Unblocking a rigid purine MOF for kinetic separation of xylenes†
Yuxiang
Wang, 
‡a
Guanghui
Zhu,
a
Sergey
Vasenkov,
b
Krista S.
Walton,
a
Simon H.
Pang
e
and
Ryan P.
Lively
*a
‡a
Guanghui
Zhu,
a
Sergey
Vasenkov,
b
Krista S.
Walton,
a
Simon H.
Pang
e
and
Ryan P.
Lively
*a
Abstract
The separation of xylene isomers still remains an industrially challenging task. Here, porous purine-based metal–organic frameworks (MOFs) have been synthesized and studied for their potential in xylene separations. In particular, Zn(purine)I showed excellent para-xylene/ortho-xylene separation capability with a diffusion selectivity of 6 and high equilibrium adsorption selectivity as indicated by coadsorption experiments. This high selectivity is attributed to the shape and size of the channel aperture within the rigid framework of Zn(purine)I.
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