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Magnetic and Structural Studies of Copper–Lanthanoid Complexes; the Synthesis and Structures of New Cu 3 Ln Complexes of 6‐chloro‐2‐Pyridone (Ln = Gd, Dy and Er) and Magnetic Studies on Cu 2 Gd 2 , Cu 4 Gd 2 and Cu 3 Gd Complexes
Author(s) -
Benelli Cristiano,
Blake Alexander J.,
Milne Paul E. Y.,
Rawson Jeremy M.,
Winpenny Richard E. P.
Publication year - 1995
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.19950010908
Subject(s) - lanthanide , chemistry , copper , crystallography , metal , crystal structure , methanol , inorganic chemistry , ion , block (permutation group theory) , geometry , organic chemistry , mathematics
The synthesis and structural characterisation of three copper–lanthanoid complexes are reported. The compounds, of general formula [Cu 3 M(chp) 8 (NO 3 )(S)] [M = Gd, S = H 2 O in 2 ; M = Dy, S = H 2 O in 3 ; M = Er, S = (H 2 O) 0.5 (MeOH) 0.5 in 4 ; chp = anion of 6‐chloro‐2‐pyridone], are made by reaction of [Cu 2 (chp) 4 ] ( 1 ) with the hydrated lanthanoid nitrate salt in methanol. Structural studies reveal the three copper atoms lie in an approximate hemisphere about a central lanthanoid atom. Magnetic studies on 2 and two further Cu–Gd complexes show ferromagnetic coupling between the 3d and 4f metals. Consideration of these results along with magnetic data previously reported for Cu–Gd compounds leads to a correlation between the magnitude of this exchange coupling and the exponential of the Cu…Gd distance. This is the first magneto‐structural correlation reported for mixed d‐block/f‐block metal complexes.