摘要
Layered rare earth hydroxides(LREHs)are a novel class of two-dimensional materials with potential applications in various fields.The exchange reactions with organic anions are typically the first step for the functionalization of LREHs.Although the laminar structures seem to be clear for anion-exchanged compounds,the state of intercalated organic anions and their interactions with cationic rare earth hydroxide layers remain unclear.Herein,we demonstrate that the use of 13C solid-state nuclear magnetic resonance(ssNMR)spectroscopy enables to extract key information on the state of intercalated organic anions such as their local chemical environment,stacking,and dynamics,which are often difficult or impossible to obtain previously.In combination with powder X-ray diffraction and ab initio density functional theory calculations,the intercalation chemistry of two representative layered yttrium hydroxides with selected monovalent organic anions was studied in detail.The products can undergo secondary exchange with a divalent organic anion,depending on the match between the basal spacing of two phases,i.e.,the replacement of benzenesulfonate(BS^(-)),2,4-dimethylbenzene sulfonate(DMBS^(-)),and 4-ethylbenzene sulfonate(EBS)with 2,6-naphthalene disulfonate(NDS^(2-))is allowed due to the insignificant change in basal spacing after exchange,while the replacement of very long dodecyl benzene sulfonate(DBS^(-))and dodecyl sulfate(DS)with NDS^(2-)is forbidden.The results therefore provide valuable insights into the structure-property relationships of LREH-based functional materials.
基金
supported by the National Natural Science Foundation of China(grant no.21904071 and 22071115)
the Open Funds(T151904)
the State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics of China.
作者简介
Yanxin Liu,received his B.Sc.Degree from Northeast Agricultural University,China,in the year of 2020.He is currently a master candidate at the School of Materials Science and Engineering,Nankai University.His research interests are focused on layered rare earth materials and solid-state NMR spectroscopy;Shijia Jiang,received her B.Sc.Degree from Inner Mongolia University of Science and Technology,China,in the year of 2019.She is currently a master candidate at the School of Materials Science and Engineering,Nankai University.Her research interests are focused on rare earth composite oxides and solid-state NMR spectroscopy;Corresponding author:Jun Xu,received his B.Sc.Degree from Peking University,China,in the year of 2008,and his Ph.D.degree from the University of Western Ontario,Canada,in the year of 2013.After his postdoctoral research period at the University of California Berkeley(2014e2017)and ETH Zürich(2017e2018),he joined the School of Materials Science and Engineering,Nankai University,China,as an associate professor.His research interests are focused on solid-state NMR spectroscopy and rare earth materials.Tianjin Key Lab for Rare Earth Materials and Applications,School of Materials Science and Engineering&National Institute for Advanced Materials,Nankai University,Tianjin,300350,China.E-mail address:junxu@nankai.edu.cn。
