Chiral Erbium(III) Complexes: Single-Molecule Magnet Behavior, Chirality, and Nuclearity Control

Min Feng; Bang-Heng Lyu; Ming-Hui Wang; Wei-Wei Wu; Yan-Cong Chen; Guo-Zhang Huang; Wei-Quan Lin; Si-Guo Wu; Jun-Liang Liu; Ming-Liang Tong

doi:10.1021/acs.inorgchem.9b00616

Chiral Erbium(III) Complexes: Single-Molecule Magnet Behavior, Chirality, and Nuclearity Control

Inorg Chem. 2019 Aug 19;58(16):10694-10703. doi: 10.1021/acs.inorgchem.9b00616. Epub 2019 Aug 7.

Authors

Affiliations

¹ Key Laboratory of Bioinorganic and Synthetic Chemistry of the Ministry of Education, School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , P. R. China.
² School of Chemistry and Chemical Engineering , Guangzhou University , Guangzhou 510006 , P. R. China.

PMID: 31390195
DOI: 10.1021/acs.inorgchem.9b00616

Abstract

The reactions of chiral ligand (R)/(S)-1,1'-binaphthyl-2,2'-diyl phosphate (R-HL/S-HL) and ErCl₃·6H₂O afford two pairs of di- and tetranuclear enantiomers [Er₂(R/S-L)₄(EtOH)₆]Cl₂·6.5EtOH (R-1, S-1) and [Er₄(PO₄)(R/S-L)₈(EtOH)₃(H₂O)]₂Cl(OH)·15EtOH·11H₂O (R-2, S-2). The nuclearity of these complexes is controllable and depends on the reaction temperature with a template effect. Their chirality was evidenced by circular dichroism (CD) spectra. R-1 exhibits two magnetic relaxation pathways under a zero field, with an apparent barrier of 40 K. Ab initio calculations revealed a ferromagnetic dipolar interaction between these two Er(III) ions, the equatorial nature of the ligand field, and the probable origin of the two relaxations.