Keggin based self-assembled mesoporous materials for the capture of selective guest molecules

• Published in: Materials advances Vol. 3; no. 13; pp. 5521 - 5531
• Main Authors: Tandekar, Kesar, Tripathi, Anjali, Prasad, Muvva D, Supriya, Sabbani
• Format: Journal Article
• Language: English
• Published: 04-07-2022
• ISSN: 2633-5409; 2633-5409
• DOI: 10.1039/d1ma01092a

A series of self-assembled mesoporous materials, compounds
1-9
, of the type [RPPh
3
]
n
[XM
12
O
40
] (R = Ph, Me, Et;
n
= 3 or 4; X = P, Si; M = Mo, W) composed of Keggin anions and phosphonium cations have been fabricated and characterized. These thermally stable hybrid materials show selective reversible uptake of non-polar molecules such as iodine and carbon disulfide under ambient conditions. The resultant porosity is attributed to the self-assembling of the cations on the surface of the Keggin anion such that the pores are lined with the phosphonium cations rendering them hydrophobhic. The present work explores the spontaneous self-assembly process of POM integrated mesoporous compounds stabilized
via
non-covalent interactions and their potential applications as adsorbing materials.
Keggin-based self-assembled mesoporous materials have been synthesized which show selective uptake of non-polar molecules,
e.g.
I
2
and CS
2
. The phosphonium cations play an important role in this assembly forming polyoxometalate based porous materials.