Highly Selective Separation of CH from CO by a New Dichromate-Based Hybrid Ultramicroporous Material.

A new hybrid ultramicroporous material, [Ni(1,4-di(pyridine-2-yl)benzene)(CrO)] (DICRO-4-Ni-i), has been prepared and structurally characterized. Pure gas sorption isotherms and molecular modeling of sorbate-sorbent interactions imply strong selectivity for CH over CO (S). Dynamic gas breakthrough coupled with temperature-programmed desorption experiments were conducted on DICRO-4-Ni-i and two other porous materials reported to exhibit high S, TIFSIX-2-Cu-i and MIL-100(Fe), using a CH/CO/He (10:5:85) gas mixture.

Crystal engineering of a family of hybrid ultramicroporous materials based upon interpenetration and dichromate linkers.

A new family of 2-fold interpenetrated primitive cubic () networks of formula [M(L)(CrO)] (M = Co, Ni, Cu and Zn; L = 4,4'-azopyridine), , has been synthesised and their structures, permanent porosity and gas sorption properties were comprehensively characterised. Molecular simulations indicate that CO molecules occupy both of the two distinct ultramicropores that run through this isostructural series. The orientation of the CrO pillars is thought to contribute to high isosteric enthalpy of adsorption () towards CO and temperature programmed desorption experiments reveal that selectively adsorbs CO from gas mixtures that simulate flue gas.

Double-walled topology networks from a novel fluoride-bridged heptanuclear metal cluster.

Two isostructural metal-organic materials, ( = 2,4,6-tris(4-pyridyl)pyridine; M = Co, Ni), that exhibit binodal 3,6-connected network topology have been prepared and characterized. are based upon a novel MF cluster that possesses 12 connection points but, because of double cross-linking by 3-connected ligands, it functions as a 6-connected supermolecular building block (SBB).