2024-03-28T16:28:19Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1209612020-06-01T12:50:28Zcom_10261_31com_10261_3col_10261_284
2015-08-04T10:24:14Z
urn:hdl:10261/120961
Single-molecule magnet behavior and magnetocaloric effect in ferromagnetically coupled LnIII-NiII-NiII-LnIII (LnIII = DyIII and GdIII) linear complexes
Meseguer, Carlos
Titos-Padilla, Silvia
Hänninen, Mikko M.
Navarrete, R.
Mota, A. J.
Evangelisti, Marco
Ruiz, José
Colacio, Enrique
Ministerio de Economía y Competitividad (España)
Junta de Andalucía
Universidad de Granada
New types of linear tetranuclear LnIII-NiII-NiII-LnIII (LnIII = Dy (1), Gd (2)) complexes have been prepared using the multidentate ligand N,N′-bis(3-methoxysalicylidene)-1,3-diaminobenzene, which has two sets of NO and OO′ coordination pockets that are able to selectively accommodate NiII and LnIII ions, respectively. The X-ray structure analysis reveals that the NiII ions are bridged by phenylenediimine groups forming a 12-membered metallacycle in the central body of the complex, whereas the LnIII ions are located at both sides of the metallacycle and linked to the NiII ions by diphenoxo bridging groups. Phenylenediimine and diphenoxo bridging groups transmit ferromagnetic exchange interactions between the two NiII ions and between the NiII and the LnIII ions, respectively. Complex 1 shows slow relaxation of the magnetization at zero field and a thermal energy barrier Ueff = 7.4 K with HDC = 1000 Oe, whereas complex 2 exhibits an S = 9 ground state and significant magnetocaloric effect (-ΔSm = 18.5 J kg-1 K-1 at T = 3 K and ΔB = 5 T). © 2014 American Chemical Society.
2015-08-04T10:24:14Z
2015-08-04T10:24:14Z
2014
2015-08-04T10:24:14Z
artículo
Inorganic Chemistry 53(22): 12092-12099 (2014)
http://hdl.handle.net/10261/120961
10.1021/ic501915j
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100006393
http://dx.doi.org/10.13039/501100011011
eng
Postprint
http://dx.doi.org/10.1021/ic501915j
Sí
openAccess
American Chemical Society