Evaluation of Metal-Organic Frameworks and Porous Polymer Networks for CO2 -Capture Applications.

This manuscript presents experimental data for 20 adsorption materials (metal-organic frameworks, porous polymer networks, and Zeolite-5A), including CO2 and N2 isotherms and heat capacities. With input from only experimental data, working capacities per energy for each material were calculated. Furthermore, by running seven different carbon-capture scenarios in which the initial flue-gas composition and process temperature was systematically changed, we present a range of performances for each material and quantify how sensitive each is to these varying parameters. The presented calculations provide researchers with a tool to investigate promising carbon-capture materials more easily and completely.

In situ solid state formation of copper(I) coordination polymers by thermal reduction of copper(II) precursor compounds: structure and reactivity of [Cu(NCS)2(pyrimidine)2]n.

Reaction of copper(II) thiocyanate with pyrimidine leads to the formation of the new ligand-rich 1:2 (1:2 = ratio metal salt to ligand) copper(II) compound [Cu(NCS)(2)(pyrimidine)(2)](n) (1). Its crystal structure was determined by X-ray single crystal investigations. It consists of linear polymeric chains, in which the Cu(2+) cations are mu-1,3 bridged by the thiocyanato anions. The pyrimidine ligands are terminal N-bonded to the Cu(2+) cations, which are overall octahedrally coordinated by two pyrimidine ligands and two N-bonded as well as two S-bonded thiocyanato anions. Magnetic measurements were preformed yielding weak net ferromagnetic interactions between adjacent Cu(2+) centers mediated by the long Cu-S distances and/or interchain effects. On heating compound 1 to approx. 160 degrees C, two thirds of the ligands are discharged, leading to a new intermediate compound, which was identified as the ligand-deficient 2:1 copper(I) compound [(CuNCS)(2)(pyrimidine)](n) by X-ray powder diffraction. Consequently, copper(II) was reduced in situ to copper(I) on heating, forming polythiocyanogen as byproduct. Elemental analysis and infrared spectroscopic investigations confirm this reaction pathway. Further investigations on other ligand-rich copper(II) thiocyanato compounds clearly show that this in situ thermal solid state reduction works in general.