Selective NO Trapping

Selective NO Trapping

Author: Veronika Belusa

To selectively capture molecules possessing an electron-acceptor character like nitric oxide, Hitoshi Miyasaka and colleagues, RIKEN Spring-8 Center, Hyogo, Japan, have synthesized one-dimensional chain compounds possessing a high donor character. They used 4-chloroanisate-bridged paddlewheel-type dimetal(II, II) complexes with M = Ru and Rh and phenazine (phz) as the chain linker: [M2(4-Cl-2-OMePhCO2)4(phz)]•n(CH2Cl2).

CH2Cl2 occupies the spaces between chains of [−{M2}−phz−] repeating units, until NO guest molecules trigger stepwise transformations with hysteresis absorption/desorption behavior: in a first gate-opening absorption step, NO is physisorpt by the gas-recognition ability of the pores. In a second gate-opening absorption step host/guest chemical interactions occur.
A charge transfer between the host [−{M2}−phz−] framework and the NO molecules plays a key role for the specific adsorption behavior. The phz unit, which is activated by a π back-donation mechanism from the [M2] units, and its near-field region, trap the NO molecules involving charge transfer.

The team thinks that the fine-tuning of the electrondonating ability of framework components is a promising strategy to achieve the advanced selective absorption properties.

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