Coordination polymer

About: Coordination polymer is a(n) research topic. Over the lifetime, 11988 publication(s) have been published within this topic receiving 212219 citation(s).

A chemically functionalizable nanoporous material (Cu3(TMA)2(H2O)3)n

Abstract: Although zeolites and related materials combine nanoporosity with high thermal stability, they are difficult to modify or derivatize in a systematic way. A highly porous metal coordination polymer [Cu3(TMA)2(H2O)3]n (where TMA is benzene-1,3,5-tricarboxylate) was formed in 80 percent yield. It has interconnected [Cu2(O2CR)4] units (where R is an aromatic ring), which create a three-dimensional system of channels with a pore size of 1 nanometer and an accessible porosity of about 40 percent in the solid. Unlike zeolites, the channel linings can be chemically functionalized; for example, the aqua ligands can be replaced by pyridines. Thermal gravimetric analysis and high-temperature single-crystal diffractometry indicate that the framework is stable up to 240 degreesC.

Dramatic tuning of carbon dioxide uptake via metal substitution in a coordination polymer with cylindrical pores.

Abstract: A series of four isostructural microporous coordination polymers (MCPs) differing in metal composition is demonstrated to exhibit exceptional uptake of CO2 at low pressures and ambient temperature. These conditions are particularly relevant for capture of flue gas from coal-fired power plants. A magnesium-based material is presented that is the highest surface area magnesium MCP yet reported and displays ultrahigh affinity based on heat of adsorption for CO2. This study demonstrates that physisorptive materials can achieve affinities and capacities competitive with amine sorbents while greatly reducing the energy cost associated with regeneration.

Coordination polymer networks with O- and N-donors: What they are, why and how they are made

Abstract: With this review on metal ion containing coordination polymer networks, we wish to highlight the current research in the field by giving a short overview on the concept of coordination polymers networks, how and why they are made. Several reviews on different aspects of coordination polymer compounds will be grouped and shortly presented in the introduction. Recent typical examples for different dimensionalities of the networks will be presented as well as representative compounds for specific applications. One focus will also be the problematic of polymorphism, respectively, supramolecular isomerism and pseudo-polymorphism or solvates. With a view to the large number of polymer coordination compounds that can be found in the literature, we will limit the review to the more recent results in the field and restrain the examples to the more common O-donor and mainly N-donor ligands. As our own interests lie in the field of group 11 elements, some focuses are more related with this field. The expression “Coordination Polymer” was first used by J.C. Bailar in 1967, when he compared organic polymers with inorganic compounds which can be considered as polymeric species. In comparison he established rules for the building and the required properties of new species involving metal ions and organic ligands [J.C. Bailar Jr., Prep. Inorg. React. 1 (1964) 1]. During the last 15 years the number of publications concerning coordination polymers has dramatically increased from 100 articles per year to 1000 in 2004. What really are coordination polymers? Why do these huge developments happen?

Coexistence of ferromagnetism and metallic conductivity in a molecule-based layered compound

Abstract: Crystal engineering--the planning and construction of crystalline supramolecular architectures from modular building blocks--permits the rational design of functional molecular materials that exhibit technologically useful behaviour such as conductivity and superconductivity, ferromagnetism and nonlinear optical properties. Because the presence of two cooperative properties in the same crystal lattice might result in new physical phenomena and novel applications, a particularly attractive goal is the design of molecular materials with two properties that are difficult or impossible to combine in a conventional inorganic solid with a continuous lattice. A promising strategy for creating this type of 'bi-functionality' targets hybrid organic/inorganic crystals comprising two functional sub-lattices exhibiting distinct properties. In this way, the organic pi-electron donor bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) and its derivatives, which form the basis of most known molecular conductors and superconductors, have been combined with molecular magnetic anions, yielding predominantly materials with conventional semiconducting or conducting properties, but also systems that are both superconducting and paramagnetic. But interesting bulk magnetic properties fail to develop, owing to the discrete nature of the inorganic anions. Another strategy for achieving cooperative magnetism involves insertion of functional bulky cations into a polymeric magnetic anion, such as the bimetallic oxalato complex [MnIICrIII(C2O4)3]-, but only insoluble powders have been obtained in most cases. Here we report the synthesis of single crystals formed by infinite sheets of this magnetic coordination polymer interleaved with layers of conducting BEDT-TTF cations, and show that this molecule-based compound displays ferromagnetism and metallic conductivity.