title: Unprecedented hexagonal bipyramidal single-ion magnets based on metallacrowns.
abstract: Two Ln(iii) (Ln = Ce or Nd) complexes based on [15-MC-6] (MC = metallacrown) and phosphine oxide are reported for the first time with the Ln(iii) ion featuring nearly perfect hexagonal bipyramidal LnO8geometry, with pseudo-D6hsymmetry. Magnetic measurements reveal that both behave as single-ion magnets (SIMs), where the slow relaxation is dominated by the Raman mechanism.
authors: MOE Key Lab of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. jiajh3@mail.sysu.edu.cn tongml@mail.sysu.edu.cn.
authors: Quan-Wen
authors: QW
authors: Li
authors: MOE Key Lab of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. jiajh3@mail.sysu.edu.cn tongml@mail.sysu.edu.cn.
authors: Rui-Chen
authors: RC
authors: Wan
authors: MOE Key Lab of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. jiajh3@mail.sysu.edu.cn tongml@mail.sysu.edu.cn.
authors: Yan-Cong
authors: http://orcid.org/0000-0001-5047-3445
authors: YC
authors: Chen
authors: MOE Key Lab of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. jiajh3@mail.sysu.edu.cn tongml@mail.sysu.edu.cn.
authors: Jun-Liang
authors: http://orcid.org/0000-0002-5811-6300
authors: JL
authors: Liu
authors: MOE Key Lab of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. jiajh3@mail.sysu.edu.cn tongml@mail.sysu.edu.cn.
authors: Long-Fei
authors: LF
authors: Wang
authors: MOE Key Lab of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. jiajh3@mail.sysu.edu.cn tongml@mail.sysu.edu.cn.
authors: Jian-Hua
authors: JH
authors: Jia
authors: School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
authors: Nicholas F
authors: http://orcid.org/0000-0002-8604-0171
authors: NF
authors: Chilton
authors: MOE Key Lab of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China. jiajh3@mail.sysu.edu.cn tongml@mail.sysu.edu.cn.
authors: Ming-Liang
authors: http://orcid.org/0000-0003-4725-0798
authors: ML
authors: Tong