Coordination programming in the design of porous coordination polymers: Tuning of the electronic activity of frameworks for selective nitrogen monoxide trapping

A change of building block from [Ru₂ ^II, ^II (p-FPhCO₂)₄] to [Ru₂ ^II, ^II (4-F-2-OMe PhCO₂)₄] in a phenazine (phz)-bridged [Ru₂ ^II, ^II] chain compound led to a high selectivity toward nitrogen monoxide (NO) in the adsorption characteristics. High selectivity was observed despite the fact that electronically negative sites that enable close contact with NO molecules are not present in the pores, in contrast to [Ru₂ ^II, ^II (4-Cl-2-OMePhCO₂)₄ (phz)], which also exhibited selective NO adsorption.