%0 Journal Article
%A Shenqian, Ma
%A Weixin, Zhao
%A Jun, Zhou
%A Yang-gang, Wang
%A Jiaou, Wang
%A Shengqi, Chu
%A Liu, Zigeng
%A Leyu, Wang
%A Guolei, Xiang
%T A new type of noncovalent surface–π stacking interaction occurring on peroxide-modified titania nanosheets driven by vertical π-state polarization
%J Chemical science
%V 12
%N 12
%@ 2041-6539
%C Cambridge
%I RSC
%M FZJ-2020-04926
%P 4411 - 4417
%D 2021
%X Noncovalent π stacking of aromatic molecules is a universal form of noncovalent interactions normally occurring on planar structures (such as aromatic molecules and graphene) based on sp2-hybridized atoms. Here we reveal a new type of noncovalent surface–π stacking unusually occurring between aromatic groups and peroxide-modified titania (PMT) nanosheets, which can drive versatile aromatic adsorptions. We experimentally explore the underlying electronic-level origin by probing the perturbed changes of unoccupied Ti 3d states with near-edge X-ray absorption fine structures (NEXAFS), and find that aromatic groups can vertically attract π electrons in the surface peroxo-Ti states and increase their delocalization regions. Our discovery updates the concept of noncovalent π-stacking interactions by extending the substrates from carbon-based structures to a transition metal oxide, and presents an approach to exploit the surface chemistry of nanomaterials based on noncovalent interactions.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 34163705
%U <Go to ISI:>//WOS:000635768300018
%R 10.1039/D0SC06601J
%U https://juser.fz-juelich.de/record/888458