Publication Date:
2014-11-11
Description:
With formate as ligand, one discrete dragonfly-like 3d–4f cluster showing beautiful pyramidal metal skeleton, [GdCu 4 (HCOO) 5 (μ 3 -OH) 4 (NO 3 ) 2 (H 2 O) 7 ](H 2 O) ( 1Gd ), was obtained by a self-assembly reaction of Gd(NO 3 ) 3 , Cu(NO 3 ) 2 , and formate ligand. The two nitrates could be treated as the “wings” of the “dragonfly”, and the formate with a free oxygen atom could be regarded as the “tail”. When using perchlorate instead of nitrate, two series of 1D compounds based on the similar pyramidal [ Ln Cu 4 ] unit, linear {[GdCu 4 (HCOO) 5 (μ 3 -[OH) 4 (H 2 O) 8 ](ClO 4 ) 2 (H 2 O) 2 } n ( 2Gd ) and zigzag {[ Ln Cu 4 Na 2 (HCOO) 4 (μ 3 -OH) 4 (H 2 O) 9 (ClO 4 ) 5 ](H 2 O) 2 } n [ Ln = Gd, ( 3Gd ); Dy, ( 3Dy )] were synthesized by controlling the formate amount. They used μ 5 -η 1 :η 4 formate or [Na 2 (ClO 4 ) 4 ] 2– unit as connectors to link the neighboring [ Ln Cu 4 ] units together, respectively. Magnetic analyses reveal that these four compounds all show ferromagnetic interactions, and 3Dy displays slow relaxation of the magnetization.
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
Permalink