In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2005, No. 8 ( 2005-04), p. 1500-1505
Kurzfassung:
Two Schiff base compartmental ligands, H 2 L 1 and H 2 L 2 , derived from the condensation of 3‐ethoxysalicylaldehyde with 1,2‐diaminocyclohexane and orthophenylenediamine, respectively, have been utilized to isolate two diphenoxo‐bridged discrete dinuclear Cu II Gd III complexes, [Cu II (H 2 O)L 1 Gd III (NO 3 ) 3 ] ( 3 ) and [Cu II L 2 Gd III (NO 3 ) 3 ] ( 4 ). This is the first report on the 3d‐4f compounds derived from compartmental Schiff base ligands with cyclic diamines. The compounds 3 and 4 crystallize in the triclinic P and orthorhombic Pna 2(1) space groups, respectively, with the following unit cell parameters – 3 : a = 8.8713(2) Å, b = 12.8399(3) Å, c = 14.0067(3) Å, α = 80.6649(5)°, β = 77.4059(5)°, γ = 76.8879(5)°, and Z = 2; 4 : a = 9.2210(1) Å, b = 16.5407(2) Å, c = 19.9248(4) Å, and Z = 4. Structural analysis reveals that both are discrete dinuclear complexes. In 3 , one water molecule is coordinated to the copper( II ) ion to result in a square‐pyramidal coordination geometry, while the geometry of the coppe( II ) center in 4 is square planar. In both complexes, the gadolinium( III ) center has an O 10 coordination environment. In contrast to expectation, although the N 2 O 2 cavity affords a better planar environment for the copper( II ) center in 4 , the bridging moiety in complex 3 is more planar than that in 4 or in most of the previously reported examples (the dihedral angle between two CuO 2 Gd planes: 2.1° for 3 and 7.1° for 4 ). Variable‐temperature and variable‐field magnetic measurements reveal that the metal centers in both the complexes are ferromagnetically coupled ( J values: 6.3 cm –1 for 3 and 5.4 cm –1 for 4 ; H = –2 JS Cu · S Gd ). Interestingly, complex 3 exhibits strongest ferromagnetic interaction among the related compounds. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Materialart:
Online-Ressource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2005:8
DOI:
10.1002/ejic.200400858
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2005
ZDB Id:
1475009-0
