TY  - JOUR
AU  - Shenqian, Ma
AU  - Weixin, Zhao
AU  - Jun, Zhou
AU  - Yang-gang, Wang
AU  - Jiaou, Wang
AU  - Shengqi, Chu
AU  - Liu, Zigeng
AU  - Leyu, Wang
AU  - Guolei, Xiang
TI  - A new type of noncovalent surface–π stacking interaction occurring on peroxide-modified titania nanosheets driven by vertical π-state polarization
JO  - Chemical science
VL  - 12
IS  - 12
SN  - 2041-6539
CY  - Cambridge
PB  - RSC
M1  - FZJ-2020-04926
SP  - 4411 - 4417
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - 34163705
UR  - <Go to ISI:>//WOS:000635768300018
DO  - DOI:10.1039/D0SC06601J
UR  - https://juser.fz-juelich.de/record/888458
ER  -