Syntheses, structures and magnetic properties of three dinuclear, one-dimensional and two-dimensional dysprosium() complexes based on naphthalene diimide salicylic acid

• Published in: CrystEngComm 2024-09, Vol.26 (38), p.5461-5468
• Main Authors: Chen, Jia-Ting, Kuang, Xiao-Man, Li, You-Hong, Zhong, Yun-Jing, Zhang, Hui, Su, Jia-Yin, Chen, Wen-Bin, Dong, Wen
• Format: Article
• Language: English
• Subjects: Alternating current; Carboxyl group; Chemical synthesis; Crystallography; Diimide; Dysprosium; Ligands; Magnetic permeability; Magnetic properties; Magnets; Molecular structure; Naphthalene; Salicylic acid; Single crystals
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/d4ce00751d

Regulation of the complex structure is greatly significant for the preparation of single-molecule magnets (SMMs). In this work, a multidentate ligand of N , N ′-bis(3-carboxy-4-hydroxyphenyl)-1,4,5,8-naphthalenetetradicarboximide (H 4 NDISA) has been synthesized and reacted with dysprosium( iii ) salt. By controlling the ratio of metal ions to the ligand and reaction temperature, three new dysprosium( iii ) complexes are obtained, namely, [Dy 2 (H 2 NDISA) 3 (DMF) 3 (H 2 O) 10 ]·1.4DMF·2.6H 2 O ( 1 ), {[Dy(H 2 NDISA) 1.5 (DMF)(H 2 O) 4 ]·3DMF·4H 2 O} n ( 2 ), and {[Dy(HNDISA)(H 2 O) 2 ]·4H 2 O} n ( 3 ). Their structures are determined by single crystal X-ray diffraction. Crystallographic data demonstrate that complex 1 is a dinuclear dysprosium( iii ) complex linked by the bidentate ligand of H 4 NDISA. The intramolecular Dy( iii ) Dy( iii ) distance is 23.0861(7) Å. In complex 2 , the carboxyl group in one of the ligands adopts a μ-η 2 :η 1 bridging mode to connect two Dy( iii ) ions, resulting in a Dy( iii ) Dy( iii ) distance of 5.2611(5) Å. The other ligand adopts a tetradentate coordination mode to bridge two Dy( iii ) ions, forming an infinite one-dimensional chain structure along the c axis. Complex 3 displays a two-dimensional network structure. One carboxyl group in the ligand adopts a μ-η 1 :η 1 bridging mode growing along the c axis. Another carboxyl group in the ligand adopts a μ-η 2 :η 1 bridging mode. The shortest distance of Dy( iii ) Dy( iii ) is 4.6138(5) Å. DC and alternating current (AC) magnetic susceptibilities of complexes 1-3 were measured. AC magnetic susceptibility measurements show that complexes 1-3 exhibit frequency-dependent ac susceptibilities. Three new dysprosium( iii ) complexes with dinuclear, one-dimensional chain and two-dimensional network structures were synthesized and characterized.