpdb)I4] (1α) to [Hg2(µ-bpdb)(µ-I)2I2]n (1β), has been reported and structures of 1α and 1β were determined by X-ray crystallography. The thermal stability of compounds 1α and 1βwere studied by thermal gravimetric (TG) and differential thermal analyses (DTA). Powder X-ray diffraction experiments showed that the phase transitions described for single crystals also occur in macroscopic powder samples and lead to monophasic products and the crystal-to-crystal transformation described is not reversible.