A One Dimensional 3d–4f Heterometallic Chain Based on Gd3+ Nodes and Tetranuclear {Cr4(hdpta)2} Complex Ligands: Synthesis, Structure and Magnetic Properties

Assembly reaction of 1,3-diamino-2-hydroxy-propane- N , N , N ′, N ′-tetraacetic acid (H 5 hdpta), sodium acetate and Cr 3+ ion at pH 6.7 in aqueous solution leads to the formation of Na[Cr 2 (hdpta)(Ac) 2 ] ( 1 ). Single crystal X-ray analysis show that 1 bears a 3D (4,4)-connected lon framework ba...

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Bibliographic Details
Published in:Journal of cluster science 2016-05, Vol.27 (3), p.883-894
Main Authors: Liu, Shu-Qin, Dong, Cai-Li, Zhao, He, Zhang, Hui, Ni, Jun, Liu, Xiao-Yu, Zhang, Jian-Jun
Format: Article
Language:English
Subjects:
Antiferromagnetism
Aqueous solutions
Catalysis
Chemistry
Chemistry and Materials Science
Crystal structure
Gadolinium
Inorganic Chemistry
Ligands
Magnetic properties
Nanochemistry
Nitrates
Nodes
Original Paper
Physical Chemistry
Single crystals
Sodium
Sodium acetate
Solvents
Synthesis
Trivalent chromium
X ray analysis
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Summary:Assembly reaction of 1,3-diamino-2-hydroxy-propane- N , N , N ′, N ′-tetraacetic acid (H 5 hdpta), sodium acetate and Cr 3+ ion at pH 6.7 in aqueous solution leads to the formation of Na[Cr 2 (hdpta)(Ac) 2 ] ( 1 ). Single crystal X-ray analysis show that 1 bears a 3D (4,4)-connected lon framework based on mononuclear Na + nodes and dinuclear [Cr 2 (hdpta)(Ac) 2 ] − complex ligands in which two Cr 3+ ions are chelated by one hdpta 5− and also bridged by two acetate auxiliary ligands. Further assemble of 1 with Gd 3+ ions give rise to [Gd(NO 3 ) 3 (H 2 O) 4 ][Cr 4 Gd(hdpta) 2 (OH) 4 (H 2 O) 5 ]·(NO 3 )·32H 2 O ( 2 ). The [Cr 4 Gd(hdpta) 2 (OH) 4 (H 2 O) 5 ] + cation of 2 exhibit a 1D chain structure based on [Cr 4 (hdpta) 2 (OH) 4 ] 2− complex ligands and mononuclear Gd 3+ nodes. [Cr 4 (hdpta) 2 (OH) 4 ] 2− has a tetranuclear {Cr 4 } rectangular metal skeleton. Detailed synthesis experiments indicate heating is a simple and effective way to activate the inert Cr 3+ ions to prepare oxygen-bridged Cr–Ln heterometallic compounds. Magnetic studies reveal that compound 2 shows overall antiferromagnetic interaction. Graphical Abstract Stepwise synthesis of a Cr–Na compound based on dinuclear {Cr2} unit and a Cr–Gd compound bearing tetranuclear {Cr4} unit are presented.
ISSN:1040-7278
1572-8862
DOI:10.1007/s10876-015-0958-7