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Synthesis, Structure, and Magnetic Properties of a Family of Heterometallic Pentanuclear [Co 4 Ln] (Ln = Gd III , Dy III , Tb III , and Ho III ) Assemblies
Author(s) -
Chandrasekhar Vadapalli,
Das Sourav,
Dey Atanu,
Hossain Sakiat,
Lloret Francesc,
Pardo Emilio
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201300413
Subject(s) - chemistry , lanthanide , crystallography , antiferromagnetism , ion , octahedron , magnetic susceptibility , stereochemistry , inorganic chemistry , crystal structure , physics , organic chemistry , condensed matter physics
Abstract The reaction of 6‐formyl‐2‐(hydroxymethyl)‐4‐methylphenol (LH 2 ) with appropriate lanthanide salts followed by reaction with Co(OAc) 2 · 4H 2 O afforded the pentanuclear heterobimetalllic compounds [Co 4 Ln(L) 4 (OAc) 2 (S) 4 ](NO 3 )(S) [Ln III = Gd III , S = MeOH ( 1 ); Ln III = Dy III , S = H 2 O ( 2 ); Ln III = Tb III , S = MeOH ( 3 ); Ln III = Ho III , S = MeOH ( 4 )] in good yields. All the compounds are stable in solution as confirmed by ESI‐MS studies. These complexes contain a distorted Co 4 tetrahedral core, which encapsulates a central lanthanide ion. The Co II and Ln III ions are in an all‐oxygen environments. All the Co II ions possess a distorted octahedral geometry, and the Ln III ions are in a distorted square‐antiprismatic geometry. The magnetic properties of 1 – 4 have been investigated in the temperature range 2–300 K. In addition, the magnetic properties of 1 were fitted by using a Hamiltonian of the type H = H SO + H axial + H exchange + H Zeeman . A moderately strong antiferromagnetic interaction between the nearest‐neighbour Co II ions was found, whereas the magnetic interaction between the Co II ions and the corresponding Ln III ions is negligible.